Free online tools. No uploads. No limits.
Compress images, merge PDFs, format JSON, generate QR codes and more — everything runs on your device, so your files stay private and it works even offline.
Popular tools
Passport Photo Maker
Make a passport or visa photo in the exact size (35×45 mm, 2×2 in, 33×48 mm…) with head guides, 600 DPI export and a printable 4×6 or A4 sheet. Free, no upload.
Crop Image
Crop a photo by dragging a box, with free-form or fixed ratios (1:1, 4:5, 16:9, 9:16). Exact pixel output, in your browser, free and private.
Image Compressor
Compress JPG, PNG and WebP images to a target size like 100 KB or 200 KB, in bulk, without uploading. Free, no limits, no watermark.
Image Resizer
Resize JPG, PNG, WebP and HEIC images by width, height, exact dimensions or percentage. Batch resize up to 200 photos in your browser, free.
Image Converter
Convert between JPG, PNG, WebP, AVIF, BMP, GIF and HEIC in your browser. Batch convert up to 200 images, free, no upload, no watermark.
HEIC to JPG
Convert iPhone HEIC and HEIF photos to JPG or PNG in your browser. Batch convert hundreds of photos, free, without uploading them anywhere.
Merge PDF
Combine multiple PDF files into one in your browser. No upload, no file limit, no watermark. Drag to reorder, then download the merged PDF.
Split PDF
Split a PDF into separate pages, or extract page ranges like 1-3, 7, 10-12. Runs in your browser, free, no upload, no watermark.
PDF to JPG
Convert every page of a PDF to JPG or PNG images at 72–300 DPI, in your browser. Free, no upload, no watermark, all pages at once.
Image to PDF
Turn JPG, PNG, WebP or HEIC images into a single PDF with A4, Letter or fit-to-image pages. Free, in your browser, no upload, no watermark.
JSON Formatter & Validator
Pretty-print, validate and minify JSON instantly in your browser. Shows the exact line and column of syntax errors. Sort keys, choose indentation.
Word Counter
Count words, characters (with and without spaces), sentences, paragraphs and reading time as you type. Free, private, works in any language.
QR Code Generator
Create QR codes for URLs, text, Wi-Fi and more. Download as PNG or vector SVG, choose colours and size. Free, no account, codes never expire.
Password Generator
Generate strong random passwords of any length with letters, numbers and symbols, using your browser’s cryptographic random source. Nothing sent to a server.
Percentage Calculator
Work out X% of Y, what percent X is of Y, percentage increase or decrease, and add or subtract a percentage. Shows the formula and working.
Video to GIF
Turn MP4, MOV or WebM clips into high-quality animated GIFs with a custom palette, frame rate, width and start/duration. Runs in your browser, free, no watermark.
Video Compressor
Shrink MP4, MOV and WebM files by 50–90% with H.264 quality control and optional downscaling. No upload, no watermark, no size limit.
Video to MP3
Extract the audio track from MP4, MOV, MKV or WebM as MP3, M4A, WAV or OGG in your browser. Free, no upload, no limits.
Audio Converter
Convert audio files between MP3, WAV, M4A/AAC, OGG and FLAC in your browser, in batches, with bitrate control. Free, private, no size limit.
Unit Converter
Convert between metric and imperial units of length, mass, temperature, area, volume, speed, time, data, pressure, energy and power, with the formula shown.
Colour Converter & Picker
Convert any colour between HEX, RGB, HSL and CMYK, see shades, tints and harmonies, and check WCAG contrast. Works with CSS colour names.
Time Zone Converter
Convert a time between any two of 39 major cities, see both current times, the hour difference and an hour-by-hour table of shared working hours.
🖼️ Image tools
Passport Photo Maker
Make a passport or visa photo in the exact size (35×45 mm, 2×2 in, 33×48 mm…) with head guides, 600 DPI export and a printable 4×6 or A4 sheet. Free, no upload.
