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100% free, browser-based, your files never leave your device.
ToolKnit is a free website that gives you 86 online tools and a calendar of 3,400+ world holidays —from compressing a PDF to making a CSV chart to checking when Diwali falls in 2027 —and runs every single one entirely inside your browser. Your files never leave your device.
Why ToolKnit exists
Most "free" online tool sites follow the same pattern: you upload a file to their server, wait while they process it, and download the result —often after a signup wall, a file-size limit, or a watermark. Your files sit on someone else's machine, and you have no real way to verify what happens to them.
ToolKnit takes a different approach. Every tool on the site processes files locally in your browser using JavaScript, WebAssembly, and native browser APIs. When you compress a PDF on ToolKnit, the compression happens on your own device. When you convert an image format, the pixels are decoded and re-encoded by your browser's Canvas API. Nothing touches a remote server because there is no remote server for file processing.
This means:
- No signup required —there are no user accounts on ToolKnit at all.
- No file size throttling —processing limits are your device's memory, not an artificial paywall.
- No watermarks —output files are clean.
- No waiting in a queue —work starts instantly in your browser tab.
- Full privacy —files stay on your device from start to finish.
How many tools does ToolKnit have?
As of June 2026, ToolKnit offers 86 free tools organized into 10 categories: PDF, Image, Video, Audio, Text, Calculator, Time & Productivity, Creative & Fun, AI Tools, and Self-Test — plus a brand-new World Holidays Calendar covering 3,400+ public, cultural and religious holidays across 122 countries for 2026 and 2027. Every tool works on desktop, tablet, and mobile browsers.
PDF Tools
ToolKnit's PDF tools handle the most common document tasks without requiring Adobe Acrobat or any installed software. They use pdf-lib (WebAssembly) to manipulate PDF structures directly in the browser.
Compress PDF reduces file size by downsampling embedded images and stripping unused metadata. Merge PDF combines multiple documents into one with drag-and-drop reordering. PDF to Image renders each page as a high-resolution PNG or JPEG. Image to PDF converts one or more images into a multi-page PDF. PDF to Word and Word to PDF handle format conversion for documents.
Image Tools
ToolKnit covers image compression, format conversion, cropping, resizing, and creative effects. All image processing uses the Canvas API and OffscreenCanvas for hardware-accelerated rendering.
Compress Image reduces JPEG, PNG, and WebP file sizes with adjustable quality. Background Remover cuts out subjects with automatic detection plus manual brush refinement. HEIC to JPG makes iPhone photos easier to share and upload anywhere. AI to PNG converts supported Adobe Illustrator files into browser-generated PNG exports. The six format converters handle the most common web image conversions —useful when a platform only accepts certain formats. Image Crop gives you freeform and aspect-ratio-locked cropping. Image Grid Split slices a photo into equal tiles (useful for Instagram carousels). Image Resizer lets you set exact dimensions or scale by percentage. Pixel Art Converter turns any photo into retro pixel art with adjustable resolution, color palettes, dithering, and presets like Game Boy and NES. Flip & Rotate Image mirrors your image horizontally or vertically and rotates by 90°, 180°, or 270° with instant preview and PNG/JPG download.
Video Tools
Video processing in the browser is powered by native browser APIs like the Canvas API and MediaRecorder, plus the Web Audio API for sound. ToolKnit can compress, convert, and extract from video files without sending them to any server or downloading a heavy engine.
Compress Video uses browser-native encoding (Canvas + MediaRecorder) to compress MP4, WebM, and MOV files in real time — the video plays, and compression finishes at the same speed, with no WASM engine download. Video to GIF converts any video clip to an animated GIF by capturing frames during real-time playback, avoiding the classic "stuck at 50%" seeking problems and giving smooth, timing-accurate GIFs. Video Screenshot lets you step frame-by-frame through any video and capture lossless HD screenshots as PNG, JPEG, or WebP. Video to Audio extracts audio using a dual strategy: fast decode to WAV when the codec is supported, and a Web Audio + MediaRecorder real-time capture fallback that handles formats the decoder can't read, outputting WAV, WebM/Opus, or M4A depending on the browser.
Audio Tools
Audio conversion uses the Web Audio API and AudioContext for decoding and re-encoding between formats.
MP3 to WAV decodes compressed MP3 audio into lossless WAV format. WAV to MP3 compresses WAV files into smaller MP3 files with adjustable bitrate. Metronome is a precise BPM trainer built on the Web Audio API with tap tempo, multiple time signatures, and subdivisions for music practice. BPM Detector analyzes any audio file to find its tempo, with waveform visualization and beat markers. All audio processing happens entirely in the browser.
Text Tools
ToolKnit's text tools help with writing, content creation, and document processing.
