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Developer Tool
URL Encoder
Encode and decode URL text and edit query parameters. Switch instantly between component/full URI modes and UTF-8 and EUC-KR charsets (for legacy Korean URLs).
URL encoder guide
What is URL encoding?
URL encoding converts special characters into percent-encoded sequences starting with '%'. For example, a space becomes %20, and & becomes %26. This makes it safe to pass text in URLs.
How to use it
1. Choose the encode or decode direction. 2. Type text and the result appears instantly. 3. Switch between Component / Full URI mode and the UTF-8 / EUC-KR charset as needed. 4. You can also edit key=value pairs directly in the query-parameter table. Copy the result to use it right away.
Component vs Full URI
Component mode is used for encoding query parameters or hash fragments—it encodes reserved characters like /, :, and ?. Full URI mode is for complete URLs—it preserves the URL structure characters (/, :, ?) so the URL remains valid.
UTF-8 vs EUC-KR
Most modern websites and systems use UTF-8. However, older Korean sites and legacy systems may use EUC-KR (CP949). For example, %C7%D1 is an invalid UTF-8 sequence, but when decoded as EUC-KR, it becomes the Korean character '한'.
When to use it
Safely encoding a link when it contains Korean, spaces, or special characters that would otherwise break it, decoding a URL full of '%' from somewhere else back into readable text, checking or editing query parameters like utm_source, or making sense of an address from an older Korean site that was encoded in EUC-KR.
Tips and gotchas
Use Component mode when you're only handling the query value after the question mark, and Full URI mode for a complete address. If the result shows garbled Korean, switch the charset (UTF-8 ↔ EUC-KR). Encoding and decoding are not encryption, so don't rely on them to protect sensitive information.
FAQ
Why is URL encoding necessary?
Certain characters in URLs (space, &, %, etc.) have special meaning. Encoding them makes it safe to transmit data within URLs.
What's the difference between Component and Full URI mode?
Component mode encodes the values in query strings like ?name=hello&age=30. Full URI mode encodes a complete URL like https://example.com/path?a=1 while preserving the URL structure (/, :, ?).
What is EUC-KR?
EUC-KR (Extended Unix Code for Korean) is a character encoding for Korean text, also known as CP949. It was widely used by Korean websites in the early 2000s.
What happens if I encode already-encoded text?
It gets double-encoded. For example, %20 becomes %2520. This tool warns you if it detects %xx patterns.
What does the Query String Editor do?
It parses query strings like ?name=Alice&age=30 into a table. Edit the values and click 'Rebuild query string' to get the encoded result.
Where is my input data stored?
All processing happens locally in your browser. Nothing is sent over the network or stored on a server. Only the 10 most recent inputs are saved in localStorage, and you can clear them anytime.