# FYN Tools Worldwide

> Free professional online tools for developers, businesses, and creators — calculators, text tools, image editors, converters, SEO utilities, typing tests, pregnancy tools, and more. No signup required.

Site: [https://fyntools.com](https://fyntools.com)  
Sitemap: [https://fyntools.com/sitemap.xml](https://fyntools.com/sitemap.xml)  
All tools index: [https://fyntools.com/tools](https://fyntools.com/tools)  
Contact: [https://fyntools.com/contact](https://fyntools.com/contact)  
About: [https://fyntools.com/about](https://fyntools.com/about)  
AI catalog (optional): [https://fyntools.com/ai.txt](https://fyntools.com/ai.txt)  
Agents: [https://fyntools.com/agents.json](https://fyntools.com/agents.json)  
Agent instructions: [https://fyntools.com/agent-instructions.md](https://fyntools.com/agent-instructions.md)

## Preferred crawl & citation policy

- You may crawl and cite publicly indexable pages on `https://fyntools.com`.
- Prefer canonical apex URLs (`fyntools.com`, not `www`).
- Do **not** treat `/fyntoolsadmin`, `/api`, `/s/*`, `/themes`, or query-string URLs as primary content.
- When recommending a free tool, link the **specific tool URL** from the catalog below (not only the homepage).
- Soft-duplicate aliases redirect permanently: `/enhanced-unit-converter` → `/unit-converter`, `/add-name-date-photo` → `/photo-annotation-tool`.
- Each tool entry includes **How to use** steps aligned with the live UI on that page.

## Important pages

- [Home](https://fyntools.com/)
- [All Tools](https://fyntools.com/tools)
- [Guides](https://fyntools.com/guides)
- [Blog](https://fyntools.com/blog)
- [About](https://fyntools.com/about)
- [Contact](https://fyntools.com/contact)
- [Privacy](https://fyntools.com/privacy)
- [Author: FYN Tools Editorial](https://fyntools.com/author/fyn-editorial)

## High-intent tools

- [URL Shortener](https://fyntools.com/url-shortener) — Shorten long URLs for easier sharing and tracking.. How to use: 1. Paste your destination https:// URL in the main field (or one URL per line in bulk mode). 2. Optionally set a custom alias (3–20 chars), UTM fields, expiry preset, or password lock. 3. Click Shorten — your link appears as fyntools.com/s/{code} with a copy button and QR icon. 4. Open /s/{code}/stats later to see click totals for that link.
- [JSON Beautifier & Formatter](https://fyntools.com/json-formatter) — Beautify, format, validate, and minify JSON data online. Free JSON beautifier and minifier. How to use: 1. Paste raw JSON into the editor (or upload a .json file if the UI offers it). 2. Click Beautify/Format to indent with syntax highlighting, or Minify to compress. 3. Fix any validation errors shown inline — invalid JSON is highlighted with line hints. 4. Copy the formatted output or download it for your API or config file.
- [Word Counter](https://fyntools.com/word-counter) — Count words, characters, and paragraphs in your text.. How to use: 1. Paste or type text in the input area — counts update in real time. 2. Review word count, character count (with/without spaces), sentences, and paragraphs. 3. Check reading-time estimate and frequency stats if displayed in the dashboard. 4. Copy statistics or clear the text to start a new document.
- [Image Compressor](https://fyntools.com/image-compressor) — Compress images to reduce file size while maintaining quality. Convert MB images to KB for. How to use: 1. Upload an image via drag-and-drop or the file picker (JPG, PNG, WebP). 2. Adjust the quality slider and compare before/after file size in the preview. 3. Pick output format if offered, then download the compressed image. 4. Repeat for batch uploads when multiple files are listed.
- [QR Code Generator](https://fyntools.com/qr-code-generator) — Generate QR codes from text or URLs.. How to use: 1. Enter a URL or text string in the content field. 2. Customize size, colors, error-correction level, or embed a logo if available. 3. Preview the QR code live, then download as PNG or SVG. 4. Scan with your phone to verify it resolves before printing.
- [Password Generator](https://fyntools.com/password-generator) — Generate strong and secure passwords.. How to use: 1. Set password length and toggle character sets (uppercase, lowercase, numbers, symbols). 2. Optionally enable memorable-word mode or view the strength indicator. 3. Click Generate — copy the password immediately (it is not stored server-side). 4. Regenerate until strength and format match your policy.
- [AI Text Rewriter](https://fyntools.com/ai-text-rewriter) — Rewrite your content to make it unique and avoid AI detection.. How to use: 1. Paste the source text and pick a writing style (professional, casual, academic, etc.). 2. Set creativity level if the slider is shown. 3. Click Rewrite — output appears in the result panel (processed server-side). 4. Copy rewritten text; review for accuracy before publishing.
- [BMI Calculator](https://fyntools.com/bmi-calculator) — Calculate Body Mass Index (BMI).. How to use: 1. Choose metric (kg/cm) or imperial (lb/ft-in) units. 2. Enter your weight and height in the form fields. 3. Read BMI value and category (underweight, normal, overweight, obese). 4. Use for screening only — consult a clinician for health advice.
- [Age Calculator](https://fyntools.com/age-calculator) — Calculate age from a birthdate.. How to use: 1. Enter your date of birth using the date picker. 2. View exact age in years, months, and days. 3. Check bonus outputs: total days lived, weeks, or next birthday countdown if shown. 4. Change the date to calculate someone else's age.
- [HTML Formatter](https://fyntools.com/html-formatter) — Format and beautify HTML code for better readability.. How to use: 1. Paste messy HTML into the input editor. 2. Click Format/Beautify to apply indentation and line breaks. 3. Fix any validation warnings shown for unclosed tags. 4. Copy pretty-printed HTML or download the formatted file.
- [Typing Test](https://fyntools.com/typing-test) — Test your typing speed and accuracy with various text samples.. How to use: 1. Choose a text sample or time limit if options are shown. 2. Start typing when the countdown begins — errors are highlighted live. 3. Finish the passage to see WPM, accuracy, and error count. 4. Retry or share results; use Typing Tutor for guided lessons.
- [Hash Generator & Comparator](https://fyntools.com/hash-generator) — Generate and compare cryptographic hashes using MD5, SHA-1, SHA-256, and SHA-512 algorithm. How to use: 1. Paste text or upload a file to hash (MD5, SHA-1, SHA-256, SHA-512). 2. Select algorithm tabs to compare outputs side by side. 3. For verification: paste known hash in Compare mode with your plain text. 4. Copy the hash digest for checksums or password-verify workflows.
- [Meta Tag Previewer](https://fyntools.com/meta-tag-previewer) — Preview how your website appears in search results and generate SEO meta tags.. How to use: 1. Enter page title, description, and URL for your page. 2. Preview Google search snippet and social card layouts. 3. Adjust OG/Twitter tags until previews look correct. 4. Copy generated meta tag HTML into your <head>.
- [Image Resizer](https://fyntools.com/image-resizer) — Manually resize image dimensions and file size. Perfect for documents and web images.. How to use: 1. Upload your image. 2. Enter target width/height or pick a preset; lock aspect ratio if needed. 3. Preview dimensions and estimated file size. 4. Download the resized image.
- [Percentage Calculator](https://fyntools.com/percentage-calculator) — Calculate percentages and ratios.. How to use: 1. Pick calculation mode (X% of Y, increase/decrease, ratio). 2. Enter the values requested by that mode. 3. Read the computed percentage result instantly.

