URL Encoder & Decoder
Safely encode and decode URL components. 100% browser-based and secure.
How to use this tool
Select Mode
Choose "Encode" for plain text or "Decode" for URL-encoded strings.
Enter Input
Enter the URL component or text in the text area.
Copy result
Get your result immediately and copy it with one click.
URL Encoding & Decoding Explained
URLs can only be sent over the internet using the ASCII character set. When a URL contains characters outside this set — such as spaces, accented letters, or special symbols like&, =, and ? — they must be "percent-encoded" (replaced with a % followed by their hexadecimal byte values). Our URL encoder and decoder handles this conversion instantly and correctly.
Why URL Encoding Matters
- Query Parameters: When building URLs with user-generated content (search queries, form data), special characters must be encoded to avoid breaking the URL structure.
- API Integration: Many REST APIs require parameter values to be percent-encoded. A missing encoding can cause silent failures or security vulnerabilities.
- Internationalization: Non-ASCII characters in URLs (Japanese, Arabic, accented Latin) require proper encoding to be transmitted correctly across all systems.
- Security: Proper encoding prevents injection attacks by neutralizing special characters that could be interpreted as URL delimiters.
How It Works
Our tool uses JavaScript's encodeURIComponent() and decodeURIComponent()functions to handle the conversion. encodeURIComponent encodes everything except letters, digits, and the characters - _ . ! ~ * ' ( ), making it the correct choice for encoding individual URL parameters. All processing happens locally in your browser.
Common Examples
Hello World → Hello%20Worlduser@example.com → user%40example.comprice=100¤cy=€ → price%3D100%26currency%3D%E2%82%AC