Character Counter gives real-time counts for characters, words, sentences, paragraphs, and reading time —useful for social media limits and SEO meta descriptions. Lorem Ipsum Generator creates placeholder text in paragraphs, sentences, or words. Extract Text uses OCR (optical character recognition) to pull text from images and scanned documents. QR Code Generator creates scannable QR codes from any URL or text with customizable size and error correction levels. Password Generator creates strong, random passwords using the Web Crypto API with customizable length (4–128 characters), character types, real-time strength analysis, and bulk generation up to 50 passwords at once. Text Diff compares two texts line by line and highlights additions, deletions, and unchanged lines with unified or side-by-side view modes.
Calculator Tools
Everyday math and measurement calculators that run entirely in your browser.
Age Calculator computes your exact age in years, months, and days, plus zodiac sign and birthday countdown. Unit Converter converts between length, weight, temperature, volume, and more with real-time results. Percentage Calculator handles three modes: percent of a number, percentage change, and ratio. BMI Calculator calculates your Body Mass Index from height and weight with metric and imperial support, a visual BMI bar, and WHO category classification. Tip Calculator splits restaurant bills with custom tip percentages, per-person breakdown, and preset quick-select buttons. Mortgage Calculator estimates monthly payments with principal & interest breakdown, full amortization schedule, and interactive charts.
Time & Productivity Tools
Simple, distraction-free utilities for timing and scheduling.
Stopwatch tracks elapsed time with millisecond precision, lap splits, and session history. Countdown Timer counts down from any duration with audio alerts and preset buttons. World Clock shows current time across multiple time zones side by side, useful for scheduling calls across continents. Pomodoro Timer manages focus and break intervals with customizable durations and audio notifications. Invoice Generator creates professional PDF invoices with line items, tax calculations, and instant download. Timestamp Converter converts between Unix epoch timestamps and human-readable dates with a live clock, supporting both seconds and milliseconds.
Creative & Fun Tools
Interactive tools for decision-making, gaming practice, drawing, and random generation.
Whiteboard is a full-featured drawing canvas with pen, eraser, shapes, text, and export to PNG. Random Spinner Wheel lets you add custom options and spin to pick one. What to Eat? suggests a random meal when you can't decide. Ask Fate gives Magic 8-Ball style answers to yes-or-no questions.
Keyboard Tester detects stuck, broken, ghosting, and double-firing keys with a visual layout. Reaction Time Test measures how fast you can respond to a visual signal. Aim Trainer helps practice FPS aim with adjustable speed and target count. CPS Test measures clicks per second across multiple durations (1s, 5s, 10s, 30s, 60s).
Coin Flip simulates a realistic coin toss with 3D animation, streak tracking, and probability stats. Dice Roller rolls 1–6 dice with animation, distribution chart, and roll history. Color Picker lets you pick any color visually, convert between HEX, RGB, and HSL, generate palettes (complementary, analogous, triadic, and more), and extract colors from uploaded images.
Signature Maker creates transparent PNG signatures by drawing or typing your name. Flashcard Maker lets you create local study decks, flip through cards, quiz yourself, import CSV/TXT pairs, and export JSON backups without uploading anything. CSV Chart Maker turns pasted spreadsheet data into bar, line, pie, doughnut, radar, and scatter charts, then exports PNG images or standalone interactive HTML previews.
Self-Test Tools
Psychology and relationship tools for self-reflection. 100% private — results never leave your browser.
Emotional Neglect Test is a 40-question assessment based on attachment theory, measuring 5 dimensions (Emotional Responsiveness, Expression, Being Valued & Seen, Self-Regulation, Relational Patterns) with a radar chart and detailed profile. AI Ex-Partner Chat lets you distill your ex-partner's personality from chat records (WeChat, QQ, WhatsApp, Telegram, Douyin) into an AI persona you can talk to — using your own DeepSeek API key, with all data staying local in your browser.
The technology behind ToolKnit
ToolKnit is a static website —no backend server, no database, no API. Every page is plain HTML, CSS, and JavaScript served from a CDN. Here's what powers the tools under the hood:
- pdf-lib (WebAssembly) —PDF manipulation: compression, merging, page extraction, metadata editing.
- FFmpeg.wasm —Video compression, format conversion, and GIF creation, all in the browser.
- Canvas API / OffscreenCanvas —Image decoding, encoding, resizing, cropping, and format conversion.
- Web Audio API —Audio decoding and encoding for MP3/WAV conversion and video audio extraction.
- Tesseract.js —Browser-based OCR for extracting text from images.
- Tailwind CSS —Utility-first styling for a consistent, responsive UI across all tools.
- Service Worker —Enables offline access via cached pages and assets (Progressive Web App).