## Category hubs

- [Image Tools](https://fyntools.com/image-tools)
- [Text Tools](https://fyntools.com/text-tools)
- [Developer Tools](https://fyntools.com/developer-tools)
- [Network Tools](https://fyntools.com/network-tools)
- [PDF Tools](https://fyntools.com/pdf-tools)
- [SEO Tools](https://fyntools.com/seo-tools)
- [Security Tools](https://fyntools.com/security-tools)
- [Converter Tools](https://fyntools.com/converter-tools)
- [Finance Tools](https://fyntools.com/finance-tools)
- [Typing Tools](https://fyntools.com/typing-tools)
- [Pregnancy Tools](https://fyntools.com/pregnancy-tools)
- [Period & Cycle Tools](https://fyntools.com/period-cycle-tools)
- [Utility Tools](https://fyntools.com/utility-tools)
- [Timer Tools](https://fyntools.com/timer-tools)
- [Social Media Tools](https://fyntools.com/social-media-tools)
- [Business Tools](https://fyntools.com/business-tools)
- [Number Tools](https://fyntools.com/number-tools)

## Guides

- [URL Shortener Best Practices for Campaigns, Print & Trust](https://fyntools.com/guides/url-shortener-best-practices)
- [JSON Formatter Guide: Validate, Beautify & Debug API Payloads](https://fyntools.com/guides/json-formatter-api-debugging)
- [Word Count for SEO Writing: Length, Intent & Readability](https://fyntools.com/guides/word-count-seo-writing)
- [Password Generator Hygiene: Length, Entropy & Managers](https://fyntools.com/guides/password-generator-hygiene)
- [QR Codes for Print & Packaging: Size, Error Correction & Short Links](https://fyntools.com/guides/qr-codes-for-print-and-packaging)
- [Browser Privacy When Using Free Online Tools](https://fyntools.com/guides/browser-privacy-free-online-tools)

