URL Encoder/Decoder
Encode and decode URLs and query parameters.
Key Features
- Encodes special characters in URLs and query parameters to their percent-encoded equivalents.
- Decodes percent-encoded URLs back to human-readable form.
- Encodes full URLs while preserving the protocol, slashes, and domain structure.
- Offers a query-string-only mode that encodes individual parameter values.
- Runs entirely in the browser — no data is transmitted to any server.
- Handles international characters and Unicode correctly in both directions.
Frequently Asked Questions
Why do I need to encode a URL?
URLs can only contain a limited set of ASCII characters. Spaces, accented letters, and special symbols must be percent-encoded (e.g. space becomes %20) so browsers and servers interpret them correctly.
What is the difference between encodeURI and encodeURIComponent?
encodeURI encodes a full URL while leaving structural characters like / and ? intact. encodeURIComponent encodes everything including those characters, and is correct for encoding individual query parameter values.
Is my URL data sent to a server when I encode it?
No. Encoding and decoding run entirely in your browser. Your URL data is never transmitted anywhere.