Crop Image
Crop a photo by dragging a box, with free-form or fixed ratios (1:1, 4:5, 16:9, 9:16). Exact pixel output, in your browser, free and private.
Image Compressor
Compress JPG, PNG and WebP images to a target size like 100 KB or 200 KB, in bulk, without uploading. Free, no limits, no watermark.
Image Resizer
Resize JPG, PNG, WebP and HEIC images by width, height, exact dimensions or percentage. Batch resize up to 200 photos in your browser, free.
Image Converter
Convert between JPG, PNG, WebP, AVIF, BMP, GIF and HEIC in your browser. Batch convert up to 200 images, free, no upload, no watermark.
HEIC to JPG
Convert iPhone HEIC and HEIF photos to JPG or PNG in your browser. Batch convert hundreds of photos, free, without uploading them anywhere.
PNG to JPG
Convert PNG images to JPG in your browser. Choose the quality and the colour that replaces transparency. Batch up to 100 files, free, nothing uploaded.
JPG to PNG
Convert JPG and JPEG photos to lossless PNG files in your browser. Batch convert up to 100 images, free, no sign-up and nothing is uploaded.
📄 PDF tools
Merge PDF
Combine multiple PDF files into one in your browser. No upload, no file limit, no watermark. Drag to reorder, then download the merged PDF.
Split PDF
Split a PDF into separate pages, or extract page ranges like 1-3, 7, 10-12. Runs in your browser, free, no upload, no watermark.
PDF to JPG
Convert every page of a PDF to JPG or PNG images at 72–300 DPI, in your browser. Free, no upload, no watermark, all pages at once.
Image to PDF
Turn JPG, PNG, WebP or HEIC images into a single PDF with A4, Letter or fit-to-image pages. Free, in your browser, no upload, no watermark.
Rotate PDF
Turn sideways or upside-down PDF pages the right way up. Rotate every page or just a range, 90, 180 or 270 degrees. In your browser, no upload.
Delete PDF Pages
Remove pages from a PDF by number or range, or keep only the pages you list. Shows the page count before and after. Runs entirely in your browser.
Reorder PDF Pages
Rearrange the pages of a PDF by dragging thumbnails, or type an order like 3,1,2. Duplicate or drop pages as you go. Free and fully in-browser.
Compress PDF
Make a scanned PDF much smaller by re-rendering each page at a lower DPI and JPEG quality. Shows before and after size. No upload, no watermark.
⌨️ Text & developer tools
JSON Formatter & Validator
Pretty-print, validate and minify JSON instantly in your browser. Shows the exact line and column of syntax errors. Sort keys, choose indentation.
Word Counter
Count words, characters (with and without spaces), sentences, paragraphs and reading time as you type. Free, private, works in any language.
Base64 Encode / Decode
Encode text to Base64 or decode Base64 back to text, with full UTF-8 and URL-safe support. Instant, free and processed in your browser.
Text Diff Checker
Compare two blocks of text line by line and see additions and deletions highlighted. Free, instant, runs in your browser, nothing uploaded.
URL Encode / Decode
Percent-encode text for URLs or decode it back. Pick encodeURIComponent, encodeURI or form encoding. UTF-8 safe and processed in your browser.
HTML Encode / Decode
Escape text to HTML entities and decode them back. Handles &, <, >, quotes and non-ASCII characters, plus named, decimal and hex references.
Case Converter
Convert text between UPPER, lower, Title and Sentence case plus camelCase, PascalCase, snake_case, kebab-case and CONSTANT_CASE.
Slug Generator
Turn any title into a clean URL slug. Transliterates accents, Greek and Cyrillic, strips punctuation, and lets you set the separator and length.
✨ Generators
Lorem Ipsum Generator
Generate placeholder text by paragraphs, sentences or exact word count. Start with the classic opening phrase and optionally wrap in HTML tags.
