URL Decoder

What Is a URL Decoder?

A URL Decoder is a free online tool that converts percent-encoded (URL-encoded) text back to its original readable format. When URLs contain special characters, they are encoded using percent-encoding where each character is replaced by a percent sign followed by two hexadecimal digits. The URL Decoder reverses this process, making encoded URLs and query strings human-readable.

URL decoding is an essential tool for web developers, API testers, SEO analysts, and anyone who works with URLs, query strings, or HTTP request data.

Why URL Decoding Is Needed

When working with web technologies, you frequently encounter percent-encoded URLs that look cryptic and difficult to read. URL decoding transforms these encoded strings back to their original form so you can:

• Read and understand query string parameters
• Debug HTTP requests and API calls
• Analyze URL structures from web server logs
• Extract information from encoded data
• Verify that URL encoding was applied correctly

Understanding Percent-Encoded URLs

URL encoding replaces unsafe characters with their hexadecimal ASCII equivalents. For example:

• %20 decodes to a space character
• %40 decodes to the @ symbol
• %2F decodes to a forward slash /
• %26 decodes to an ampersand &
• %3D decodes to an equals sign =
• %3F decodes to a question mark ?

Our decoder recognizes all standard percent-encoded sequences and converts them back to their original characters.

How to Use the URL Decoder

1. Paste the percent-encoded URL or text into the input field.
2. The tool automatically decodes all percent-encoded sequences.
3. Copy the decoded, human-readable output.

Common Use Cases for URL Decoding

• API Development and Testing: Decode API request and response URLs to verify parameters and data are correctly formatted.
• Web Server Log Analysis: Server logs often contain URL-encoded paths and query strings. Decoding them makes log analysis much easier.
• SEO Analysis: Decode URLs from analytics tools, sitemaps, and search engine reports to understand URL structures.
• Form Data Analysis: Decode form submission data that has been encoded for transmission.
• Browser URL Investigation: Decode complex browser URLs to understand the underlying parameters and values.
• Security Testing: Security professionals decode URLs to analyze potential injection attacks or suspicious encoded content.

URL Decoding in Programming

Developers often need to decode URLs programmatically. Common functions include:

• JavaScript: decodeURIComponent() and decodeURI()
• Python: urllib.parse.unquote()
• PHP: urldecode() and rawurldecode()
• Java: URLDecoder.decode()
• C#/.NET: Uri.UnescapeDataString()

URL Encoding Standards

URL encoding follows the RFC 3986 standard which defines which characters are safe (unreserved) in URLs and which must be encoded. The unreserved characters that do not need encoding are: A-Z, a-z, 0-9, hyphen, underscore, period, and tilde.

Frequently Asked Questions

What does %20 mean in a URL?

%20 is the URL-encoded representation of a space character.

Is there a difference between URL decoding and HTML entity decoding?

Yes. URL decoding converts percent-encoded sequences back to characters. HTML entity decoding converts HTML entities like & back to & symbols. They are different processes for different contexts.

Is this tool free?

Yes. The URL Decoder is completely free with no registration required.