Need to encode or decode URL strings for your web projects? Our free online URL encoder and decoder safely converts special characters for query parameters and web addresses to ensure maximum compatibility.
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Tip
Use encodeURIComponent() for single parameters and encodeURI() for full URLs when working in JavaScript.
Did You Know?
A space character can be encoded as either %20 or sometimes as a '+' sign in query strings.
URL encoding, also known as percent-encoding, is a mechanism for encoding information in a Uniform Resource Identifier (URI). Characters that are not allowed in a URL must be replaced by a '%' followed by two hexadecimal digits representing the character's ASCII value. This process is essential for maintaining data integrity when sending query parameters, form data, or path components over the internet, preventing browsers or servers from misinterpreting special characters as part of the URL syntax.
Best Practice
Avoid encoding unreserved characters like hyphens and underscores to keep URLs readable and SEO-friendly.
Q: What is percent-encoding? A: It is a method of representing special characters using a percent sign followed by two hex digits, ensuring they are valid within a URL.
Q: Should I encode the whole URL? A: Usually, you only encode specific parts like query parameters, as encoding the protocol (http://) or domain would break the link.
Q: Is URL encoding the same as Base64? A: No, URL encoding is specifically for URI validity, while Base64 is a binary-to-text encoding for broader data transmission purposes.
Q: Which characters are safe in URLs? A: Alphanumeric characters and a few symbols like '-', '.', '_', and '~' are unreserved and generally do not need encoding.
Tip
Always decode user-provided URLs before performing server-side validation to prevent security bypasses.