URL Encoder/Decoder
Our URL Encoder/Decoder helps developers safely encode special characters and spaces for use in URLs and query parameters. Essential for building APIs, handling form submissions, and working with international characters in web applications.
How to Use This Calculator
Select "Encode to URL" or "Decode from URL" from the mode dropdown, then paste your text or encoded URL string into the input field. Click encode or decode to process your data instantly. The tool converts special characters, spaces, and non-ASCII characters to percent-encoded format (like %20 for space). Use the copy button to transfer results. Only encode URL components like query parameter values, not entire URLs. The tool properly handles Unicode characters using UTF-8 encoding.
Why URL Encoding Matters
URL encoding is essential for building valid URLs that work across all browsers and systems. Special characters like spaces, ampersands, and equals signs have special meanings in URLs and must be encoded when used as data. Without proper encoding, URLs break, data gets misinterpreted, and web applications fail. URL encoding is fundamental for RESTful APIs, form submissions, query strings, and international characters. While frameworks handle this automatically, developers need to understand encoding for debugging, API development, and creating robust web applications.
Frequently Asked Questions
Should I encode the entire URL or just parts?
Only encode URL components like query parameter values and path segments with special characters. Don't encode the entire URL structure (protocol, domain, separators) as this will break the URL.
How are spaces encoded in URLs?
Spaces are encoded as %20 (the standard) or + in query strings. This tool uses %20, which is the most universally compatible encoding across all browsers and systems.
Can I encode Unicode characters?
Yes. The tool handles Unicode characters by encoding them using UTF-8 first, then applying percent encoding. This ensures international characters work correctly in URLs.
Is my data stored or sent to a server?
No. All encoding and decoding happens in your browser. Your data never leaves your device, ensuring complete privacy and security.