%25 is the URL-encoded percent sign (%).
In a URL, %25 stands for the percent sign (%). Here is when to encode it, what it does in each part of a URL, and what every major language outputs.
Quick facts
| Character | % |
|---|---|
| Name | Percent sign |
| Unicode | U+0025 |
| UTF-8 bytes | 25 (1 byte) |
| Percent-encoded | %25 |
| Lowercase form | %25 — identical meaning |
| Double-encoded | %2525 |
| HTML form encoding | %25 |
| RFC 3986 class | Not allowed in URLs |
What it means in a URL
The percent sign introduces every escape sequence, so a literal percent in data must itself be encoded as %25. If a string is encoded twice, every % becomes %25 — that is where %2520 comes from.
RFC 3986 class: Not allowed in URLs. It is outside the characters RFC 3986 permits, so it must always be percent-encoded.
When to encode it
| Where it appears | What to do |
|---|---|
| Path segment | Encode |
| Query value | Encode |
| Fragment | Encode |
| Form body | Encode |
The mistake to watch for
Double-encoding: encoding a value that was already encoded turns %20 into %2520. Decode once more, then find the layer adding the second pass.
What each language produces
Every function in this table encodes it. Output for the single character, UTF-8 input, tested against the real runtimes (see the encoding comparator for your own strings).
| Function | Output | |
|---|---|---|
| JavaScript encodeURIComponent(s) | %25 | encoded |
| JavaScript encodeURI(s) | %25 | encoded |
| JavaScript URLSearchParams | %25 | encoded |
| Python urllib.parse.quote(s) | %25 | encoded |
| Python quote(s, safe="") | %25 | encoded |
| Python urllib.parse.quote_plus(s) | %25 | encoded |
| PHP rawurlencode($s) | %25 | encoded |
| PHP urlencode($s) | %25 | encoded |
| Java URLEncoder.encode(s, UTF_8) | %25 | encoded |
| Go url.QueryEscape(s) | %25 | encoded |
| Go url.PathEscape(s) | %25 | encoded |
| Ruby URI.encode_www_form_component(s) | %25 | encoded |
| Ruby ERB::Util.url_encode(s) | %25 | encoded |
| C# / .NET Uri.EscapeDataString(s) | %25 | encoded |
Decoding it
decodeURIComponent('%25') returns the percent sign (%). Python: urllib.parse.unquote('%25'); PHP: rawurldecode('%25'). Paste any string into the URL decoder to decode it in your browser.
← %24 Dollar sign · Full URL encoding table · %26 Ampersand →
Common questions.
%25 is the percent-encoded form of the percent sign (%), whose byte value is 0x25. Decoding the URL turns it back into the character.
Yes. Hex digits in percent-encoding are case-insensitive, so %25 and %25 mean the same thing. RFC 3986 recommends uppercase, and mixing cases can make caches and analytics count one URL as two.
Use your language’s encoder on the value: encodeURIComponent in JavaScript gives %25, Python’s quote(s, safe="") gives %25, PHP’s rawurlencode gives %25.
More from the toolkit.
About this page. Written and maintained by Sri Murugan Systems, the developer of urlencodedecode.com. Character classes follow RFC 3986 §2; language outputs were generated by running each function in its real runtime.