QR Code Generator
Create QR codes for URLs, text, Wi-Fi and more. Download as PNG or vector SVG, choose colours and size. Free, no account, codes never expire.
Password Generator
Generate strong random passwords of any length with letters, numbers and symbols, using your browser’s cryptographic random source. Nothing sent to a server.
Colour Converter & Picker
Convert any colour between HEX, RGB, HSL and CMYK, see shades, tints and harmonies, and check WCAG contrast. Works with CSS colour names.
Aliceblue colour
Aliceblue is #F0F8FF, rgb(240, 248, 255), hsl(208, 100%, 97%). Shades, tints, complementary colours and contrast ratio for Aliceblue.
Antiquewhite colour
Antiquewhite is #FAEBD7, rgb(250, 235, 215), hsl(34, 78%, 91%). Shades, tints, complementary colours and contrast ratio for Antiquewhite.
Aqua colour
Aqua is #00FFFF, rgb(0, 255, 255), hsl(180, 100%, 50%). Shades, tints, complementary colours and contrast ratio for Aqua.
Aquamarine colour
Aquamarine is #7FFFD4, rgb(127, 255, 212), hsl(160, 100%, 75%). Shades, tints, complementary colours and contrast ratio for Aquamarine.
🎬 Audio & video tools
Video to GIF
Turn MP4, MOV or WebM clips into high-quality animated GIFs with a custom palette, frame rate, width and start/duration. Runs in your browser, free, no watermark.
Video Compressor
Shrink MP4, MOV and WebM files by 50–90% with H.264 quality control and optional downscaling. No upload, no watermark, no size limit.
Video to MP3
Extract the audio track from MP4, MOV, MKV or WebM as MP3, M4A, WAV or OGG in your browser. Free, no upload, no limits.
Trim Video
Cut a section out of a video by start and end time. Stream-copy mode keeps full quality and finishes in seconds; re-encode mode is frame-accurate. No upload.
Audio Converter
Convert audio files between MP3, WAV, M4A/AAC, OGG and FLAC in your browser, in batches, with bitrate control. Free, private, no size limit.
Video Converter
Convert MOV, MKV, AVI, WebM or M4V to MP4 (H.264) or WebM in your browser, with optional downscaling. Free, no upload, no watermark.
Mute Video
Strip the audio track from an MP4, MOV or WebM in seconds without re-encoding the video. Free, private, no quality loss.
🔁 Converters & calculators
Percentage Calculator
Work out X% of Y, what percent X is of Y, percentage increase or decrease, and add or subtract a percentage. Shows the formula and working.
BMI Calculator
Work out body mass index in metric or imperial units, see the WHO category and the healthy weight range for your height. The sum is shown.
Age Calculator
Get an exact age in years, months and days from a date of birth, plus total days and weeks, the day of the week you were born and your next birthday.
Date Difference Calculator
Count the days, weeks, months and years between two dates, with options to count only working days and to include or exclude the end date.
Loan Calculator
Monthly payment, total interest and an amortisation schedule for any loan amount, rate and term. Shows the formula and the first twelve months.
Unit Converter
Convert between metric and imperial units of length, mass, temperature, area, volume, speed, time, data, pressure, energy and power, with the formula shown.
Metre to foot
Convert metres to feet instantly. 1 m = 3.2808 ft. Formula, conversion table and worked example.
Foot to metre
Convert feet to metres instantly. 1 ft = 0.3048 m. Formula, conversion table and worked example.
Why ToolFlint?
Most "free" online tools upload your files to a server, add watermarks, cap you at a few files a day and push you to sign up. ToolFlint takes a different approach: the processing code is downloaded to your browser and runs there, using WebAssembly and the same graphics APIs your browser already uses. That means no upload time, no file-size games, no queue, and nothing for anyone to leak. You can open a tool, turn off your internet connection and it will still work.
We publish exactly how each tool handles your data, keep a public changelog, and read every message sent to our contact page.