URL Encoder / Decoder
Encode text as a URL component or decode percent notation and form-style plus signs. The controls help inspect a query value without validating a whole address.
- Runs in your browser
- Nothing is uploaded
- No signup; device limits apply
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How to use this tool
Choose encoding or decoding and enter the value. This decoder first changes + to a space, so represent a literal plus as %2B when it must survive decoding.
Results and examples
Decoding a+b yields a b, while a%2Bb yields a+b. Encoding uses encodeURIComponent, which can turn separators in a complete URL into characters inside one value.
Limitations
- Malformed percent encoding can produce an error.
- The decoder’s plus handling means every component string does not necessarily round-trip unchanged.
Fields
| Field | Guidance and constraints |
|---|---|
| Input | Check the unit and format displayed beside this field. |
| Result | Check the unit and format displayed beside this field. |
Data handling
Processing stays in the current browser tab; the site does not upload tool input for the calculation itself.
Sources
Frequently asked questions
How do I preserve a literal plus?
Decoding a+b yields a b, while a%2Bb yields a+b. Encoding uses encodeURIComponent, which can turn separators in a complete URL into characters inside one value.
Should I enter the entire URL?
Malformed percent encoding can produce an error. The decoder’s plus handling means every component string does not necessarily round-trip unchanged.