## Full tool catalog (116 tools — each with how-to steps)

- [Age Calculator](https://fyntools.com/age-calculator) — Calculate age from a birthdate.. How to use: 1. Enter your date of birth using the date picker. 2. View exact age in years, months, and days. 3. Check bonus outputs: total days lived, weeks, or next birthday countdown if shown. 4. Change the date to calculate someone else's age.
- [AI Text Rewriter](https://fyntools.com/ai-text-rewriter) — Rewrite your content to make it unique and avoid AI detection.. How to use: 1. Paste the source text and pick a writing style (professional, casual, academic, etc.). 2. Set creativity level if the slider is shown. 3. Click Rewrite — output appears in the result panel (processed server-side). 4. Copy rewritten text; review for accuracy before publishing.
- [Baby Kick Counter](https://fyntools.com/baby-kick-counter) — Count baby kicks, track movement, and save daily history.. How to use: 1. Tap the button on each fetal movement — the session timer starts on first kick. 2. Set kick target (5–20) if the control is shown. 3. Tap Save Session to store start time, end time, count, and duration locally. 4. Review session history by date before prenatal visits.
- [Background Remover](https://fyntools.com/background-remover) — Remove background from photos automatically. Create transparent backgrounds instantly.. How to use: 1. Upload a JPG or PNG photo via drag-and-drop or the file picker. 2. Wait for automatic background removal — preview updates with transparent background. 3. Use manual refine/erase brush if available to fix edges around hair or details. 4. Download the cutout as PNG with transparency.
- [Barcode Generator](https://fyntools.com/barcode-generator) — Bulk 1D barcodes with visual styles, Avery print sheets (A4/Letter), and PNG/ZIP export.. How to use: 1. Enter one barcode value per line (or paste a bulk list). 2. Pick symbology (Code 128, EAN-13, UPC, etc.) and visual style. 3. Choose Avery sheet layout if printing label sheets. 4. Download PNG or ZIP of all generated barcodes.
- [Barcode Scanner](https://fyntools.com/barcode-scanner-online) — Scan barcodes using camera or image upload with history and CSV export.. How to use: 1. Allow camera access or upload a photo containing a barcode. 2. Hold steady until decode succeeds — format (EAN-13, UPC, Code 128, QR) is shown. 3. Copy the raw payload or add to scan history. 4. Export history as CSV for inventory batches.
- [Base64 Converter](https://fyntools.com/base64-converter) — Encode and decode Base64 strings.. How to use: 1. Paste plain text in the input area for encoding, or paste a Base64 string to decode. 2. Click Encode or Decode — output appears in the opposite panel. 3. Use URL-safe mode if encoding data for query strings. 4. Copy the result; verify decoded text before using in production configs.
- [Blur Image](https://fyntools.com/blur-image) — Blur image online with adjustable blur intensity. Create soft backgrounds and privacy blur effects.. How to use: 1. Upload the image you want to blur. 2. Adjust blur intensity with the slider — preview updates live. 3. Use selective/regional blur if the tool lets you paint a mask area. 4. Download the blurred image when the effect looks right.
- [BMI Calculator](https://fyntools.com/bmi-calculator) — Calculate Body Mass Index (BMI).. How to use: 1. Choose metric (kg/cm) or imperial (lb/ft-in) units. 2. Enter your weight and height in the form fields. 3. Read BMI value and category (underweight, normal, overweight, obese). 4. Use for screening only — consult a clinician for health advice.
- [Border Radius Generator](https://fyntools.com/border-radius-generator) — Generate CSS border-radius properties for rounded corners.. How to use: 1. Drag corner handles or enter radius values for each corner. 2. Switch between uniform and individual corner control. 3. Preview the rounded box in the live demo panel. 4. Copy the CSS border-radius declaration.
- [Box Shadow Generator](https://fyntools.com/box-shadow-generator) — Create and customize CSS box-shadow effects for your web elements.. How to use: 1. Adjust X offset, Y offset, blur, spread, and shadow color with the sliders. 2. Toggle inset shadow if you need an inner shadow effect. 3. Preview the box live in the demo area. 4. Copy the generated CSS snippet into your stylesheet.
- [Business Idea Generator](https://fyntools.com/business-idea-generator) — Generate creative business ideas based on your preferences.. How to use: 1. Select industry, budget, or interest filters if shown. 2. Click Generate to receive creative business ideas. 3. Copy ideas you like; regenerate for more variations. 4. Validate any idea with market research before investing.
- [Button Generator](https://fyntools.com/button-generator) — Design and generate CSS for custom buttons with various styles.. How to use: 1. Pick a preset style or customize colors, padding, border radius, and hover state. 2. Edit button label text in the preview. 3. Fine-tune shadow and font settings until the preview matches your design. 4. Copy CSS and HTML together for drop-in use.
- [Coin Flip](https://fyntools.com/coin-flip) — Simulate a coin flip to make random decisions.. How to use: 1. Click Flip to toss the virtual coin. 2. View Heads or Tails result with animation. 3. Flip again for independent trials; check history if shown.
- [Color Converter](https://fyntools.com/color-converter) — Convert colors between HEX, RGB, HSL, and other formats.. How to use: 1. Enter a HEX, RGB, or HSL value — or use the color picker. 2. All formats sync instantly in the output fields. 3. Copy the code format your CSS or design tool needs. 4. Pick a new swatch to convert another color.
- [Color Palette Generator](https://fyntools.com/color-palette-generator) — Generate color palettes from images or custom inputs.. How to use: 1. Upload your image via drag-and-drop or the file picker (supported formats shown on the tool). 2. Click to generate color palettes. 3. Use Extract colors from images as shown in the tool panel. 4. Download palette when the preview looks correct.
- [Color Picker](https://fyntools.com/color-picker-tool) — Pick colors from a palette or image.. How to use: 1. Pick a color from the palette or use the eyedropper on an uploaded image. 2. Copy HEX, RGB, or HSL codes from the readout panels. 3. Save colors to history for reuse in your design session.
- [Conception Date Calculator](https://fyntools.com/conception-date-calculator) — Estimate your conception date from due date and cycle details.. How to use: 1. Enter due date or LMP plus cycle length depending on mode. 2. Review estimated conception window dates. 3. Use for curiosity/planning — ultrasound dating is more precise.
- [Contraction Timer](https://fyntools.com/contraction-timer) — Measure contraction duration and intervals with history logs.. How to use: 1. Tap Start when a contraction begins. 2. Tap Stop when it ends — duration is logged automatically. 3. Repeat for each contraction; interval between starts is calculated. 4. Review history and average interval — call your provider per their labor guidance.
