URL Encode / Decode
Percent-encode a URL component or decode it back to UTF-8 text.
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When to use url encode / decode
- Encode a query parameter containing spaces or punctuation.
- Read a percent-encoded value while debugging.
How it works
Uses the browser’s encodeURIComponent and decodeURIComponent. Spaces become %20 and a literal plus sign becomes %2B.
Supported inputs and limits
Uses component encoding, not full-URL preservation. Slashes, colons and question marks are encoded. A plus sign is literal; it is not automatically converted to a space. Malformed UTF-8 or percent escapes are rejected.
Common questions
Should I paste an entire URL?
You can, but reserved separators will also be encoded. This tool is designed for individual components such as parameter values.
Why did + stay + when decoding?
This is URI component decoding. HTML form encoding has a separate plus-as-space convention.
Methodology reviewed 2026-09-09. Processing details and test approach.