ToolKnit — 62 Free Browser-Based Online Tools
ToolKnit — 62 Free Browser-Based Online Tools
Free browser tools. No uploads, no signups. Your files never leave your device.
ToolKnit is a free collection of 62 browser-based tools for PDF, image, video, audio, text, and creative tasks. Every tool runs 100% client-side using JavaScript, Canvas, WebAssembly, and modern browser APIs — no files are ever uploaded to a server.
🔗 Live site: toolknit.com
Tools (62)
PDF Tools
Tool | Description |
|---|---|
Reduce PDF file size with 3 compression levels | |
Combine multiple PDFs into one document | |
Convert PDF pages to high-quality PNG/JPG | |
Create PDF from images with custom page layout | |
Convert Word documents to PDF in the browser |
Image Tools
Tool | Description |
|---|---|
AI-powered background removal with manual refinement | |
Reduce image file size while preserving quality | |
Resize images by pixels or percentage | |
Crop images with custom aspect ratios | |
Flip, mirror, and rotate images | |
Convert Adobe Illustrator files to PNG | |
Convert iPhone HEIC photos to JPG | |
Convert photos to retro pixel art | |
JPG ↔ PNG ↔ WebP | JPG→PNG · PNG→JPG · JPG→WebP · PNG→WebP · WebP→JPG · WebP→PNG |
Video & Audio Tools
Tool | Description |
|---|---|
Reduce video file size using ffmpeg.wasm | |
Create animated GIFs from video clips | |
Extract audio track from any video | |
Audio format conversion |
Text & Data Tools
Tool | Description |
|---|---|
Format, validate, and minify JSON | |
Live preview markdown editor | |
Compare two texts side by side | |
Count characters, words, sentences | |
Generate QR codes for URLs, text, Wi-Fi | |
Crypto-secure passwords with strength meter | |
Generate placeholder text | |
Extract text from images using Tesseract.js |
Calculator Tools
Tool | Description |
|---|---|
Calculate exact age from birthdate | |
Body Mass Index with visual health bar | |
All percentage calculation modes | |
Length, weight, temperature, and more | |
Calculate tip, total & split bill | |
Monthly payments & amortization schedule |
Time & Productivity
Tool | Description |
|---|---|
Focus & break intervals | |
Millisecond precision with laps | |
Visual countdown with audio alert | |
80+ cities, live time zones | |
Unix epoch to human-readable date | |
Create and export invoices |
Creative & Fun
Tool | Description |
|---|---|
Draw or type signature, download transparent PNG | |
Schedule planner with image & PDF export | |
CSS linear & radial gradient builder | |
HEX/RGB/HSL picker + palette generator | |
Freeform drawing and sketching | |
Unicode text styles for social media | |
WPM, accuracy & keystroke tracking | |
Test every key on your keyboard | |
4 modes, millisecond precision | |
Clicks per second benchmark | |
Mouse accuracy & speed training | |
Custom wheel, up to 15 options | |
3D animation with statistics | |
Random decision helpers |
World Holidays Calendar
Browse 3,400+ public and cultural holidays across 122 countries — filterable by country, month, and type.
Open Source
AI to PNG Standalone
A minimal, standalone version of the browser-based AI to PNG converter. Two files, zero server dependencies.
⚙️ Stack: PDF.js + Canvas API + JSZip
🔗 Live version: toolknit.com/tools/ai-to-png.html
Background Remover Standalone
AI-powered background removal running entirely in the browser via WebAssembly, with manual brush/eraser refinement.
⚙️ Stack: @imgly/background-removal (ONNX/WASM) + Canvas mask editing
🔗 Live version: toolknit.com/tools/background-remover.html
✨ Features: auto AI removal, manual brush/eraser, undo (20 levels), keyboard shortcuts, touch support
Tech Stack
Technology | Usage |
|---|---|
Vanilla JS | Core tool logic — no React, no Vue, no framework |
Canvas 2D API | Image manipulation, drawing, pixel-level processing |
WebAssembly | Video/audio processing (ffmpeg.wasm), AI inference (ONNX Runtime) |
PDF.js / jsPDF | PDF rendering and generation |
Web Audio API | Audio processing and format conversion |
Service Worker | Offline support and caching |
Tailwind CSS | Utility-first styling |
Privacy
All tools process files locally in the browser. No file is ever uploaded to any server. No accounts, no tracking cookies, no data collection. Verify it yourself — open DevTools Network tab while using any tool.
Blog
Read technical deep-dives and tool guides on the ToolKnit Blog:
What Is ToolKnit? — Full overview of all 62 tools
Changelog — Every update documented
Replies