URL Encoder / Decoder

About this tool

Encode or decode characters that cannot appear in URLs (full-width characters, spaces, symbols) using URL encoding. Switch between encodeURIComponent (for parts of a URL) and encodeURI (for an entire URL). An option is also available to convert spaces to +. All processing takes place locally in your browser (no data is sent).

URL encode / decode

→ Encode everything needed for URL components such as query values or individual path segments.
→ Encode only what is necessary so an existing full URL remains intact.

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Mode differences
  • encodeURIComponent is ideal for URL components (query values, path segments, fragment values, etc.). It encodes almost everything except -_.!~*'(), so characters like :, /, ?, #, &, and = are converted.
  • encodeURI should be used for complete URLs; it leaves characters meaningful in URL syntax (such as :/?#&=,+;$) untouched so protocols and separators remain valid.
  • Enable “Convert spaces to +” when you need form-compatible encoding. During decoding the tool will normalize + back to spaces.
// Example: encode "a/b?x=1 2"
encodeURIComponent("a/b?x=1 2")
// → "a%2Fb%3Fx%3D1%202"

encodeURI("https://ex.com/a/b?x=1 2")
// → "https://ex.com/a/b?x=1%202"   (:/?= stay, only the space becomes %20)

Notes

  • Use encodeURIComponent for parts of a URL, and encodeURI for whole URLs.
  • + is often treated as a space in form submissions (this tool normalizes it to a space when decoding).
  • The encoded length can change significantly, especially for multi-byte UTF-8 characters.