Quick start
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Paste URL or param
Full URLs or query values both work.
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Choose encode mode
Use component mode for param values; URI mode for full URLs.
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Copy result
Use encoded output in fetch calls or the address bar.
URL Encoder/Decoder
Encode CJK and special chars for safe URLs, or decode percent-sequences back to readable text.
Privacy: processed locally, never uploaded.
↓ Paste in the input area below to see results instantly
Scope
Enter a URL or encoded string
UTF-8 and special characters supported. Choose encode or decode.
Output
Encoded result
https%3A%2F%2Ftowalles.com%2Fsearch%3Fq%3D%E4%BD%A0%E5%A5%BD%26lang%3Dzh-CN
Notes
Encoded result
Uses encodeURIComponent，best for query parameter values (encodes ?, &, =, etc.). Full URI: https://towalles.com/search?q=%E4%BD%A0%E5%A5%BD&lang=zh-CN
Encode CJK and special chars for safe URLs, or decode percent-sequences back to readable text.
Why URL encoding matters
URLs only safely carry a subset of ASCII. CJK and spaces must become %XX sequences.
Component vs URI encoding
encodeURIComponent encodes ?, &, =; best for a single parameter value.
encodeURI keeps URL structure and encodes only illegal characters.
Typical Workflow
URL encoding is essential when developing web applications that pass parameters. For example, when a user searches for "coffee shop", the browser automatically encodes it as %E5%92%96%E5%95%A1%E5%BA%97 before sending. This tool helps verify encoding results or manually generate test cases for API debugging.
Decoding is equally common. When receiving responses like %7B%22error%22%3A%20404%7D, paste it into the tool to restore readable JSON structures. Bookmark this page for quick troubleshooting of frontend routing issues or backend parameter parsing errors.
Examples
Encode
Input
你好
Output
%E4%BD%A0%E5%A5%BD
Decode
Input
%E4%BD%A0%E5%A5%BD
Output
你好
FAQ
Decode error?
Usually invalid hex after % or a truncated string.
Same as Base64?
No. URL encoding is for addresses and query strings; Base64 is for binary-as-text.
Why do encoded URLs sometimes vary?
Encoding rules differ across languages/libraries. JavaScript encodes spaces as %20 while Python's urllib may use +. This tool follows modern browser standards (%20). Ensure consistent encoding standards between frontend and backend during debugging.