Dev Combo — URL / Base64 / JWT / Hash Encoder & Decoder

Four essential dev tools in one page: URL encode/decode, Base64 encode/decode, JWT inspector (decode header + payload, no verify), and SHA-256 / SHA-512 hashing. All client-side.

Common use cases

  • URL encoding: query strings, URL fragments, API parameters
  • Base64: inline images in CSS / email, Basic Auth headers
  • JWT decoding: debugging token contents (never trust an unverified JWT!)
  • SHA hashing: file integrity, tamper-detection, password pre-processing