UtilityBaseDeveloper Tools
Developer tools cover the quick conversions that interrupt real work: pretty-printing a JSON blob from a log, decoding a Base64 token, URL-encoding a query parameter, and translating Unix timestamps into readable dates. All processing is local, which matters when the data you're inspecting is sensitive.
JSON Formatter
Format, validate, and minify JSON with precise error locations.
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Color Contrast Checker
Check WCAG contrast ratios between text and background colors — AA and AAA.
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Hash Generator
Generate SHA-1, SHA-256, SHA-384, and SHA-512 hashes from any text, live.
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CSV to JSON Converter
Convert CSV to JSON and JSON back to CSV — quotes and commas handled properly.
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Binary Translator
Convert text to binary and back, plus a decimal/hex/binary/octal converter.
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JWT Decoder
Decode JWT tokens locally — header, payload, and human-readable claims.
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Discord Timestamp Generator
Create Discord <t:…> timestamp codes that show in everyone's own time zone.
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Timestamp Converter
Convert Unix timestamps to human dates and back — seconds or milliseconds.
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Cron Expression Explainer
Type a cron expression and get plain English — '0 9 * * 1-5' explained instantly.
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Base64 Encoder / Decoder
Encode text to Base64 or decode it back — full Unicode support.
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URL Encoder / Decoder
Percent-encode text for URLs or decode encoded URLs back to readable text.
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Frequently asked questions
Is it safe to paste API responses or tokens here?
All developer tools run entirely in your browser and transmit nothing. That said, treat production secrets carefully anywhere — including your clipboard.