How to Use URL Encoder / Decoder

URLs (Uniform Resource Locators) can only contain a limited set of characters from the ASCII character set. Spaces, special characters, non-English letters, and many punctuation marks are not allowed directly in URLs — they must be percent-encoded to be transmitted safely.

Our free URL Encoder/Decoder tool instantly converts any text into URL-safe encoded format or decodes percent-encoded URL strings back into their original readable form.

What Is URL Encoding?

URL encoding (also called percent-encoding) converts characters that cannot appear in a URL into a safe format by replacing them with a % sign followed by two hexadecimal digits representing the character's ASCII value.

For example:

• Space ( ) becomes %20
• At sign (@) becomes %40
• Ampersand (&) becomes %26
• Equals sign (=) becomes %3D
• Plus sign (+) becomes %2B

How to Use Our URL Encoder/Decoder

1. Select Mode — Choose 'Encode' to convert text to URL-safe format, or 'Decode' to convert percent-encoded strings back to readable text.
2. Enter Your Input — Paste the URL or query parameter value you want to encode or decode.
3. Instant Conversion — The tool processes and displays the result immediately.
4. Copy the Output — Click copy to grab the encoded or decoded string for use in your application or browser.

When to Encode vs. Decode

• Encoding: Use when building URLs programmatically and need to include user-inputted values in query strings or path segments.
• Decoding: Use when you receive percent-encoded URLs and want to see the original human-readable values for debugging or display.

Common Use Cases

• Query String Parameters: When passing search terms, user names, or filter values as URL parameters, encode them to avoid breaking the URL structure.
• Form Submissions: HTML forms automatically encode data before sending, but understanding the encoding helps with manual API calls.
• API Development: Many REST APIs require properly encoded query parameters for endpoints that accept user-generated content.
• Redirect URLs: When passing a redirect URL as a parameter in another URL, it must be fully encoded.
• Analytics Tracking: UTM parameters in marketing URLs sometimes contain characters that need encoding.
• Internationalization: Non-ASCII characters (accented letters, Chinese, Arabic, etc.) must be UTF-8 encoded then percent-encoded for URLs.

URL Encoding vs. HTML Encoding

URL encoding and HTML encoding are different but related concepts:

• URL Encoding: Converts characters for safe use in URLs. Uses %XX format.
• HTML Encoding: Converts characters for safe display in HTML. Uses & < > " format to prevent XSS attacks.

encodeURI vs. encodeURIComponent in JavaScript

• encodeURI(): Encodes a complete URL, preserving characters that have special meaning in URLs (like /, ?, &, =).
• encodeURIComponent(): Encodes a URL component (like a query parameter value) more aggressively, encoding characters that have special meaning in URLs.

Always use encodeURIComponent() for individual parameter values and encodeURI() for complete URL strings when working programmatically in JavaScript.

URL encoding is a fundamental web development concept that prevents broken links, injection vulnerabilities, and parsing errors. Our free URL encoder/decoder makes it trivial to encode and decode values instantly.