Encode / Decode

Free online Base64 encoder and decoder with full UTF-8 (Chinese, emoji) support and a URL-safe mode. Runs 100% in your browser.

Free online URL encoder and decoder. Choose encodeURIComponent or whole-URL encodeURI, optionally use + for spaces, handles UTF-8 multibyte chars correctly. Runs in your browser.

Free online Unicode escape and unescape. Supports \u, %u and &#x; prefixes with upper/lowercase hex, handles emoji surrogate pairs correctly. Runs in your browser.

Free online HTML entity encoder and decoder. Supports named entities (& < >) and numeric entities (& / &), escapes non-ASCII too. Runs in your browser.

Free online hex and string converter. Space / 0x / comma separators, upper/lowercase toggle, UTF-8 aware, with clear validation of invalid hex input.

Free online JWT (JSON Web Token) decoder. Splits header, payload and signature, formats registered claims and shows expiry status. Parsed locally in your browser; signature is NOT verified or uploaded.

Free online GZIP compression and decompression powered by pako in your browser. Base64 or Hex output, with original/compressed size and ratio. Computed locally, nothing uploaded.