encode or decode URLs and parameters

Select the appropriate coding mode

A complete link and a single parameter value require different treatment. The URL https://example.org/suche?q=SEO contains disconnectors with one function. The question mark opens the query, the equal sign separates name and value. In full URL mode, such characters are retained.

A parameter value such as SEO & Café On the other hand, it must not contain an unprotected trademark: it could be read as the beginning of another parameter. In the mode for individual values SEO%20%26%20Caf%C3%A9. Subsequently, insert this value at the designated point in the link.

Spaces, plus signs and UTF-8

Percent encoding maps bytes by one percent sign and two hex digits. An umlaut can consist of several UTF-8 bytes and therefore require several sequences. In ordinary component mode, a space becomes %20It is a real plus sign. %2B.

Form mode uses the convention of application/x-www-form-urlencoded: Spaces become plus characters; when decoding, plus characters are read as spaces again. Select this mode only for a single form value, not for a complete query with multiple names and values. A detailed comparison of the JavaScript functions offers MDN to encodeURI and encodeURIComponent.

Recognize double coding

Off %20 can be encoded again %2520 will become. The tool indicates such patterns, but does not automatically repair them: perhaps a percentage sign should be deliberately transmitted as a data value. Check which application created the value and how many decoding steps the recipient actually performs.

With “Accept as input” you can consciously prepare a further step. Check the result beforehand. Repeated decoding until “nothing remains” can expose reserved characters and change the meaning of an address.

Targeted correction of invalid inputs

A sequence such as %G1 does not contain two hex digits. Other sequences are syntactically correct, but together they do not produce a valid UTF-8. In the case of a stack, the remaining rows remain analyzable; the CSV export also contains the faulty original values.

URL encoding is neither encryption nor verification of the landing page. It does not remove tracking parameters, does not evaluate a URL structure and makes an unknown link untrustworthy. For the structure, use the SEO URL Checker; for HTTP responses the Status code Checker. Transferred links are treated here exclusively as text.

Frequent questions