Free Developer Converters & Encoders
The everyday encode/decode utilities developers reach for. Base64 and URL encode/decode, decode JWTs, generate UUIDs and hashes, test regular expressions, and diff two blocks of text — all client-side and instant.
- Base64 EncoderEncode UTF-8 text to Base64 instantly in your browser with byte-size stats.
- Base64 DecoderDecode Base64 strings back to UTF-8 text instantly in your browser with byte-size stats.
- URL Encoder / DecoderEncode or decode URL strings with encodeURI or encodeURIComponent, entirely in your browser.
- JWT DecoderDecode JSON Web Tokens to inspect the header, payload, and claims instantly in your browser — no data leaves your device.
- UUID GeneratorGenerate RFC 4122 UUID v4 identifiers in bulk with optional uppercase and hyphen formatting.
- Hash GeneratorGenerate MD5, SHA-1, SHA-256, SHA-384, and SHA-512 hashes from text instantly in your browser.
- Regex TesterTest regular expressions live against sample text with flags, match details, and replace preview.
- Diff CheckerCompare two texts and highlight added, removed, and changed lines or words instantly in your browser.
Frequently asked questions
- Is it safe to decode a JWT here?
- Yes. JWT decoding happens in your browser. That said, never paste production tokens containing live secrets into any online tool.
- Do these encoders support Unicode?
- Yes. The Base64 and URL tools handle full UTF-8 text, including emoji and non-Latin scripts.