6 free tools

Free Dev Tools
That Just Work

Browser-based utilities for developers. No signup, no install, no data sent anywhere. Everything runs client-side.

✓ No account required ✓ 100% client-side ✓ Mobile friendly ✓ Zero dependencies
All Tools
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JSON Formatter & Validator

Format messy JSON, validate syntax, minify for production. Syntax highlighting and inline error detection.

JSON Formatter Validator
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CSV to JSON Converter

Convert CSV files or pasted data to JSON. Custom column key mapping, instant preview, copy-to-clipboard.

CSV JSON Converter
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Regex Tester

Test regular expressions with live match highlighting. Includes a built-in library of common patterns for email, URL, IP, dates, and more.

Regex Pattern Matching JavaScript
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HTTP Status Code Reference

Look up any HTTP status code instantly. Full descriptions, use cases, and whether they're cacheable — all 70+ codes.

HTTP Status Codes Reference
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Password Generator

Generate cryptographically secure passwords. Customize length, character sets, and generate multiple at once.

Security Password Crypto
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Age & Date Calculator

Calculate exact ages, date differences, and countdowns to future dates. Precise down to days, hours, and minutes.

Date Age Calculator
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