URL Encoder / Decoder
Encode or decode URLs and query strings. Supports component and full URL encoding. All processing happens locally in your browser.
When to use URL encoding
encodeURIComponent — Use for query parameter values, form data, and path segments. Encodes all special characters including ? & = / #.
encodeURI — Use for encoding a complete URL while preserving its structure (:// / ? & = # remain intact).
Common mistake: Using encodeURIfor query strings won't encode & and =, which can break parameter parsing.
All encoding and decoding happens in your browser — no data is uploaded anywhere.