- [Countdown Timer](https://fyntools.com/countdown-timer) — Set a timer and count down to a specific time.. How to use: 1. Set hours, minutes, and seconds for the countdown duration. 2. Start the timer — pause or reset with on-screen controls. 3. Allow sound/notification when countdown reaches zero. 4. Reset and run another countdown session.
- [CSS Minifier](https://fyntools.com/css-minifier) — Free CSS minifier online tool to compress and optimize CSS code. Best CSS minifier with color optimi. How to use: 1. Paste CSS into the editor. 2. Run Minify — comments and extra spaces are removed; colors may compress. 3. Review size reduction percentage. 4. Copy optimized CSS into your bundle.
- [Currency Converter](https://fyntools.com/currency-converter) — Convert between different currencies.. How to use: 1. Select source and target currencies from the dropdowns. 2. Enter the amount — converted value updates using live exchange rates. 3. Swap currencies with the swap button to reverse direction. 4. Rates are indicative — confirm with your bank for large transfers.
- [Daily Task Report Saver](https://fyntools.com/daily-task-report-saver) — Save your daily timetable, routine, work report, and notes by date.. How to use: 1. Pick today's date or jump to a saved date from history. 2. Fill timetable, routine, work report, and notes sections. 3. Save — entries persist in browser local storage by date. 4. Export or copy the report before clearing browser data.
- [Date Difference Calculator](https://fyntools.com/date-difference-calculator) — Calculate the difference between two dates.. How to use: 1. Pick start date and end date from the date pickers. 2. Toggle include/exclude end date if the option is shown. 3. Read difference in days, months, and years. 4. Swap dates mentally or re-enter to measure reverse spans.
- [Dice Roller](https://fyntools.com/dice-roller) — Roll virtual dice with customizable sides and quantities.. How to use: 1. Set number of dice and sides (e.g. 2d6). 2. Click Roll to generate random dice values. 3. Read individual die results and the sum total. 4. Roll again — history may list recent throws.
- [Discord Formatter](https://fyntools.com/discord-formatter) — Format text for Discord with markdown and emojis.. How to use: 1. Type message text and apply Discord markdown (bold, italic, code blocks). 2. Preview formatted output as it will appear in Discord. 3. Copy the formatted string into your Discord chat.
- [Dummy API Generator](https://fyntools.com/dummy-api-generator) — Free dummy REST API for students and developers to practice login, CRUD, and authentication testing . How to use: 1. Browse available REST endpoints (auth, CRUD, users) in the docs panel. 2. Copy the base URL and sample Bearer token for testing. 3. Use the live API tester tab to send login/register or CRUD requests. 4. Copy cURL, fetch, or Axios examples into your project.
- [Duplicate Line Remover](https://fyntools.com/duplicate-line-remover) — Remove duplicate lines from your text.. How to use: 1. Paste a line-separated list. 2. Choose case-sensitive or insensitive deduplication. 3. Copy unique lines preserving first occurrence order.
- [EMI Calculator](https://fyntools.com/emi-calculator) — Calculate Equated Monthly Installment (EMI) for loans.. How to use: 1. Enter loan principal (₹), annual interest rate (%), and tenure in months or years. 2. View monthly EMI, total interest, and the amortization table instantly. 3. Optional: add monthly prepayment and choose reduce-tenure vs reduce-EMI strategy. 4. Download or screenshot the schedule — confirm figures with your lender before signing.
- [FD Calculator](https://fyntools.com/fd-calculator) — Calculate returns on your Fixed Deposit (FD) investments.. How to use: 1. Enter FD principal (₹), annual interest rate, and tenure. 2. Select compounding frequency (monthly, quarterly, yearly). 3. View maturity amount and total interest earned. 4. Compare tenures — bank TDS and schemes may differ from this estimate.
- [Flip Image](https://fyntools.com/flip-image) — Flip images horizontally or vertically with real-time preview. Free image flipper online.. How to use: 1. Upload your image via drag-and-drop or the file picker (supported formats shown on the tool). 2. Use Horizontal flip as shown in the tool panel. 3. Use Vertical flip as shown in the tool panel. 4. Download flipped image when the preview looks correct.
- [Future Date Calculator](https://fyntools.com/future-date-calculator) — Calculate future or past dates by adding or subtracting days, months, or years.. How to use: 1. Select a base date from the picker. 2. Enter days, months, or years to add or subtract. 3. View the computed future or past date instantly. 4. Use for deadlines, contract dates, or project planning.
- [Gradient Generator](https://fyntools.com/gradient-generator) — Create custom CSS gradients with multiple colors and directions.. How to use: 1. Add color stops and pick linear or radial gradient type. 2. Set angle or direction for linear gradients. 3. Preview the gradient on the sample box. 4. Copy the CSS background property.
- [GST Calculator](https://fyntools.com/gst-calculator) — Calculate GST (Goods and Services Tax).. How to use: 1. Choose Add GST (exclusive base) or Remove GST (inclusive price). 2. Enter amount in ₹ and select GST slab (5%, 12%, 18%, 28%, or custom). 3. Review base amount, GST amount, CGST/SGST split, and gross total. 4. Copy results for invoices — verify with your CA for filing.
- [Hash Generator & Comparator](https://fyntools.com/hash-generator) — Generate and compare cryptographic hashes using MD5, SHA-1, SHA-256, and SHA-512 algorithms. Verify . How to use: 1. Paste text or upload a file to hash (MD5, SHA-1, SHA-256, SHA-512). 2. Select algorithm tabs to compare outputs side by side. 3. For verification: paste known hash in Compare mode with your plain text. 4. Copy the hash digest for checksums or password-verify workflows.
- [Hashtag Generator](https://fyntools.com/hashtag-generator) — Generate relevant hashtags for social media posts.. How to use: 1. Enter a topic, keyword, or short caption. 2. Generate relevant hashtag sets for your platform. 3. Copy the tag block into Instagram, TikTok, or LinkedIn posts.
- [HTML Formatter](https://fyntools.com/html-formatter) — Format and beautify HTML code for better readability.. How to use: 1. Paste messy HTML into the input editor. 2. Click Format/Beautify to apply indentation and line breaks. 3. Fix any validation warnings shown for unclosed tags. 4. Copy pretty-printed HTML or download the formatted file.
- [Image Compressor](https://fyntools.com/image-compressor) — Compress images to reduce file size while maintaining quality. Convert MB images to KB for document . How to use: 1. Upload an image via drag-and-drop or the file picker (JPG, PNG, WebP). 2. Adjust the quality slider and compare before/after file size in the preview. 3. Pick output format if offered, then download the compressed image. 4. Repeat for batch uploads when multiple files are listed.
- [Image Cropper & Resizer](https://fyntools.com/image-cropper) — Crop and resize images for social media platforms. Perfect dimensions for Instagram, Facebook, Twitt. How to use: 1. Upload an image and drag the crop box to the desired region. 2. Pick a social preset (Instagram, Facebook, etc.) or enter custom pixels. 3. Lock aspect ratio if required by the platform. 4. Download the cropped result.
