Free Online Developer
Free developer tools: JSON formatter, Base64 encoder/decoder, regex tester, JWT decoder, HTML encoder, and color picker.
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JSON Formatter
Format, validate, and beautify JSON data with syntax highlighting.
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Base64 Encode/Decode
Encode text to Base64 or decode Base64 strings instantly.
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Color Picker & Converter
Pick colors and convert between HEX, RGB, and HSL formats.
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Regex Tester
Test regular expressions against text with real-time match highlighting.
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HTML Encode/Decode
Encode special characters to HTML entities or decode them back.
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JWT Decoder
Decode and inspect JWT tokens. View header, payload, and expiration.