Don't double-encode. Encoding an already-encoded string turns %20 into %2520 . If your input shows %XX sequences, decode first. Spaces aren't always %20 . In application/x-www-form-urlencoded bodies, spaces are + . This tool follows the JavaScript encodeURIComponent convention (always %20 ); decode handles both. UTF-8 vs Latin-1. Modern browsers and encodeURIComponent always use UTF-8. Some older systems still produce Latin-1 percent-escapes — those won't round-trip cleanly here. Reserved characters are case-insensitive in the percent-escape but case-sensitive in the decoded result — %2F and %2f both decode to / , but the original character's case is preserved.

URL Encoder / Decoder

Strings für URLs prozent-codieren oder zurück in Klartext decodieren.

Mode

Scope

Eingabe

Ausgabe

Geben Sie oben eine Eingabe ein, um das Ergebnis zu sehen.

What URL encoding does

URLs and HTTP headers are restricted to a small ASCII subset. Anything outside that set — including spaces, accented letters, emoji, and several reserved punctuation characters — has to be percent-encoded: replaced by % followed by two hex digits per byte. café becomes caf%C3%A9 (UTF-8). Decoding reverses that.

When to use which scope

Component — pick this for individual values you'll splice into a URL: query-string values, path segments, fragment text, header values. Encodes the structural characters / ? # & = + so they don't accidentally end up parsed as URL syntax.
Full URI — pick this for a whole URL you want to clean up. Preserves / ? # & = + as URL structure, only encodes illegal characters (spaces, non-ASCII, etc.).

Common gotchas

Don't double-encode. Encoding an already-encoded string turns %20 into %2520. If your input shows %XX sequences, decode first.
Spaces aren't always %20. In application/x-www-form-urlencoded bodies, spaces are +. This tool follows the JavaScript encodeURIComponent convention (always %20); decode handles both.
UTF-8 vs Latin-1. Modern browsers and encodeURIComponent always use UTF-8. Some older systems still produce Latin-1 percent-escapes — those won't round-trip cleanly here.
Reserved characters are case-insensitive in the percent-escape but case-sensitive in the decoded result — %2F and %2f both decode to /, but the original character's case is preserved.