The site loads no third-party tracking scripts beyond Google Analytics and Ahrefs analytics. There are no ads, no affiliate links, and no pop-ups.
Privacy and data handling
ToolKnit's privacy approach is simple: your files never leave your device. There is no server-side processing, no cloud storage, and no temporary file hosting. When you select a file in any tool, it is read by your browser's File API and processed entirely in local memory. The output file is generated locally and downloaded directly to your device.
ToolKnit does not collect personal information. There are no user accounts, no email collection, no cookies for tracking individual users. The only data stored locally is a daily usage counter in your browser's localStorage (to enforce the 500 uses/day fair-use limit) and optional personal bests for gaming tools like CPS Test.
For the full details, see the Privacy Policy and Terms of Service.
Works offline
ToolKnit is a Progressive Web App (PWA). When you visit the site, a service worker automatically caches all tool pages and core assets. After the first visit, you can use most tools even without an internet connection. On mobile, you can add ToolKnit to your home screen and launch it like a native app.
How ToolKnit compares to other online tool sites
Most competing sites (iLovePDF, SmallPDF, CloudConvert, Convertio, etc.) upload your files to their servers for processing. Some are free for limited use and charge for larger files or batch operations. Here's how ToolKnit differs:
- No file uploads —competitors process on their servers; ToolKnit processes in your browser.
- No account required —most competitors require signup for full access.
- No file size limits —the only limit is your device's available memory.
- No watermarks —some competitors add watermarks to free-tier output.
- Offline capable —most competitors require an internet connection; ToolKnit works offline.
- Wider variety —beyond PDF and image tools, ToolKnit includes creative tools, gaming tests, timers, and decision-makers that most file-conversion sites don't offer.
The trade-off is that browser-based processing can be slower than server-side processing for very large files (e.g., 500 MB videos), and some advanced features (like PDF OCR with perfect formatting) work better with server-side AI. For everyday tasks —compressing a PDF, converting an image, timing something, or making a quick decision —ToolKnit handles it instantly and privately.
Frequently asked questions
What is ToolKnit?
ToolKnit is a free website at toolknit.com that offers 86 browser-based online tools for working with PDFs, images, videos, audio, text, charts, study cards, and more. Every tool runs entirely in your browser —no files are uploaded to any server, and no account is required.
Is ToolKnit really free?
Yes. All 86 tools are completely free. There are no paid tiers, no watermarks, and no feature locks. Each tool allows up to 500 uses per day per device, tracked locally in your browser.
Does ToolKnit upload my files?
No. ToolKnit processes all files locally in your browser using JavaScript, WebAssembly, and browser APIs. Your files never leave your device.
Do I need to create an account?
No. ToolKnit does not have user accounts, logins, or registration. You can use any tool instantly by visiting the page.
Does ToolKnit work on mobile?
Yes. ToolKnit is fully responsive and works on phones, tablets, and desktops. You can also install it as a PWA on your home screen.
Can I use ToolKnit offline?
Yes. After visiting the site once, most tools are cached by a service worker and can be used without an internet connection.
What browsers does ToolKnit support?
ToolKnit works on all modern browsers: Chrome, Firefox, Safari, Edge, and their mobile equivalents. Some WebAssembly-heavy tools (like video compression) perform best on Chrome or Edge.
World Holidays Calendar (NEW — May 2026)
ToolKnit's newest feature isn't a file-processing tool —it's a reference. The World Holidays Calendar indexes 3,470 public, cultural and religious holidays across 122 countries for 2026 and 2027. You can:
- Search globally — type "Diwali", "Japan", or "December" and the list filters instantly.
- Filter by region, country, month, type and year — narrow 3,400+ entries down to exactly what you need.
- Copy any date with one click — pastes as
YYYY-MM-DD — Name (Country). - Browse 15 dedicated country pages — United States, United Kingdom, Canada, Australia, Japan, China, India, Germany, France, Brazil, Mexico, Singapore, Philippines, South Korea, Thailand —each with month chips, search, and a country-specific description.
The dataset is built on the open Nager.Date public-holiday API plus ~50 curated cultural and religious holidays (Diwali, Lunar New Year, Eid, Hanukkah, Mid-Autumn Festival, etc.) that pure public-holiday datasets miss. Like everything else on ToolKnit, it runs entirely in your browser —no server calls, no tracking, no signup. Read the deep-dive for the full data-sourcing story and country highlights.
Try ToolKnit
Whether you need to compress a PDF, convert an image, shrink a video, count characters, time something, make flashcards, build a CSV chart, or flip a coin —ToolKnit has a free, instant, browser-based tool for it. No signup, no uploads, no cost. Just open the tool and start.