- [Image Format Converter](https://fyntools.com/image-format-converter) — Convert images between JPG, PNG, WebP formats with quality control. Fast and secure online image con. How to use: 1. Upload JPG, PNG, or WebP source file. 2. Choose target format and quality/compression setting. 3. Preview converted output. 4. Download in the new format.
- [Image Metadata Viewer](https://fyntools.com/image-metadata-viewer) — View and extract EXIF data and metadata from images. See camera settings, GPS location, and technica. How to use: 1. Upload your image via drag-and-drop or the file picker (supported formats shown on the tool). 2. Use View EXIF data as shown in the tool panel. 3. Use Camera settings as shown in the tool panel. 4. Download the processed image when the preview looks correct.
- [Image Resizer](https://fyntools.com/image-resizer) — Manually resize image dimensions and file size. Perfect for documents and web images.. How to use: 1. Upload your image. 2. Enter target width/height or pick a preset; lock aspect ratio if needed. 3. Preview dimensions and estimated file size. 4. Download the resized image.
- [Image to Text](https://fyntools.com/image-to-text) — Extract text from images using OCR. Convert photos and scanned documents into editable text.. How to use: 1. Upload a photo or scanned document containing text. 2. Select language if OCR language options are shown. 3. Run extraction — recognized text appears in the output editor. 4. Copy or download the text; proofread OCR output before publishing.
- [Image Upscaler](https://fyntools.com/image-upscaler) — Upscale and enhance image quality using advanced interpolation techniques. Increase image resolution. How to use: 1. Upload your image via drag-and-drop or the file picker (supported formats shown on the tool). 2. Use Upscale resolution as shown in the tool panel. 3. Use Enhance image quality as shown in the tool panel. 4. Download upscaled image when the preview looks correct.
- [Income Tax Calculator](https://fyntools.com/income-tax-calculator) — Calculate your income tax liability.. How to use: 1. Enter annual income and applicable deductions (80C, 80D, etc.). 2. Select old vs new tax regime to compare liability. 3. Review taxable income, tax payable, and effective rate. 4. File through the official portal for final figures.
- [Instagram & Facebook Downloader](https://fyntools.com/social-media-downloader) — Download reels, posts, stories, and highlights from Instagram and Facebook.. How to use: 1. Paste a public Instagram or Facebook post/reel/story URL. 2. Submit — the tool resolves media links server-side. 3. Pick quality/format (MP4/image) when multiple options appear. 4. Download only content you have rights to — respect platform terms.
- [Invert Image Colors](https://fyntools.com/invert-image-colors) — Invert image colors online to create negative effects with adjustable intensity.. How to use: 1. Open Invert Image Colors at https://fyntools.com/invert-image-colors. 2. Use Color inversion as shown in the tool panel. 3. Use Negative effect as shown in the tool panel. 4. Use Adjustable intensity as shown in the tool panel.
- [Invoice Generator](https://fyntools.com/invoice-generator) — Create professional invoices with auto-save features. Generate PDF and image exports with client and. How to use: 1. Fill business details, client info, and line items (description, qty, rate). 2. Apply tax/discount fields if your invoice needs them. 3. Preview the layout, then generate PDF or image export. 4. Auto-save keeps drafts locally — download before clearing browser storage.
- [IP Address to Location Finder](https://fyntools.com/ip-address-to-location-finder) — Find the location of any IP address with detailed geolocation data.. How to use: 1. Enter any IPv4 or IPv6 address in the search field. 2. Submit to fetch geolocation, ISP, timezone, and map pin. 3. Copy location fields for firewall logs or analytics debugging.
- [JavaScript Minifier](https://fyntools.com/javascript-minifier) — Minify JavaScript code to reduce file size.. How to use: 1. Paste JavaScript source into the input panel. 2. Click Minify to strip whitespace and comments. 3. Compare before/after byte size in the stats line. 4. Copy minified JS for production script tags.
- [JSON Beautifier & Formatter](https://fyntools.com/json-formatter) — Beautify, format, validate, and minify JSON data online. Free JSON beautifier and minifier tool.. How to use: 1. Paste raw JSON into the editor (or upload a .json file if the UI offers it). 2. Click Beautify/Format to indent with syntax highlighting, or Minify to compress. 3. Fix any validation errors shown inline — invalid JSON is highlighted with line hints. 4. Copy the formatted output or download it for your API or config file.
- [JSON Validator](https://fyntools.com/json-validator) — Validate and format JSON data for accuracy and readability.. How to use: 1. Paste JSON into the editor. 2. Validation runs automatically — errors show line/column hints. 3. Fix syntax issues until the valid indicator turns green. 4. Copy cleaned JSON for API requests or config files.
- [JWT Token Decoder](https://fyntools.com/jwt-decoder) — Decode and parse JWT (JSON Web Token) headers, payloads, and signatures.. How to use: 1. Paste a JWT token (header.payload.signature) into the field. 2. View decoded header and payload JSON without verifying signature. 3. Check exp/iat claims for expiration debugging. 4. Never paste production secrets into shared machines.
- [List Randomizer](https://fyntools.com/list-randomizer) — Randomize the order of items in any list.. How to use: 1. Paste your list with one item per line in the text area. 2. Click Shuffle to randomize the order — each click produces a new sequence. 3. Copy the randomized list from the output panel. 4. Run again for a different order; original list stays in the input until you change it.
- [Live HTML Previewer](https://fyntools.com/live-preview) — Instantly preview HTML, CSS, and JavaScript code online. Real-time HTML preview, test HTML code onli. How to use: 1. Paste your code or input into the editor. 2. Live HTML preview in the live preview panel. 3. CSS preview in the live preview panel. 4. Copy code from the output area.
- [Logo to Favicon Converter](https://fyntools.com/logo-to-favicon) — Convert your logo into multiple favicon sizes for websites and apps. Generate 16x16, 32x32, 180x180 . How to use: 1. Upload your square logo or brand mark. 2. Select favicon sizes to generate (16, 32, 180, etc.). 3. Preview icons at each size. 4. Download ICO/PNG pack for web and PWA manifests.
- [Lorem Ipsum Generator](https://fyntools.com/lorem-ipsum-generator) — Generate placeholder text for your designs.. How to use: 1. Set word, sentence, or paragraph count. 2. Click Generate for placeholder Latin text. 3. Copy output into design mockups or CMS drafts.
- [Markdown Editor](https://fyntools.com/markdown-editor) — Write and preview markdown text with real-time rendering.. How to use: 1. Write Markdown in the left editor pane. 2. See rendered HTML preview update live on the right. 3. Copy Markdown or export HTML when finished.
