Privacy-first online tools
A tool for every task.
Your files never leave your device.
Free, private tools for images, PDFs, code, text and more — no server uploads, no sign-up.
- No server uploads
- No sign-up
- Works offline
- Files stay on your device
- No data leaves browser
Most wanted
Popular tools
Image Compressor
Shrink image file size while keeping quality high.
PDF Merger
Combine multiple PDF files into one document.
Word Counter
Count words, characters, and reading time in real time.
JSON Formatter
Format, validate, and minify JSON instantly.
Base64 Encoder & Decoder
Encode and decode Base64, with full UTF-8 support.
Color Converter
Convert colors between HEX, RGB, HSL, HSV, and CMYK.
QR Code Generator
Generate scannable QR codes for text, links, and phone numbers.
Password Generator
Generate strong, configurable passwords.
Explore
All 22 categories
From image and PDF tools to calculators, developer utilities and playful extras — every category runs entirely on your device.
Image Tools
Compress, convert, resize, crop, and edit images without uploading a single file. Every pixel is processed on your own device using the Canvas API.
PDF Tools
Merge, split, rotate, compress, and edit PDF documents entirely on your device. A private alternative to upload-based services like SmallPDF.
Text Tools
Count, transform, encode, and restyle text instantly. From word counters to classical ciphers and fancy Unicode generators.
Developer Tools
Format, validate, convert, and inspect code and data. JSON, Base64, JWT, regex, hashes, UUIDs, and dozens more developer essentials.
Color & Design Tools
Convert color formats, build gradients and shadows, check contrast, and generate harmonious palettes for your designs.
Calculator Tools
Free online calculators for finance, health, and math — including loan, mortgage, percentage, BMI, TDEE, and tax calculators, all run in your browser.
QR & Barcode Tools
Generate and read QR codes and barcodes — including WiFi, vCard, email, and SMS codes — entirely on your device.
Productivity Tools
Timers, generators, and pickers to organise your day — Pomodoro, stopwatch, password generator, to-do list, sticky notes, and more.
Audio & Video Tools
Trim audio clips and clean logos and timestamps off your own videos. Everything runs on your device, with no server uploads and no sign-up.
Web & SEO Tools
Build meta tags, structured data, sitemaps, and layout code. Practical utilities for SEO specialists and web developers.
Social Media Tools
Character counters, hashtag formatters, image resizers, and generators tuned for every major social platform.
Web Compliance Tools
Web-security basics that respect your privacy — a password strength checker that never transmits a single character you type.
Creative Tools
Drawing canvases, ASCII art, pixel editors, pattern and avatar generators — playful tools for making things.
Data Tools
View, filter, convert, and analyse CSV, JSON, and spreadsheet data without sending a single row to a server.
Miscellaneous & Browser API Tools
Hardware tests, browser info, recorders, and reaction games that tap directly into modern Web APIs.
Fun, Random & Tabletop Tools
Decision-makers, party games, and tabletop helpers — dice rollers, the Magic 8 Ball, RPG generators, and an initiative tracker.
Cooking & Kitchen Tools
Kitchen converters that take the guesswork out of recipes — cups to grams, oven temperatures, and serving sizes.
Pet & Animal Tools
Translate your pet's age into human years using modern, research-based formulas.
Travel & Lifestyle Tools
Plan trips with confidence — duration calculators, packing lists, tipping guides, and layover timers.
Music & Audio Tools
Practice aids for musicians — metronome, BPM tapper, tuner, and note-frequency references built on the Web Audio API.
Math & Education Tools
Visual math helpers — graph plotter, equation solver, matrix calculator, antiderivative, and step-by-step explainers.
Date & Time Tools
Work with dates and durations — working-day counters, countdowns, week numbers, and duration adders.
Why ToolJutsu
Built around one promise
Private by design
Your files and text are processed on your device using built-in Web APIs. Nothing is uploaded, stored, or logged on a server — because we have no server that touches your data.
Genuinely fast
No upload, no queue, no round-trip. Tools run on your own hardware and respond instantly. Once a page has loaded, most tools keep working even offline.
Free for everyone
Every tool is free, with no account and no sign-up. The site is funded by a single, unobtrusive ad per tool page — never on the homepage.
How it works
Three steps, zero uploads
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Step 1
Pick a tool
Search every tool or browse by category. No account, no install — open a tool and start.
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Step 2
Process locally
Your device does the work using built-in Web APIs and WebAssembly. Your data never leaves your device.
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Step 3
Download the result
Copy or download the output instantly. Nothing is queued, stored, or sent anywhere.
A closer look
Featured tools
A rotating selection from across all 22 categories — there is plenty more in the full directory.
Small Caps Generator
Convert text into small caps lettering.
TIF to JPG
Convert TIFF files to JPG.
ACS Citation Generator
Build ACS-style chemistry references with italic journal abbreviations — ACS Style Guide 4th ed.
Sign PDF
Draw or type a signature and stamp it onto any page of a PDF.
Ounces to Millilitres
Convert US fluid ounces (fl oz) to millilitres.
Placeholder Image Generator
Create placeholder images with custom text and colors.
Brightness & Contrast Adjuster
Fine-tune image brightness and contrast.
Macro Calculator
Calculate a daily macronutrient split.
CSS Transform Generator
Build CSS rotate, scale, and skew transforms.
CSS Beautifier
Format and indent minified CSS.
Triangle Calculator
Solve triangles from sides and angles.
Underline Text Generator
Add underline styling to text with Unicode.