URL Encoder

URL encoding (also known as percent encoding) converts special characters into a format that can be safely transmitted over the internet. Our URL encoder handles this conversion automatically, replacing unsafe characters with their percent-encoded equivalents. This is essential for web development, API calls, and ensuring URLs work correctly across different systems.

Why URLs Need Encoding

URLs can only contain a limited set of characters safely. Characters like spaces, quotes, brackets, and non-ASCII characters have special meanings or aren't allowed in URLs. URL encoding replaces these characters with a percent sign (%) followed by two hexadecimal digits. For example, a space becomes "%20" and an ampersand becomes "%26".

Common URL Encoding Examples

• Space: " " → "%20"
• Exclamation mark: "!" → "%21"
• Quotation mark: """ → "%22"
• Hash: "#" → "%23"
• Dollar sign: "$" → "%24"
• Ampersand: "&" → "%26"
• Plus sign: "+" → "%2B"
• Equals sign: "=" → "%3D"
• Question mark: "?" → "%3F"
• Slash: "/" → "%2F"

When to Use URL Encoding

• Query Parameters: When passing data in URL query strings (?name=value)
• Form Data: When submitting forms with GET method
• API Requests: When constructing URLs for REST API calls
• User Input: When including user-generated content in URLs
• Special Characters: When URLs contain spaces, symbols, or non-ASCII characters
• Email Links: When creating mailto: links with parameters

How to Use This Tool

1. Enter your URL or text in the input field
2. The encoded version appears automatically in the output field
3. Click "Copy Output" to copy the encoded result
4. Use the encoded string in your application, API call, or HTML

URL Encoding vs HTML Encoding

URL encoding is for making URLs safe for transmission in HTTP requests. HTML encoding is for making content safe to display in HTML pages. They serve different purposes: URL encoding ensures URLs work correctly, while HTML encoding prevents XSS attacks and display issues. Always use the appropriate encoding for your context.

Frequently Asked Questions

What's the difference between URL encoding and base64 encoding?

URL encoding replaces specific characters with percent-encoded equivalents, preserving the original structure. Base64 encoding converts entire data into a different character set, completely changing the format. Use URL encoding for URLs and query parameters, and base64 for embedding binary data in text formats.

Do I need to encode entire URLs or just parameters?

Generally, encode only the parameter values, not the entire URL structure. The domain, path, and most URL structure characters should remain unencoded. Encode only the data you're passing as parameter values, especially if they contain spaces or special characters.

Why do some URLs use + for spaces instead of %20?

In query strings, spaces can be encoded as either "%20" or "+". Both are valid, but "%20" is the standard URL encoding. The "+" form is a legacy from application/x-www-form-urlencoded encoding. Our encoder uses the standard "%20" format for consistency.

Can I use this for encoding email addresses in mailto links?

Yes, URL encoding is commonly used in mailto: links for subjects, body text, and other parameters. For example: mailto:user@example.com?subject=Hello%20World. This ensures special characters in email content don't break the mailto link functionality.