URL Encoder/Decoder
Encode special characters for safe URL transmission. Perfect for query strings, form data, and URL parameters.
Conversion Guide
Conversion
E
Encode
Character → %XX
Convert special characters to % followed by hex code
D
Decode
%XX → Character
Convert %XX codes back to original characters
Step-by-Step Scenario
Example Scenario
Input
Hello World
1
Identify Special Characters
- Space character needs encoding
Identify characters that need URL encoding
2
Encode
- Space (ASCII 32) = %20
Additional Examples
Query Parameter
Text: name=John Doe
Encoded
name=John%20Doe
Special Characters
Text: a & b
Encoded
a%20%26%20b
Characteristics of URL Encoding
Safe Transmission
URL encoding ensures special characters are safely transmitted in URLs. Prevents URL parsing errors and security issues.
Percent Encoding
Uses percent encoding format (%XX) where XX is the hexadecimal ASCII code. Standard format for URL encoding.
Bidirectional
Encode text for URLs or decode URL-encoded strings back to text. Essential for processing URL parameters.
Query Strings
Essential for query strings, form submissions, and URL parameters. Ensures data is properly transmitted in URLs.
Important Notes
- URL encoding converts special characters to %XX format where XX is the hexadecimal ASCII code. For example, space (32) becomes %20.
- Characters that need encoding: space, &, =, ?, #, /, and non-ASCII characters. Alphanumeric and some safe characters (-, _, ., ~) don't need encoding.
- Always encode URL parameters and query string values. This prevents parsing errors and ensures special characters are transmitted correctly.
- The calculator uses encodeURIComponent which encodes more characters than encodeURI. This is appropriate for URL components like query parameters.
- URL encoding is different from HTML encoding. URL encoding is for URLs, HTML encoding is for HTML documents.
Frequently Asked Questions
Find answers to common questions about URL encoding and decoding.
URL encoding (percent encoding) converts special characters to %XX format for safe transmission in URLs. Space becomes %20, & becomes %26, etc. Each character is encoded as % followed by two hexadecimal digits.
Use URL encoding when passing data in query strings, form submissions, or any URL parameter that may contain special characters. Essential for proper URL construction.
Special characters like space, &, =, ?, #, /, and non-ASCII characters need encoding. Alphanumeric characters (A-Z, a-z, 0-9) and some safe characters (-, _, ., ~) don't need encoding.
URL encoding converts each special character to % followed by two hexadecimal digits representing the character's ASCII code. For example, space (ASCII 32) becomes %20.
Yes, the calculator can decode URL-encoded strings back to their original text. This is useful when processing URL parameters or query strings.
encodeURI encodes the entire URI but preserves some characters. encodeURIComponent encodes a component (like a query parameter) and encodes more characters. This calculator uses encodeURIComponent.