Free Online Developer Tools
Fast, privacy-friendly utilities that run entirely in your browser. No signup, no uploads — your data never leaves your device.
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JSON Formatter
Format, validate, and minify JSON instantly with error detection.
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Regex Tester
Test regular expressions with live match highlighting.
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Base64 Encode / Decode
Convert text to and from Base64 in one click.
JWT
JWT Decoder
Decode and inspect JSON Web Token headers & payloads.
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Timestamp Converter
Convert Unix timestamps to human dates and back.
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UUID Generator
Generate v4 UUIDs individually or in bulk.