URL encoder & decoder

Ready

Percent-encode text for URLs or decode it back, as a single value (encodeURIComponent) or a whole address (encodeURI), with an option for + as space. Query parameters are listed when decoding.

Files you choose are processed entirely in this browser and are never uploaded to a server.

How to use

Choose encode or decode and paste your text.
When encoding, choose whether it’s a single value or a whole URL.
Tick the + option for HTML form encoding. When decoding, query parameters are shown in a table.

Formula

Characters outside the unreserved set (A–Z a–z 0–9 - _ . ~) become %XX for each UTF-8 byte

Worked example

café & bar → caf%C3%A9%20%26%20bar

FAQ

Single value or whole URL?

Encode a single value when you put it inside a query string – it also encodes & = ? / #. Encode a whole URL to keep its structure (https://, ?, &, =) and only convert spaces and non-ASCII characters.

Why do I get an error when decoding?

There’s a % that isn’t followed by two hex digits, or the bytes aren’t valid UTF-8. The error tells you where.

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