Free URL Encoder & Decoder
Encode and decode URLs instantly with our online tool. Perfect for web developers, API testing, and handling special characters in URLs safely and efficiently.
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URL Encoding & Decoding Tool
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Quick Examples
🔍 Search URL with Spaces
https://example.com/search?q=hello world&category=news
Click to try encoding this URL
🔧 API URL (Encoded)
https://example.com/api/users?filter=name%3DJohn%26age%3E25
Click to try decoding this URL
💬 Text with Special Characters
Hello World! How are you? 100% great!
Text with spaces, punctuation, and symbols
Understanding URL Encoding
URL encoding (also called percent encoding) is a method to encode special characters in URLs so they can be safely transmitted over the internet. Certain characters have special meanings in URLs and must be encoded to avoid conflicts.
Why URL Encoding is Necessary
🌐 Web Standards
URLs can only contain ASCII characters (0-127)
🔒 Data Integrity
Prevents special characters from breaking URL structure
🌍 International Support
Enables URLs to contain non-English characters
🔧 API Compatibility
Ensures proper data transmission in web APIs
Common Characters That Need Encoding
| Character | Encoded | Description |
|---|---|---|
| (space) | %20 | Space character |
| ! | %21 | Exclamation mark |
| # | %23 | Hash/Fragment identifier |
| % | %25 | Percent sign |
| & | %26 | Ampersand (parameter separator) |
| + | %2B | Plus sign |
Common Use Cases
🔌 API Parameter Encoding
Encode query parameters for REST API calls, GraphQL queries, and web service requests. Essential for passing complex data through URLs.
📋 Form Data Submission
Prepare form data for URL submission, ensuring user input with spaces and special characters is properly formatted for GET requests.
🔗 URL Construction
Build safe URLs for web scraping, link generation, and navigation. Handle dynamic content with special characters safely.
✉️ Email & Link Handling
Encode email addresses in mailto links and handle special characters in redirect URLs, social media links, and tracking parameters.
How to Use This Tool
- Paste your URL or text into the input field above
- Click "🔒 Encode URL" to convert special characters to percent-encoded format (%20, %21, etc.)
- Click "🔓 Decode URL" to convert percent-encoded characters back to their original form
- Copy the result with the "📋 Copy" button
- Use "🗑️ Clear All" to reset and start over
URL Encoding Best Practices
- Always encode user input before including it in URLs to prevent security issues and broken links
- Use UTF-8 encoding for international character support and proper handling of non-ASCII characters
- Encode query parameters only - don't encode the entire URL structure (protocol, domain, path separators)
- Decode on the server side before processing URL data in your applications
- Test your encoded URLs to ensure they work correctly in browsers and API clients
- Avoid double-encoding - don't encode already-encoded text (e.g., %20 becomes %2520)
- Use consistent encoding across your application - don't mix encoded and unencoded parameters
- Consider URL length limits - browsers support URLs up to 2,000 characters, servers may have lower limits
Frequently Asked Questions
What is the difference between URL encoding and HTML encoding?
URL encoding (percent encoding) converts characters to %XX format for safe transmission in URLs. HTML encoding uses entities like < and > to display special characters in HTML content without rendering. They serve different purposes: URL encoding for web addresses, HTML encoding for page content.
When should I encode vs decode URLs?
Encode URLs when constructing them for API calls, form submissions, or web links - especially when including user input or special characters. Decode URLs when receiving and processing them on your server to extract the original data. Never encode already-encoded URLs (double-encoding).
Is this tool secure for sensitive data?
Yes, all encoding/decoding happens locally in your browser - no data is sent to our servers. The entire process is client-side JavaScript. However, avoid putting sensitive data (passwords, tokens, personal info) in URLs as they may be logged by servers, browsers, or proxy services.
Can I encode entire URLs or just parts?
You can encode both, but typically you should only encode query parameters and values, not the entire URL structure. The protocol (https://), domain name, and path separators (/) should remain unencoded. Only encode the data within query parameters (?key=value), fragments (#), or user-provided content.
What's the difference between + and %20 for spaces?
Both represent spaces in URLs, but in different contexts: %20 is the standard percent-encoding for spaces (used in URL path and query strings). + is application/x-www-form-urlencoded format (commonly used in query strings from form submissions). Modern APIs generally prefer %20, but many accept both. Our tool uses %20 as it's universally compatible.
Why do I need to encode URLs? Can't I just use special characters directly?
URLs have a strict syntax where certain characters have special meanings: ? starts query parameters, & separates parameters, # marks fragments, / separates path segments. Using these characters unencoded breaks URL structure. Additionally, URLs can only contain ASCII characters (0-127). International characters, emojis, and symbols must be encoded to work reliably across all browsers, servers, and APIs.