What is URL Encoding?
URL encoding, also known as percent-encoding, is a mechanism for encoding information in a Uniform Resource Identifier (URI). It converts characters that are not allowed in URLs or have special meaning into a format that can be safely transmitted. The encoding replaces unsafe characters with a "%" followed by two hexadecimal digits representing the character's ASCII code.
How to Use This Tool
- Select Mode - Choose "Encode" to convert text to URL-safe format, or "Decode" to convert back.
- Enter Text - Type or paste your URL or text in the input field.
- Choose Encoding Type - Select Standard, Plus, or Component mode based on your needs.
- Click Convert - Press the button to encode or decode your text.
- Copy Result - Click "Copy" to copy the result to your clipboard.
Encoding Modes Explained
Standard
Preserves URL-safe characters like /, :, ?, &, =. Best for encoding full URLs.
Plus (+)
Encodes spaces as + instead of %20. Common in form data (application/x-www-form-urlencoded).
Component
Encodes everything except alphanumeric characters. Use for query parameter values.
Why URL Encoding Matters
- Data Integrity - Ensures special characters don't break URLs or cause security issues.
- Universal Compatibility - Makes URLs work across all browsers and servers.
- API Requests - Required when sending data through query strings.
- Form Submissions - HTML forms automatically encode data for transmission.
- Security - Prevents injection attacks and URL manipulation.
FAQ
Why are spaces encoded as %20 or +?
%20 is the standard encoding, while + is used specifically in query strings (form data). Both represent a space character.
Do I need to encode the entire URL?
Usually only query parameters need encoding. The URL path can use standard encoding which preserves /, :, and other URL-safe characters.
What happens if I double-encode a URL?
Double encoding converts % to %25, which can cause issues. For example, %20 becomes %2520. Always decode before re-encoding.