Is what I type sent to a server?

No. It's processed using the browser's built-in encodeURIComponent/decodeURIComponent functions.

Which characters get encoded?

Every character except letters, digits, and a handful of special characters (-_.!~*'()) is encoded as %XX.

What if decoding fails with an error?

An error message appears if the input contains a malformed % escape sequence. Check that the original encoded string is intact.

🔗 URL Encode / Decode

Convert characters and symbols to percent encoding (%XX), or decode them back.

Input

Result

How to use

Enter the text you want to encode or decode.
Click "Encode" or "Decode".
Use the copy button to grab the result.

🎯 Use Cases

Include non-ASCII or special characters in a URL query parameter — safely encode search terms or names into a querystring
Verify the URL encoding of an API request — prevent reserved characters like & = ? from breaking a request when mixed into a parameter value
Decode a mangled URL-encoded string — restore a %XX-encoded string left in a log or email back to readable text
Safely embed special characters in email or social share links — build links with spaces or symbols in the title/description without breaking them

Example

Input

https://example.com/검색?q=안녕하세요

Output

https%3A%2F%2Fexample.com%2F%EA%B2%80%EC%83%89%3Fq%3D%EC%95%88%EB%85%95%ED%95%98%EC%84%B8%EC%9A%94

Clicking "Encode" percent-encodes every reserved symbol (colon, slash, question mark) and each non-ASCII character as %XX. Because these Korean characters are 3 bytes each in UTF-8, they become three %XX pairs apiece. Running "Decode" on the output restores the original string.

encodeURI vs. encodeURIComponent

JavaScript has two URL-encoding functions. This tool uses encodeURIComponent, which is meant for encoding a single "piece" of a URL — like a query parameter value — rather than a whole URL, so it also encodes delimiter characters like : / ? & =.

Function	Characters preserved	When to use
encodeURI	Preserves URL delimiters like `: / ? # [ ] @ & = + $ , ;`	Encoding a complete, full URL
encodeURIComponent (this tool)	Only preserves `- _ . ! ~ * ' ( )`, encodes everything else	Encoding a single piece — e.g. a query parameter value

For example, encodeURI("https://a.com/search?q=1&2") leaves & and ? untouched, while encodeURIComponent encodes &, ?, and / as well. Always use encodeURIComponent when encoding a single query parameter value, so an unencoded & doesn't get mistaken for a separator between parameters.

FAQ

Is what I type sent to a server?: No. It's processed using the browser's built-in encodeURIComponent/decodeURIComponent functions.
Which characters get encoded?: Every character except letters, digits, and a handful of special characters (-_.!~*'()) is encoded as %XX.
Does a space get encoded as %20 or +?: This tool encodes spaces as %20. A + only means "space" in application/x-www-form-urlencoded (HTML form submissions) — %20 is the standard for URL paths and query parameters.
What if decoding fails with an error?: An error message appears if the input contains a malformed % escape sequence. Check that the original encoded string is intact.