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Free Developer Tools

JSON, Base64, regex, diff, hash, UUID, JWT, cron — 19 tools that run 100% in your browser. No signup, no tracking.

JSON Formatter

Format, validate, and minify JSON with syntax highlighting

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Base64 Encoder/Decoder

Encode text or files to Base64 and decode back

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URL Encoder/Decoder

Encode and decode URL components instantly

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Hash Generator

Generate MD5, SHA-1, SHA-256, SHA-512 hashes

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UUID Generator

Generate UUID v4 identifiers in bulk

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Timestamp Converter

Convert Unix timestamps to human-readable dates

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Diff Checker

Compare two texts and see line-by-line differences

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Regex Tester

Test regular expressions with real-time match highlighting

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Color Converter

Convert colors between HEX, RGB, HSL, and OKLCH

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Lorem Ipsum Generator

Generate placeholder text for your designs

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SQL Playground

Run SQLite queries in your browser with sample data

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JWT Decoder

Decode and inspect JSON Web Tokens with expiry check

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Cron Expression Parser

Parse cron expressions and see next execution times

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Code Beautifier & Minifier

Beautify or minify HTML, CSS, and JavaScript code

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YAML Validator

Validate YAML syntax and convert between YAML and JSON

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Markdown Editor

Write Markdown with live preview and GFM support

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cURL to Code

Convert cURL commands to JavaScript, Python, Go, and more

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JSON to TypeScript

Generate TypeScript interfaces and Zod schemas from JSON

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HTML Entities

Encode and decode HTML entities with reference table

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Developer References

Curated reference libraries for regex patterns, cron schedules, and HTTP status codes. Bookmark-worthy pages you will reach for daily.

Regex Library

25 common regular expressions with examples, variations, and plain-English explanations.

Cron Reference

20 common cron expressions with field breakdowns, next run times, and use cases.

HTTP Status Codes

30 HTTP status codes with causes, fixes, response examples, and FAQs.