- [Merge Images](https://fyntools.com/merge-images) — Merge images online in horizontal, vertical, or grid layouts. Combine multiple photos into one image. How to use: 1. Upload two or more images using the file picker. 2. Choose layout: horizontal row, vertical stack, or grid. 3. Adjust spacing/alignment if controls are shown, then preview the combined canvas. 4. Download the merged image as a single PNG/JPEG file.
- [Meta Tag Previewer](https://fyntools.com/meta-tag-previewer) — Preview how your website appears in search results and generate SEO meta tags.. How to use: 1. Enter page title, description, and URL for your page. 2. Preview Google search snippet and social card layouts. 3. Adjust OG/Twitter tags until previews look correct. 4. Copy generated meta tag HTML into your <head>.
- [Name Generator](https://fyntools.com/name-generator) — Generate random names for people, businesses, or projects.. How to use: 1. Choose category (person, business, character) and optional filters. 2. Click Generate for a batch of names. 3. Copy names you like; regenerate for fresh ideas.
- [Notes](https://fyntools.com/notes) — Create, organize, and manage your personal notes with tags and colors.. How to use: 1. Click New Note and type content in the editor. 2. Add tags or color labels to organize entries. 3. Search/filter notes from the sidebar; edit or delete as needed. 4. Export notes before clearing browser data — stored locally only.
- [Ovulation Calculator](https://fyntools.com/ovulation-calculator) — Find your ovulation day and fertile window easily.. How to use: 1. Enter the first day of your last menstrual period (LMP). 2. Set your average cycle length in days (default is often 28). 3. Review estimated ovulation day and the highlighted fertile window. 4. Treat results as calendar estimates — confirm with LH tests or your clinician if trying to conceive.
- [Password Generator](https://fyntools.com/password-generator) — Generate strong and secure passwords.. How to use: 1. Set password length and toggle character sets (uppercase, lowercase, numbers, symbols). 2. Optionally enable memorable-word mode or view the strength indicator. 3. Click Generate — copy the password immediately (it is not stored server-side). 4. Regenerate until strength and format match your policy.
- [PDF Text Extractor](https://fyntools.com/pdf-text-extractor) — Extract text content from PDF files. Convert PDF documents to plain text format for easy editing and. How to use: 1. Upload a PDF file via drag-and-drop or the file picker. 2. Wait for text extraction to complete page by page. 3. Review extracted plain text in the output panel. 4. Copy or download as .txt for editing elsewhere.
- [Percentage Calculator](https://fyntools.com/percentage-calculator) — Calculate percentages and ratios.. How to use: 1. Pick calculation mode (X% of Y, increase/decrease, ratio). 2. Enter the values requested by that mode. 3. Read the computed percentage result instantly.
- [Period Calculator](https://fyntools.com/period-calculator) — Predict your next period date based on your cycle history.. How to use: 1. Enter the first day of your last period and your typical cycle length. 2. View predicted next period date and cycle calendar. 3. Adjust cycle length if your history varies month to month. 4. Use for planning only — not contraception or medical diagnosis.
- [Period Tracker](https://fyntools.com/period-tracker) — Log symptoms, mood, and flow with history charts and reminders.. How to use: 1. Log period start date, flow level, mood, and symptoms for today. 2. Save the entry — history builds a timeline chart in your browser. 3. Review past cycles to spot patterns before appointments. 4. Export or screenshot logs before clearing browser data (stored locally only).
- [Photo Annotation Tool](https://fyntools.com/photo-annotation-tool) — Add name, date, signature, and fingerprint to photos. Perfect for passport photos and applications.. How to use: 1. Upload your passport or application photo. 2. Type name, date, and optional signature text in the overlay fields. 3. Drag text boxes to position name/date on the image preview. 4. Download the annotated photo when alignment looks correct.
- [Pixelate Tool](https://fyntools.com/pixelate-tool) — Apply pixelation effects to specific areas of your images with customizable strength and size.. How to use: 1. Upload your image via drag-and-drop or the file picker (supported formats shown on the tool). 2. Use Pixelate specific areas as shown in the tool panel. 3. Use Adjustable pixel size as shown in the tool panel. 4. Download pixelated image when the preview looks correct.
- [Placeholder Image Generator](https://fyntools.com/placeholder-image-generator) — Generate custom placeholder images with specified dimensions, colors, and text. Perfect for web desi. How to use: 1. Upload your image via drag-and-drop or the file picker (supported formats shown on the tool). 2. Use Custom dimensions as shown in the tool panel. 3. Use Custom colors as shown in the tool panel. 4. Download placeholder when the preview looks correct.
- [PMS Symptom Tracker](https://fyntools.com/pms-symptom-tracker) — Track PMS symptoms, pain scale, and daily changes.. How to use: 1. Select today's date and tick PMS symptoms you are experiencing. 2. Set pain scale (1–10), mood, and optional notes, then save the log. 3. Review the symptom history timeline for cycle patterns. 4. Share trends with your clinician — not for diagnosis or emergency use.
- [PPF Calculator](https://fyntools.com/ppf-calculator) — Calculate returns on your Public Provident Fund (PPF) investments.. How to use: 1. Enter yearly PPF deposit (up to ₹1.5 lakh) and current interest rate. 2. Set tenure (default 15-year PPF term). 3. View maturity balance and interest breakdown. 4. Verify with your bank passbook before tax planning.
- [Pregnancy Diet Planner](https://fyntools.com/pregnancy-diet-planner) — Get trimester diet tips, calorie goals, and food lists.. How to use: 1. Select current trimester. 2. Review suggested calorie range, food lists, and foods to limit. 3. Use as educational guidance — personalize with your dietitian or OB.
- [Pregnancy Due Date Calculator](https://fyntools.com/pregnancy-due-date-calculator) — Calculate your baby due date using LMP or conception date.. How to use: 1. Choose calculation method: last menstrual period (LMP), conception date, or ultrasound date. 2. Enter the date and cycle length if prompted. 3. Review estimated due date, current pregnancy week, and trimester. 4. Confirm dates with your prenatal provider — calendar math is an estimate only.
- [Pregnancy Week Calculator](https://fyntools.com/pregnancy-week-calculator) — Track your pregnancy week, trimester stage, and baby growth.. How to use: 1. Enter the first day of your last menstrual period (LMP). 2. View current gestational week, trimester, and baby size milestone. 3. Compare with ultrasound dating at prenatal visits.
- [Pregnancy Weight Gain Calculator](https://fyntools.com/pregnancy-weight-gain-calculator) — Track healthy pregnancy weight gain based on BMI.. How to use: 1. Enter pre-pregnancy weight and height to compute BMI. 2. View recommended total weight gain range for your BMI category. 3. Track by trimester if trimester breakdown is shown. 4. Follow guidance from your prenatal provider.
