URL Encoder / Decoder
Encode a URL component or a complete URI and decode percent-encoded text.
—
Complete guide to URL Encoder / Decoder
Tool Overview
The URL Encoder / Decoder converts characters into percent-encoded form so they can be safely included in URLs, query strings, and web requests. It can also decode percent-encoded sequences back into readable text. For example, a space may appear as %20, and non-ASCII characters are represented through encoded byte sequences.
URLs have a defined syntax in which characters such as ?, &, =, #, /, and % can carry structural meaning. Encoding ensures that a value containing reserved characters is treated as data rather than accidentally changing the structure of the URL.
Why Encode URLs?
When user input, search terms, redirect destinations, filenames, or parameter values contain spaces or special characters, inserting them directly into a URL can produce invalid or ambiguous addresses. Proper encoding protects the intended value during transmission.
Different URL components require different treatment. Encoding an entire URL with a function intended for a query parameter can encode structural characters that should remain untouched. Developers should therefore distinguish between encoding a full URI and encoding an individual component or parameter value.
Use Cases
- Encode a query parameter containing spaces or accents.
- Decode a URL copied from an analytics report.
- Inspect percent-encoded redirects or tracking links.
- Prepare safe parameter values for web requests.
- Debug URLs containing %20, %2F, %3F, or similar sequences.
- Convert readable text into a URL-compatible representation.
Frequently asked questions
What is percent encoding?
It represents certain bytes as % followed by two hexadecimal digits, allowing reserved or non-ASCII characters to travel safely in a URL.
Why is a space sometimes + instead of %20?
In application/x-www-form-urlencoded query data, spaces are commonly represented with +. In general URI percent encoding, %20 is the direct representation.
Should I encode an entire URL?
Usually you should encode only the component that needs encoding. Encoding the full URL indiscriminately can break separators such as :, /, ?, and &.
Can decoding a URL change its meaning?
Decoding reveals the original characters represented by encoded sequences. Always review the full URL because encoded characters can include reserved separators or unexpected content.
Is URL encoding a security feature?
It is a transport and syntax mechanism, not encryption. Encoded values remain visible and should not be treated as secret.