100% Free · No Sign-up · Privacy FirstMaster Your Workflow
Master Your Workflow
with ToolFu
Lightning-fast online tools that run entirely in your browser. No servers. No data collection. Just pure utility.
100% Private
Instant Results
Works Offline
developer
JSON Formatter
Format, validate, and explore JSON with a collapsible tree view. Beautify, minify, convert to TypeScript types or CSV.
general
QR Code Generator
Generate QR codes from URLs, text, WiFi, or vCards. Scan QR codes with camera. Bulk generate & download as ZIP.
general
PDF Editor
Edit PDFs in your browser. Add text, highlight, draw shapes, annotate, and save. Files never leave your device.
developer
Text Diff
Compare two texts side-by-side or inline. See additions, deletions, and changes highlighted at word or line level.
general
World Time Converter
Live clocks across timezones. Convert times, plan meetings, find working hour overlaps. Search by abbreviation.
data
A/B Test Calculator
Statistical significance with Z-test, Chi-square, Fisher, and Bayesian. Sample size & duration calculators with charts.
Your data never leaves your browser. Every tool processes data locally on your device.