Free Developer Tools

Speed up your development workflow with our free online developer tools. Format and validate JSON, encode and decode HTML, URLs, and Base64, generate hashes, test regular expressions, pick colors, and minify CSS and JavaScript. All tools run client-side in your browser — your code is never sent to any server, so even proprietary snippets stay private.

All Developer Tools

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JSON Formatter

Format, validate, and beautify JSON data.
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HTML Encoder/Decoder

Encode and decode HTML entities.
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URL Encoder/Decoder

Encode and decode URL strings.
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Base64 Encoder/Decoder

Encode text to Base64 and decode it back.
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Hash Generator

Generate MD5, SHA-1, SHA-256, SHA-512 hashes.
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Regex Tester

Test regular expressions with live highlighting.
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Color Picker

Pick colors and convert between HEX, RGB, and HSL.
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CSS Minifier

Minify and compress CSS to reduce file size.
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JavaScript Minifier

Minify JS code by removing whitespace and comments.
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Markdown Preview

Write and preview Markdown with live rendering.

Explore More Tool Categories

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Calculators

Percentage, BMI, loan, tip, and more calculators.
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Unit Converters

Convert temperature, length, weight, speed, and more.
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Text Tools

Count words, change case, generate slugs, and more.
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Generators

Generate passwords, QR codes, UUIDs, and more.