Toolbox

A collection of free online tools for developers and daily use. All tools run directly in your browser — no registration, no data collection, completely free.

Calculator

Simple four-function calculator for quick arithmetic. Supports addition, subtraction, multiplication, and division.

JSON Formatter

Format, minify, and validate JSON data. Perfect for debugging API responses and configuration files.

Base64 Tool

Encode text to Base64 or decode Base64 back to plain text. Full UTF-8 support including Chinese and emoji.

Timestamp Converter

Convert Unix timestamps to human-readable dates and vice versa. Supports both seconds and milliseconds.

URL Tool

Encode special characters for URLs or decode percent-encoded strings. Essential for web development.

No installation required. No account needed. Your data never leaves your browser.

All tools are free and open to use for everyone.