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Developer Tools

Inspect, encode, validate and transform developer data locally, with standards-aware behavior and no payload added to the page address.

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Base64 Encode & Decode Convert text to Base64 and back, with full Unicode support. Hash Generator MD5, SHA-1, SHA-256, SHA-384 and SHA-512 of any text, all at once. HTML Entity Encoder & Decoder Escape HTML-sensitive text or decode named and numeric character references. JSON Formatter Format, validate, and find out exactly where it broke. JWT Decoder Inspect a JWT header and payload locally — without mistaking decoding for verification. Regex Tester Test a pattern against real text — without freezing the tab. Unix Timestamp Converter Epoch time to a date you can read, and back — in any unit. URL Encoder & Decoder Percent-encode a value or a whole URL, and decode it back again.

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About this collection

Developer utilities built for real input

The developer tools handle the details that make quick implementations unreliable: Unicode text in Base64, preserved large integers in JSON, Base64url segments in JWTs, named and numeric HTML references, and regular expressions that should not freeze a browser tab. Error messages aim to identify the actual fault rather than merely report that parsing failed.

Pasted tokens, JSON and source text stay in the current browser tab and are deliberately excluded from shareable URLs. Decoding is not the same as verification: inspect JWT claims here, but verify signatures and authorization decisions in a trusted application using the expected key and algorithm.

Other categories

Finance & Money Generators & Makers Converters & Math Health & Fitness PDF & Documents Text & Writing Business & Ecommerce Date & Time