URL Encoder Decoder

Special characters like spaces, question marks, and ampersands have specific meanings in URLs. Encoding converts them to percent-hex tokens so they transmit safely.

encodeURI keeps reserved URL structure characters (like ://?&) intact, while encodeURIComponent escapes them too — use it for individual parameter values.

That is double-encoding: an already-encoded string was encoded again. Decode it twice, or start from the original raw value.

Yes, full UTF-8 — letters like é, ñ, or 中文 are percent-encoded as multi-byte sequences and decoded back exactly.

Paste the value into the encoder and it percent-encodes reserved characters like &, =, spaces, and non-ASCII bytes, producing a value that survives being embedded in a query string.

Double-encoded input is the usual culprit — a literal '%2520' decodes once to '%20'. Decode the string repeatedly until no percent-escapes remain.

Yes. Text is converted to UTF-8 bytes first, so multi-byte characters round-trip correctly through both encode and decode.