DevToolkit

URL Encoder / Decoder

Encode and decode URLs and URL components.

Input

About This Tool

URL encoding converts special characters to a format safe for URLs. This tool provides two methods:

  • encodeURI - Encodes full URLs, preserves special characters like /
  • encodeURIComponent - Encodes all special characters, safe for URL parameters

What is URL Encoding?

URL encoding, also known as percent-encoding, is a mechanism for converting characters that are not allowed in a URL into a format that can be transmitted over the internet. It replaces unsafe ASCII characters with a "%" followed by two hexadecimal digits representing the character's ASCII value.

For example, a space character (ASCII 32) becomes %20, and the plus sign (+) becomes %2B. This ensures that URLs can contain special characters, spaces, and non-ASCII characters without breaking web standards or causing parsing errors.

How to Use This URL Encoder/Decoder

Encoding URLs:

  1. Choose between "Encode URI" or "Encode URI Component" mode
  2. Paste your text or URL containing special characters
  3. Click "Encode" to convert unsafe characters to percent-encoded format
  4. Copy the encoded result for use in URLs, APIs, or web applications

Decoding URLs:

  1. Switch to "Decode" mode
  2. Paste your percent-encoded URL or text
  3. Click "Decode" to convert back to readable text
  4. Get the original text with all special characters restored

Common Use Cases

  • API Development: Encode query parameters and form data before sending HTTP requests
  • Web Development: Safely include user input in URLs without breaking navigation
  • Data Transmission: Ensure special characters in data don't interfere with URL parsing
  • SEO Optimization: Encode URLs for better search engine compatibility
  • Debugging: Decode encoded URLs to understand what data is being transmitted

encodeURI vs encodeURIComponent

JavaScript provides two URL encoding functions with different purposes:

encodeURI

Designed for encoding complete URIs. It preserves characters that have special meaning in URLs like :, /, ;, and ?. Use this when you want to encode an entire URL.

encodeURIComponent

Encodes all characters that could cause parsing problems in URL components. It encodes everything including :, /, ;, and ?. Use this for individual URL components like query parameters.

Frequently Asked Questions

Q: When should I use URL encoding?

Use URL encoding whenever you need to include special characters, spaces, or non-ASCII characters in URLs. This includes query parameters, form data, and any user input that becomes part of a URL.

Q: Is URL encoding the same as Base64?

No, they're different. URL encoding replaces individual characters with %XX sequences, while Base64 converts binary data to a text representation using 64 different characters. URL encoding is specifically for making text URL-safe.

Q: Do I need to decode URLs before using them?

Most modern browsers and HTTP libraries automatically decode URLs. However, if you're processing URL data manually or debugging, you may need to decode them to see the original content.

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