URL Encoder/Decoder — Percent-Encoding Made Easy

How Does A URL Encoder/Decoder Work?

URL encoding, also called percent-encoding, converts characters that aren't allowed in a URL (spaces, symbols, non-ASCII letters) into a safe %XX format, where XX is the character's hexadecimal byte value. This tool uses your browser's native JavaScript engine to encode and decode instantly, with zero server upload and complete UTF-8 support for any language or emoji.

This free URL encoder and decoder supports both Component encoding (encodeURIComponent) and Full URL encoding (encodeURI), plus automatic query parameter parsing to break a complex URL into readable key-value pairs.

encodeURIComponent vs encodeURI: Which Should You Use?

Use Component mode (encodeURIComponent) when encoding a single value that will be placed inside a URL, such as a query parameter, form field, or path segment — it encodes every special character including & = ? # /, which is essential because those characters would otherwise be misread as part of the URL structure. Use Full URL mode (encodeURI) when you already have a complete, valid URL and just need to escape spaces or non-ASCII characters, since it deliberately leaves structural characters like : / ? & = # @ untouched so the URL keeps working correctly [web:123][web:125].

The Most Common URL Encoding Mistake

The single biggest mistake developers make is using encodeURI on a query parameter value, which fails to escape & and = — this can let a value like "name=John&age=30" break your query string into extra unintended parameters. The opposite mistake, using encodeURIComponent on a full URL, over-encodes the protocol and path separators, turning "https://" into a broken, unreadable string [web:124][web:131].

Reading Query Parameters Automatically

When you paste a URL containing a query string (anything after a ?), this tool automatically detects and parses each key-value pair, displaying them in a clean, readable list. This makes it easy to inspect complex URLs, debug API requests, or understand exactly what data a tracking or redirect link is passing along.

Common Uses For A URL Encoder/Decoder

This free tool is commonly used to safely encode search queries, form values, and API parameters before appending them to a URL, decode tracking links and UTM parameters to see their original text, debug malformed URLs returned by third-party APIs, prepare filenames or paths containing spaces or special characters for web use, and encode data for redirect URLs and OAuth callback parameters.

URL Encoder Keywords And Related Searches Worldwide

People discover this tool by searching url encode, url decode, url encoder decoder, percent encoding, encodeURIComponent online, encodeURI vs encodeURIComponent, decode url string, encode special characters url, query string parser, and url escape characters. This tool is used by developers, QA testers, and digital marketers across the United States, United Kingdom, Canada, Australia, India, and worldwide.

Frequently Asked Questions