URL Encoder & Decoder
Convert special characters to percent-encoded format for safe URL transmission. Decode encoded URLs back to readable text.
Quick Encode Examples
Hello World! How are you?
→ Hello%20World%21%20How%20are%20you%3F
search?q=SEO tools & tips
→ search%3Fq%3DSEO%20tools%20%26%20tips
https://example.com/path with spaces/page.html
→ https%3A%2F%2Fexample.com%2Fpath%20with%20spaces%2Fpage.html
Quick Decode Examples
Hello%20World%21%20How%20are%20you%3F
→ Hello World! How are you?
search%3Fq%3DSEO%20tools%20%26%20tips
→ search?q=SEO tools & tips
https%3A%2F%2Fexample.com%2Fpath%20with%20spaces%2Fpage.html
→ https://example.com/path with spaces/page.html
What Is URL Encoding?
URL encoding, also known as percent encoding, is a mechanism that converts special characters in a URL into a format that can be safely transmitted over the internet. When a character is not allowed in a URL (like spaces, ampersands, or question marks), it is replaced with a percent sign (%) followed by two hexadecimal digits representing the character's ASCII code.
For example, a space character becomes %20, an exclamation mark becomes %21, and an ampersand becomes %26. This ensures that URLs remain valid and can be parsed correctly by web browsers, servers, and APIs.
URL encoding is essential for web development, API integration, form submissions, and SEO when handling query parameters that contain special characters or non-ASCII text.
Common URL Encoded Characters
Space → %20! → %21" → %22# → %23$ → %24% → %25& → %26' → %27( → %28) → %29+ → %2B/ → %2FWhy URL Encoding Matters for SEO
URL encoding directly impacts search engine optimization in several important ways. When URLs contain unencoded special characters, search engines may misinterpret them, leading to duplicate content issues or broken indexing.
- Duplicate Content Prevention: A URL with spaces encoded as
%20and the same URL with spaces as+could be seen as different pages. - Canonical URL Consistency: Always use consistently encoded URLs in your canonical tags and internal links.
- XML Sitemaps: URLs in sitemaps must be properly encoded to avoid validation errors.
- Tracking Parameters: UTM parameters with special characters must be encoded to pass correctly through redirects.
When to Use URL Encoding
✓ Encode When:
- • Building API request URLs with user input
- • Creating query strings with spaces or symbols
- • Submitting form data via GET method
- • Adding tracking parameters to URLs
- • Handling non-ASCII characters (Chinese, Arabic, etc.)
✗ Don't Double Encode:
- • A percent sign (%) becomes %25 when encoded
- • Double encoding breaks URLs: %20 → %2520
- • Always check if a string is already encoded
- • Use decoding before re-encoding
Common Use Cases
API Development
Encode parameters in REST API calls
SEO Campaigns
Clean tracking URLs with parameters
International URLs
Handle non-ASCII characters safely
Frequently Asked Questions
What is the difference between URL encoding and HTML encoding?
URL encoding (percent encoding) converts characters for safe use in URLs (e.g., space → %20). HTML encoding converts characters for safe display in HTML (e.g., < → <). They serve different purposes and use different escape formats.
Does Google penalize encoded URLs?
No, Google handles encoded URLs correctly. However, inconsistent encoding (using %20 vs + for spaces) can create duplicate content issues if your server treats them as different URLs. Use consistent encoding and canonical tags to prevent this.
Is this tool safe for sensitive data?
Yes! Our URL Encoder/Decoder processes everything directly in your browser. No data is sent to or stored on our servers, making it completely safe for sensitive API keys, authentication tokens, or private URLs.
What characters are not URL-safe?
Spaces, < > # % { } | \ ^ ~ [ ] `, and all non-ASCII characters must be encoded. Structural characters like ? & = / must be encoded when they appear inside values rather than as delimiters.