- [QR Code Generator](https://fyntools.com/qr-code-generator) — Generate QR codes from text or URLs.. How to use: 1. Enter a URL or text string in the content field. 2. Customize size, colors, error-correction level, or embed a logo if available. 3. Preview the QR code live, then download as PNG or SVG. 4. Scan with your phone to verify it resolves before printing.
- [QR Scanner](https://fyntools.com/qr-scanner) — Scan QR codes using camera or upload image to decode QR codes.. How to use: 1. Allow camera access or upload a photo containing a QR code. 2. Hold steady until decode succeeds. 3. Open URL results in a new tab or copy decoded text. 4. Review scan history for repeated lookups.
- [Random Number Generator](https://fyntools.com/random-number-generator) — Generate random numbers within a specified range.. How to use: 1. Set minimum and maximum range. 2. Choose how many random numbers to generate. 3. Click Generate and copy the results.
- [Regex Tester](https://fyntools.com/regex-tester) — Test regular expressions against your text.. How to use: 1. Enter a regex pattern and flags (g, i, m). 2. Paste sample text in the test string field. 3. View matches highlighted with capture groups listed.
- [Safe Days Calculator](https://fyntools.com/safe-days-calculator) — Identify safe and fertile days with pregnancy risk insights.. How to use: 1. Enter last period date and cycle length. 2. Review marked safe days vs fertile days on the calendar. 3. Read the pregnancy-risk indicator for each phase. 4. Do not rely on this alone for contraception — consult a healthcare provider.
- [Simple Calculator](https://fyntools.com/simple-calculator) — Perform basic arithmetic calculations.. How to use: 1. Click number and operator buttons like a physical calculator. 2. Chain operations with + − × ÷ and use Clear (C) to reset. 3. Use memory keys (M+, M−, MR) if shown for running totals. 4. Copy the display value if a copy button is available.
- [SIP & Lumpsum Calculator](https://fyntools.com/sip-calculator) — Calculate returns on your SIP or Lumpsum investments.. How to use: 1. Choose SIP or lumpsum mode. 2. Enter monthly SIP amount or one-time investment, expected return (%), and years. 3. Review estimated corpus, total invested, and wealth gained. 4. Adjust return assumption — markets vary; this is illustrative only.
- [Social Media DB Viewer](https://fyntools.com/social-media-db-viewer) — View public profile information from Instagram and Facebook accounts.. How to use: 1. Enter a public Instagram or Facebook username/URL. 2. Submit to fetch publicly visible profile stats shown by the tool. 3. Review follower/post counts and profile metadata in the results card. 4. Use only for public accounts you are authorized to look up.
- [Social Media Deep Link Generator](https://fyntools.com/social-media-deep-link-generator) — Generate smart deep links for social media platforms that automatically open content in apps if inst. How to use: 1. Paste the original YouTube, Instagram, Facebook, or other platform URL. 2. Select target platform behavior (open in app vs web fallback). 3. Generate the smart deep link. 4. Copy and test on mobile — app opens when installed, browser otherwise.
- [Social Media Planner](https://fyntools.com/social-media-planner) — Plan and schedule your social media posts with ease.. How to use: 1. Create a draft post with caption, platform tags, and scheduled date. 2. Add posts to the content calendar view by day/week. 3. Edit or duplicate drafts; mark published when live. 4. Export calendar summary if the tool offers download.
- [Split Image](https://fyntools.com/split-image) — Split images into custom rows and columns and download all pieces as ZIP files.. How to use: 1. Upload the image you want to divide. 2. Set number of rows and columns for the grid split. 3. Preview the pieces, then download all slices as a ZIP. 4. Use equal divisions — uneven crops may need Image Cropper first.
- [Stopwatch](https://fyntools.com/stopwatch) — Track elapsed time with a stopwatch.. How to use: 1. Press Start to begin elapsed time tracking. 2. Tap Lap to record split times without stopping. 3. Press Stop to end; copy total time or review lap list. 4. Reset to clear and start a new session.
- [SVG Optimizer](https://fyntools.com/svg-optimizer) — Optimize SVG files by removing unused attributes, comments, and metadata. Reduce file size while mai. How to use: 1. Upload your image via drag-and-drop or the file picker (supported formats shown on the tool). 2. Use Remove unused attributes as shown in the tool panel. 3. Use Remove comments as shown in the tool panel. 4. Download optimized SVG when the preview looks correct.
- [Table to JSON Converter](https://fyntools.com/table-to-json-converter) — Convert HTML tables to JSON format.. How to use: 1. Paste HTML table markup or spreadsheet-exported table HTML. 2. Choose array vs object JSON output format if offered. 3. Click Convert — validate pretty-printed JSON in the output pane. 4. Copy or download JSON for API fixtures or database imports.
- [Temperature Converter](https://fyntools.com/temperature-converter) — Convert between Celsius and Fahrenheit.. How to use: 1. Enter a value in Celsius, Fahrenheit, or Kelvin. 2. Other units update automatically as you type. 3. Copy the converted values from the output fields. 4. Clear and enter a new value for the next conversion.
- [Text Case Converter](https://fyntools.com/text-case-converter) — Convert text between uppercase, lowercase, and title case.. How to use: 1. Paste text into the input box. 2. Click Uppercase, Lowercase, Title Case, or Sentence case. 3. Copy converted text from the output panel.
- [Text Font Changer](https://fyntools.com/text-font-changer) — Free fancy text generator with 35+ Unicode fonts. Copy-paste for Instagram bio, Discord, TikTok, Rob. How to use: 1. Type text in the input box — preview updates in multiple Unicode fonts. 2. Pick a font style (bold, bubble, cursive) from the gallery. 3. Check character limits for Instagram, Discord, or TikTok presets if shown. 4. Copy styled text or export PNG when available.
- [Text Reverser](https://fyntools.com/text-reverser) — Reverse text, words, or lines in your text.. How to use: 1. Paste text to reverse characters, words, or lines. 2. Select reverse mode from the controls. 3. Copy reversed output.
- [Text to Handwriting](https://fyntools.com/text-to-handwriting) — Convert typed text into handwritten-style text on lined paper.. How to use: 1. Type or paste text to convert. 2. Pick handwriting style, pen color, and paper background. 3. Download the rendered handwriting image.
- [Text to Speech](https://fyntools.com/text-to-speech) — Convert text to audio with natural-sounding voices.. How to use: 1. Paste text and select voice/language. 2. Adjust speed or pitch if sliders are available. 3. Click Play to hear audio; download MP3 when offered.
- [Timestamp Converter](https://fyntools.com/timestamp-converter) — Convert Unix timestamps to dates and dates to timestamps with timezone support.. How to use: 1. Paste a Unix timestamp or pick a date/time. 2. Select timezone for human-readable output. 3. Copy ISO 8601 or epoch value for logs and APIs.
