URL Encoder / Decoder
Encode or decode URLs and query parameters instantly
URL Encode
Encodes special characters in a URL using encodeURIComponent. Use this for query parameter values.
URL Decode
Decodes percent-encoded URL back to its original form.
Full URL Encode (RFC 3986)
Encodes a complete URL preserving the URL structure while encoding only the parts that need encoding.
About URL Encoder / Decoder
Our free online URL encoder and decoder is a powerful tool that helps developers, webmasters, and anyone working with web technologies to properly encode or decode URLs and query parameters. URL encoding, also known as percent-encoding, converts characters that are not allowed in a URL into a format that can be safely transmitted over the internet. Characters like spaces, &, ?, #, and non-ASCII characters are replaced with a % followed by two hexadecimal digits representing the character's ASCII code. This URL encode/decode tool provides three modes: standard encodeURIComponent, decoding, and full encodeURI for complete URLs. All processing happens entirely in your browser — your data is never sent to any server, ensuring complete privacy and security.
How to Use the URL Encoder/Decoder
- Choose your mode: Click on the "Encode", "Decode", or "Full Encode" tab depending on what you need.
- Enter your text: Paste or type the URL or text you want to encode or decode in the input textarea.
- Click the action button: Press "Encode", "Decode", or "Full Encode" to process your input.
- View the result: The encoded or decoded output appears instantly in the result area below.
- Copy or clear: Use the "Copy" button to copy the result to your clipboard, or "Clear" to start over.
Tip: Use Encode for query parameter values, Full Encode for complete URLs, and Decode to reverse percent-encoded strings.
Frequently Asked Questions
URL encoding, also called percent-encoding, is a mechanism for encoding information in a Uniform Resource Identifier (URI) under certain circumstances. It replaces unsafe ASCII characters with a '%' followed by two hexadecimal digits representing the character's ASCII code.
encodeURI encodes a complete URI but preserves characters that are part of URI syntax (like :, /, ?, #). encodeURIComponent encodes everything including those characters, making it suitable for encoding query parameter values. Use encodeURIComponent when you need to encode data that will be part of a query string.
Spaces are not allowed in URLs. In query strings, spaces are sometimes encoded as + (application/x-www-form-urlencoded), but in standard URL encoding they are encoded as %20, which is the ASCII hex value for the space character.
Characters that must be encoded include: spaces, &, ?, #, %, +, /, =, :, ;, @, $, ,, !, ~, ', (, ), *, and all non-ASCII characters. Any character that is not an unreserved character (A-Z, a-z, 0-9, -, _, ., ~) should be encoded.
No. URL encoding (percent-encoding) is used for URLs and uses %XX format. HTML encoding uses &entity; format (like & for &). They serve different purposes and are not interchangeable.
Yes, use the "Full Encode" mode which uses encodeURI. This encodes the URL while preserving structural characters like ://, ?, and # that are part of the URL syntax.
No. All URL encoding and decoding is performed entirely in your browser using JavaScript. Your data is never transmitted to or stored on any server.
Double encoding happens when an already encoded URL is encoded again. For example, %20 becomes %2520. This can cause issues in web applications and should be avoided unless specifically required.
Non-ASCII characters are automatically encoded by the tool. For example, the Unicode character € (euro sign) is encoded as %E2%82%AC in UTF-8 representation.
There is no practical limit for this tool. However, very large inputs may affect browser performance since all processing happens client-side.
The Complete Guide to URL Encoding and Decoding
What Is URL Encoding and Why Is It Important?
URL encoding is a fundamental concept in web development that ensures data can be safely transmitted via URLs. When you submit a web form, click a link with parameters, or make an API request, the data in the URL must be properly encoded to avoid misinterpretation by web servers. Characters like spaces, ampersands (&), question marks (?), and hash symbols (#) have special meanings in URLs and must be encoded to be used as literal data. Without proper URL encoding, web applications can break, data can be lost, and security vulnerabilities like URL injection attacks can occur.
How URL Encoding Works Behind the Scenes
URL encoding works by replacing unsafe characters with a percent sign (%) followed by two hexadecimal digits that represent the character's numeric value in the ASCII or UTF-8 character set. For example, the space character (ASCII 32) becomes %20, and the ampersand (ASCII 38) becomes %26. Modern web standards use UTF-8 encoding for non-ASCII characters, so a character like ñ (Latin small letter N with tilde) becomes %C3%B1. Understanding how percent-encoding works is essential for developers working with REST APIs, web services, and any application that handles URL data.
Key Features of Our URL Encoder/Decoder Tool
- Three encoding modes: Standard encodeURIComponent, decodeURIComponent, and full encodeURI for complete URLs
- Instant results: Real-time encoding and decoding as you type
- Character statistics: View original and encoded length for each operation
- Copy to clipboard: One-click copy of encoded or decoded results
- 100% client-side: All processing happens in your browser — zero server interaction
- Dark mode support: Easy on the eyes with automatic dark theme
- Free and unlimited: No registration, no usage limits, completely free
Common Use Cases for URL Encoding
- Web developers encoding query parameters in JavaScript fetch and AJAX calls
- API integrators preparing data for REST API endpoints
- SEO professionals debugging URL structures and redirect chains
- Security researchers testing for URL injection and XSS vulnerabilities
- Content creators encoding special characters in sharing URLs
- E-commerce platforms encoding product names and search parameters
Best Practices for URL Encoding
- Always encode user-generated input before including it in URLs to prevent injection attacks
- Use encodeURIComponent for query parameter values, not encodeURI
- Be consistent with encoding — decode before reading and encode before sending
- Avoid double encoding by tracking whether data has already been encoded
- Use UTF-8 encoding for proper handling of international characters and Unicode
- Test encoded URLs by decoding them to verify correctness
Why Choose Our Free Online URL Encoder/Decoder?
Our tool stands out because it combines three essential URL encoding functions in one clean interface. Unlike other online tools, we provide both encodeURIComponent and encodeURI modes, giving you the flexibility to handle different URL encoding scenarios. The tool is completely free, runs entirely in your browser for maximum privacy, and features a modern dark mode for comfortable use. Whether you're a professional developer debugging API calls or a beginner learning web technologies, our URL encoder and decoder provides the reliability and ease of use you need.
Start Encoding Your URLs Today
Don't let improperly encoded URLs break your web applications. Use our free online URL encoder/decoder to ensure your URLs are always formatted correctly. No signup, no installation, no data uploads — just fast, accurate URL encoding and decoding right in your browser. Bookmark this page for quick access whenever you need to work with URLs.