URL Encoder / Decoder
Encode or decode URLs and query parameters instantly
Your encoded/decoded URL
will be displayed here.
Example URLs
Click on any example to load it into the input field, or use "Quick Run" to automatically convert:
Query Parameters
name=John Doe&email=john@example.com&message=Hello World!
URL with Special Chars
https://example.com/search?q=hello world&category=开发工具
API Endpoint
https://api.example.com/users?filter=name='test'&sort=desc
What is URL Encoding?
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 special characters into a format that can be transmitted over the Internet. Our free online URL encoder/decoder helps you convert URLs and query parameters instantly without any installation or signup.
⚡Technical Implementation
JavaScript Functions
Algorithm Details
- • Converts characters to UTF-8 bytes
- • Each byte becomes %XX (hexadecimal)
- • Reserved characters are encoded
- • Unreserved characters remain unchanged
Key Features
URL Encode
Convert special characters to percent-encoding
URL Decode
Restore encoded URLs to readable format
Syntax Highlighting
Color-coded output for easy reading
100% Private
All processing happens in your browser
Common Use Cases
- Encoding query parameters for API requests
- Converting non-ASCII characters in URLs
- Handling special characters like spaces and ampersands
- Debugging encoded URLs in web development
- Preparing data for form submissions
!Usage Boundaries & Limitations
✅ Appropriate For:
- • Query parameters and form data
- • API requests and web services
- • URL parameters with special characters
- • Multilingual content in URLs
⚠️ Not Suitable For:
- • Complete URL structure encoding
- • Domain names or protocols
- • Already encoded content (double encoding)
- • HTML entity encoding
Real-World Scenarios
1Building API Query Strings
You're building an e-commerce search feature and need to create URL query parameters from user input.
Solution: Use URL encoding to handle spaces, apostrophes, and ampersands properly.
2International Character Support
Your web app needs to handle user searches containing Chinese, Japanese, or other Unicode characters.
Solution: Encode Unicode characters to ensure they're properly transmitted in URLs.
3Social Media Sharing
Creating shareable links for social media posts that include dynamic content.
Solution: Encode parameters to prevent URL breaking and ensure proper social media integration.
How to Use URL Encoding
Enter Your URL or Text
Paste your URL or enter the text that needs encoding/decoding in the input field above.
Choose Encode or Decode
Select 'Encode' to convert special characters, or 'Decode' to convert encoded URLs back to readable format.
Click Convert
Click the convert button to instantly see the encoded or decoded result in the output field.
Copy and Use
Copy the result and use it in your web applications, API calls, or documentation.
Frequently Asked Questions
What is URL encoding?
URL encoding converts characters into a format that can be transmitted over the Internet. Special characters are replaced with a '%' followed by two hexadecimal digits.
When should I use URL encoding?
Use URL encoding when your URL contains special characters like spaces, ampersands (&), or non-ASCII characters like Chinese or Japanese text.
Is my data secure?
Yes, all encoding and decoding happens entirely in your browser. Your data is never sent to any server.
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