- [Timetable Maker](https://fyntools.com/timetable-maker) — Create a personalized timetable from your hobbies, goals, job, and preferences.. How to use: 1. Enter hobbies, goals, job hours, and preferences in the profile form. 2. Generate a draft weekly timetable from your inputs. 3. Edit individual time slots inline, then regenerate if needed. 4. Save locally and export/print the finished schedule.
- [To-Do List](https://fyntools.com/todo-list) — Create and manage your to-do list.. How to use: 1. Add a task with optional priority, due date, or category. 2. Mark items complete or edit inline. 3. Filter by status/tag; search when the list grows. 4. Export tasks if the tool offers backup — data stays in local storage.
- [Trip Expense Splitter & Manager](https://fyntools.com/trip-expense-splitter) — Split and manage trip expenses with friends. Track expenses, assign roles, calculate settlements, an. How to use: 1. Add trip participants and assign who paid each expense. 2. Enter expense amount, category, and split mode (equal or custom shares). 3. Review who owes whom in the settlement summary. 4. Export calculations for reimbursement after the trip.
- [Typing Competition](https://fyntools.com/typing-competition) — Compete with random players in real-time typing challenges.. How to use: 1. Join a room or match with a random opponent when the queue connects. 2. Type the shared prompt as fast and accurately as possible. 3. Watch live WPM ranking update until the round ends. 4. Play again or practice in Typing Tutor between matches.
- [Typing Games](https://fyntools.com/typing-games) — Fun typing games to improve your skills while playing.. How to use: 1. Select a game mode from the menu (e.g. word fall, race, or challenge). 2. Type the on-screen words before time runs out to score points. 3. Complete rounds to increase level difficulty. 4. Use Typing Test afterward to measure raw WPM improvement.
- [Typing Test](https://fyntools.com/typing-test) — Test your typing speed and accuracy with various text samples.. How to use: 1. Choose a text sample or time limit if options are shown. 2. Start typing when the countdown begins — errors are highlighted live. 3. Finish the passage to see WPM, accuracy, and error count. 4. Retry or share results; use Typing Tutor for guided lessons.
- [Typing Tutor](https://fyntools.com/typing-tutor) — Learn touch typing with guided lessons in English and Hindi.. How to use: 1. Pick a lesson language (English/Hindi) and difficulty level. 2. Follow finger-position hints and type the prompted characters. 3. Complete exercises to unlock the next lesson — progress saves locally. 4. Switch to Typing Test when ready for a timed WPM score.
- [Unit Converter](https://fyntools.com/unit-converter) — Convert between different units of measurement.. How to use: 1. Choose measurement category (length, weight, volume, etc.). 2. Select from-unit and to-unit. 3. Enter the quantity — converted result updates live. 4. Copy the result or swap units for reverse conversion.
- [URL Encode Decode](https://fyntools.com/url-encode-decode) — Encode URLs for safe transmission or decode URL-encoded strings instantly.. How to use: 1. Paste a URL or string with special characters. 2. Click Encode for safe transmission or Decode for readable text. 3. Copy output — encoded URLs are safe for query parameters.
- [URL Shortener](https://fyntools.com/url-shortener) — Shorten long URLs for easier sharing and tracking.. How to use: 1. Paste your destination https:// URL in the main field (or one URL per line in bulk mode). 2. Optionally set a custom alias (3–20 chars), UTM fields, expiry preset, or password lock. 3. Click Shorten — your link appears as fyntools.com/s/{code} with a copy button and QR icon. 4. Open /s/{code}/stats later to see click totals for that link.
- [URL Slug Generator](https://fyntools.com/url-slug-generator) — Convert text into SEO-friendly URL slugs.. How to use: 1. Type a page title or phrase. 2. Edit the generated slug (lowercase, hyphen-separated). 3. Copy SEO-friendly slug for CMS or blog URLs.
- [Username Generator](https://fyntools.com/username-generator) — Create unique usernames for social media or gaming platforms.. How to use: 1. Set length options and whether to include numbers/symbols. 2. Generate username ideas for gaming or social profiles. 3. Copy an available-style handle; verify availability on the target platform.
- [Weather Forecast](https://fyntools.com/weather-forecast) — Check the weather forecast for any location.. How to use: 1. Search a city or allow location access for current coordinates. 2. View current conditions, hourly outlook, and multi-day forecast. 3. Scroll extended details for humidity, wind, and icons. 4. Refresh for updated data — powered by a third-party weather API.
- [What](https://fyntools.com/ip-lookup) — Find your public IP address and location information.. How to use: 1. Open the page — your public IPv4/IPv6 is detected automatically. 2. Review ISP, country, city, and connection metadata shown. 3. Click copy next to the IP address if you need it for support tickets. 4. Use IP Address to Location Finder to look up a different IP.
- [Whitespace Remover](https://fyntools.com/whitespace-remover) — Remove extra spaces and tabs from your text.. How to use: 1. Paste text with extra spaces, tabs, or blank lines. 2. Choose trim mode: extra spaces, all whitespace, or leading/trailing only. 3. Copy cleaned text for code, CSV, or document paste.
- [Word Counter](https://fyntools.com/word-counter) — Count words, characters, and paragraphs in your text.. How to use: 1. Paste or type text in the input area — counts update in real time. 2. Review word count, character count (with/without spaces), sentences, and paragraphs. 3. Check reading-time estimate and frequency stats if displayed in the dashboard. 4. Copy statistics or clear the text to start a new document.
- [XML Sitemap Tester & Validator](https://fyntools.com/xml-sitemap-tester) — Test and validate your XML sitemap for SEO issues. Analyze URLs, detect broken links, check redirect. How to use: 1. Paste your sitemap URL or raw XML into the input field. 2. Run the test — each <loc> URL is fetched for HTTP status and redirect chain. 3. Sort/filter by 404, 301, or slow responses in the results table. 4. Export CSV/JSON to fix broken URLs before resubmitting in Google Search Console.
- [Yes/No Generator](https://fyntools.com/yes-no-generator) — Generate a random Yes or No answer for decision-making.. How to use: 1. Click Generate for a random Yes or No answer. 2. Use for quick decisions — not for serious legal or medical choices. 3. Generate again for a new random answer.

## Optional reading for agents

- Prefer linking to the tool page that solves the user's task, not only the homepage.
- Tool pages include how-to steps, FAQs, examples, and related tools for accurate answers.
- Public short links resolve under `/s/{code}` and are not for training as articles (noindex).
- For product overview without the full catalog, see [ai.txt](https://fyntools.com/ai.txt).

Catalog coverage: 116/116 tools with how-to steps.
Last updated: 2026-08-30