URL Encoder/Decoder

What is URL Encoding (Percent-Encoding)?

URL encoding, also known as percent-encoding, is a mechanism defined in RFC 3986 for translating characters that are unsafe or reserved in a Uniform Resource Identifier (URI) into a format that can be safely transmitted over the Internet. Each unsafe character is replaced by a percent sign (%) followed by two hexadecimal digits representing its byte value in UTF-8.

For example, a space becomes %20, a question mark becomes %3F, and the ampersand becomes %26. This ensures URLs remain valid across browsers, servers, proxies, and API gateways.

Why Use a URL Encoder/Decoder?

URLs have a strict syntax and only a small set of characters is allowed without escaping. Whenever you embed user input, file names, search terms, or arbitrary data into a URL, you must encode it - otherwise reserved characters like ?, &, #, / and spaces will break routing, query string parsing, or redirects.

A URL decoder reverses this process, turning %20 back into a space and %C3%A9 back into é, so you can inspect payloads from server logs, analytics URLs, or deep links in a human-readable form.

How to Encode or Decode URLs Online (Step-by-Step)

Using the tool is straightforward and takes just a few seconds:

1. Paste your URL or plain text into the Input URL field, or click Sample to load an example.
2. Choose the mode - Decode URL to unescape percent-encoded sequences, or Encode URL to escape special characters.
3. The result appears instantly in the output field. Click Copy to place it on your clipboard.

The tool also parses the URL and shows a breakdown of its components (protocol, host, path, query parameters, fragment) so you can verify the structure at a glance.

Why Choose Our URL Encoder

Our URL encoder is designed for developers who need a fast, accurate, and private way to handle percent-encoding. It uses the browser's native encodeURIComponent and decodeURIComponent implementations, so the result matches exactly what your JavaScript code would produce in production.

There are no ads, no sign-up, no file uploads and no throttling - just instant results with a built-in URL component inspector, sample data, and one-click copy.

How URL Encoding Works (Reserved vs Unreserved Characters)

RFC 3986 splits URI characters into two groups. Unreserved characters (A-Z, a-z, 0-9, -, ., _, ~) are always safe and never encoded. Reserved characters (:/?#[]@!$&'()*+,;=) have special meaning in URLs and must be percent-encoded when used as data rather than as delimiters.

For non-ASCII characters, the value is first encoded as UTF-8, then each byte is represented as %XX. That is why the character é becomes %C3%A9 - two bytes in UTF-8, each written as a percent-escaped hex pair.

Features

Everything you need in a single page, optimized for real-world URL work:

• Encode URL - escape reserved and non-ASCII characters using encodeURIComponent.
• Decode URL - unescape percent-encoded sequences, including multi-byte UTF-8.
• URL component inspector - see protocol, host, port, path, query parameters and fragment at a glance.
• Copy to clipboard for the full result or for any individual URL component.
• Sample data to quickly try encoding or decoding without typing.
• Paste from clipboard and automatic live processing on every keystroke.

Common Use Cases

URL encoding is a daily task for web, backend, and mobile developers. Typical scenarios include:

• Query strings - safely appending user search terms or filter values to URLs.
• REST APIs - sending path and query parameters that include spaces, slashes, or Unicode.
• OAuth redirects - encoding redirect_uri and state parameters per RFC 6749.
• Analytics / UTM parameters - building campaign URLs with readable but safely escaped values.
• Deep links and app links - encoding payloads passed to mobile apps or single-page applications.
• Debugging server logs - decoding captured URLs to understand what a client actually sent.

Is It Safe to Encode URLs Online?

Yes. This URL encoder is fully client-side - all encoding and decoding happens in your browser via standard JavaScript APIs. Your URLs, tokens, and query strings are never uploaded to any server and are not logged, stored, or shared.

You can safely use it on sensitive data such as OAuth tokens, signed links, or staging URLs - closing the tab is enough to remove every trace from this session.

Why Choose DevTools

DevTools is a curated suite of free, privacy-respecting developer utilities. Every tool runs locally in your browser, loads quickly, and is built with the same standards you would use in production - no guesswork, no tracking, no paywall.

Together the tools cover the full developer workflow: data conversion, encoding, formatting, diffing and inspection, so you can stop stitching together random single-purpose websites.

Download & Copy Options

Once you have the encoded or decoded result you can copy it to the clipboard with a single click, or copy any individual parsed component (host, path, query) from the URL components table. This makes it easy to move values into other tools or into your own code.

Need to go further? Combine this page with other DevTools utilities: URL to QR Code, Base64 Encoder / Decoder, and Hex Converter - building a smooth workflow from raw text to safely transmitted payloads.

FAQ

URL Encoding Learning Resources

To deepen your understanding of URL encoding, URI syntax and percent-encoding, explore these authoritative references:

• RFC 3986 - URI Generic Syntax - the canonical specification defining URI structure and percent-encoding rules.
• WHATWG URL Living Standard - the modern specification that browsers actually implement for URL parsing and encoding.
• MDN: encodeURIComponent - reference for JavaScript's component-level URL encoder, including which characters are escaped.
• MDN: URL constructor - guide to parsing and composing URLs programmatically using the standard URL API.