🧶 ToolKnit

Free Browser-Based Online Tools — No Uploads, No Signups, No Watermarks

76 tools for PDF, Image, Video, Audio, Text & Everyday Workflows

🌐 Live Site · 📖 Blog · 📋 Changelog · 🛠️ Open Source

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Every tool runs 100% client-side. Your files never leave your device. No server uploads, no accounts, no tracking cookies, no data collection. Open DevTools → Network tab to verify it yourself.

✨ Highlights

• 🔒 Privacy by Design — All processing happens in your browser via JavaScript, Canvas, WebAssembly, and Web Audio APIs
• 🆓 Completely Free — No sign-up, no watermarks, no file size limits, no premium tier
• ⚡ Instant & Offline-capable — PWA with Service Worker; works without internet after first visit
• 🌍 Multilingual — English + 中文 (Chinese) with automatic locale detection
• 📱 Responsive — Works on desktop, tablet, and mobile
• 🎯 76 Tools — PDF, Image, Video, Audio, Text, Calculators, Time, Creative, and more

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🧰 Tool Categories

📄 PDF Tools (6)

Tool	What it does
Compress PDF	Reduce PDF file size client-side
Merge PDF	Combine multiple PDFs into one
PDF to Image	Convert PDF pages to images
PDF to Word	Extract text from PDF to Word
Word to PDF	Convert Word documents to PDF
Image to PDF	Combine images into a PDF

🖼️ Image Tools (18)

Tool	What it does
Compress Image	Reduce image file size
Image Resizer	Resize images to any dimension
Crop Image	Crop images with preview
Circle Crop	Crop images into circle/oval shape
Flip Image	Flip images horizontally or vertically
Image Grid Split	Split image into grid tiles
JPG ↔ PNG	Convert between JPG and PNG
JPG ↔ WebP	Convert between JPG and WebP
PNG ↔ WebP	Convert between PNG and WebP
HEIC to JPG	Convert Apple HEIC to JPG
AI to PNG	Convert Adobe Illustrator to PNG
Pixel Art Converter	Convert images to pixel art
Background Remover	AI-powered background removal
Color Picker	Pick colors from images or palette
Gradient Generator	Create CSS gradients visually
Signature Maker	Draw digital signatures
ASCII Art	Convert images to ASCII art
ASCII Banner	Generate ASCII text banners

🎬 Video & Audio Tools (6)

Tool	What it does
Compress Video	Reduce video file size via WebAssembly
Video to GIF	Convert video clips to GIF animations
Video to Audio	Extract audio track from video
Video Screenshot	Capture frames from video files
MP3 ↔ WAV	Convert between MP3 and WAV
Noise Generator	Generate white/pink/brown noise

🎵 Music Tools (3)

Tool	What it does
MIDI Keyboard	8 timbres (Piano, Organ, Synth, Strings, Pipa, Guitar, Flute, Music Box), record & export .mid, Web MIDI output
Metronome	Precise metronome built with Web Audio API
BPM Detector	Analyze audio tempo client-side

📝 Text & Data Tools (8)

Tool	What it does
Character Counter	Count characters, words, sentences
Extract Text	Extract text from images (OCR)
Lorem Ipsum Generator	Generate placeholder text
Fancy Text Generator	Unicode text styling
JSON Formatter	Format and validate JSON
Text Diff	Compare two texts side by side
Markdown Editor	Live preview Markdown editor
Hash Generator	Generate MD5/SHA hashes

🧮 Calculators & Converters (9)

Tool	What it does
Percentage Calculator	Quick percentage calculations
BMI Calculator	Body mass index calculator
Tip Calculator	Calculate tips and split bills
Mortgage Calculator	Mortgage payment estimator
Age Calculator	Calculate exact age
Unit Converter	Convert between measurement units
Timestamp Converter	Convert Unix timestamps
Invoice Generator	Create professional invoices
Meeting Cost Calculator	Calculate meeting costs in real-time

⏰ Time & Productivity (5)

Tool	What it does
Stopwatch	Precise stopwatch with laps
Countdown Timer	Set countdown alarms
World Clock	View multiple time zones
Pomodoro Timer	Focus timer with breaks
Daily Planner	Plan your day with tasks

🎨 Creative & Fun (9)

Tool	What it does
QR Code Generator	Generate QR codes for any content
Password Generator	Create secure random passwords
Whiteboard	Draw and sketch freely
Chart Maker	Create charts and graphs
Flashcard Maker	Create study flashcards
Keyboard Tester	Test keyboard keys
Typing Speed Test	Test typing speed (WPM)
Reaction Time Test	Measure reaction speed
CPS Test	Clicks per second test

🎲 Fun & Games (6)

Tool	What it does
Random Spinner	Customizable spin wheel
Coin Flip	Virtual coin toss
Dice Roller	Roll virtual dice
What to Eat	Random food picker
Ask Fate	Magic 8-ball style answers
Aim Trainer	Improve mouse accuracy

🧠 Special (6)

Tool	What it does
Item Locator	Find items in images with AI
Emotional Neglect Test	Self-assessment questionnaire
AI Ex-Partner Chat	AI-powered conversation simulator
World Holidays Calendar	Browse global holidays

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🛠️ Tech Stack

Technology	Usage
Vanilla JavaScript	Core tool logic — no React, no Vue, no framework overhead
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, synthesis, and format conversion
Web MIDI API	MIDI device connectivity for music tools
Service Worker	Offline support and caching (PWA)
Tailwind CSS	Utility-first styling
Web Crypto API	Hash generation and secure random numbers

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🔒 Privacy

Claim	How to verify
No file uploads	Open DevTools → Network tab; zero POST requests during tool use
No user accounts	No login form, no database, no user data stored
No tracking cookies	Check Application → Cookies; only essential session cookie
No third-party analytics	Self-hosted tracker.js; no Google Analytics on tool pages
Client-side only	All source code runs in the browser; inspect any tool's JS

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📂 Open Source Standalones

Standalone versions of popular tools, ready to fork and customize:

Tool	Stack	Path
AI to PNG	PDF.js + Canvas API + JSZip	open-source/ai-to-png-standalone/
Background Remover	@imgly/background-removal (ONNX/WASM) + Canvas	open-source/background-remover-standalone/

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🗂️ Repository Structure

toolknit/
├── README.md                          # This file
├── LICENSE                            # MIT License
├── CONTRIBUTING.md                    # How to contribute
└── open-source/                       # Standalone open-source tools
    ├── ai-to-png-standalone/
    │   ├── index.html
    │   └── ...
    └── background-remover-standalone/
        ├── index.html
        └── ...

Note: The full ToolKnit website source code is hosted privately. This repository contains documentation, open-source standalone demos, and release notes.

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🤝 Contributing

We welcome contributions! See CONTRIBUTING.md for details on:

• 🛠️ Submitting new standalone tool demos
• 📝 Improving documentation
• 🐛 Reporting issues
• 🌐 Adding translations

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📰 Blog & Updates

• What Is ToolKnit? — Full overview
• Changelog — Every update documented
• Blog — Technical deep-dives and guides

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📄 License

Open-source demos in the open-source/ directory are released under the MIT License.

The ToolKnit website itself (toolknit.com) is proprietary. Tool source code is not included in this repository.

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