Free URL Encoder / Decoder – Encode & Decode URLs Instantly

Special characters like spaces, ampersands, and question marks break URLs when they're passed raw through query parameters, API requests, or form submissions, which is exactly why proper URL encoding exists. Our URL Encoder / Decoder handles this conversion instantly, transforming any text or URL into a safely encoded string, or decoding an already-encoded URL back into readable text, all processed directly inside your browser. Since this URL Encoder / Decoder runs entirely locally, your URLs and query parameters are never transmitted to an external server.

Using the URL Encoder / Decoder starts with selecting your direction using the two mode tabs: Encode URL or Decode URL. Type or paste your content into the input field, and the conversion happens instantly in the live output panel, no need to click a separate convert button or wait for processing. This immediate feedback makes it easy to test how different characters or strings will be encoded before actually using them in your application.

What sets this URL Encoder / Decoder apart is the inclusion of a Strict Encoding toggle that follows the RFC 3986 specification precisely. Standard JavaScript URL encoding leaves certain characters like exclamation marks, apostrophes, parentheses, and asterisks untouched, since they're technically valid in some URL contexts. However, some strict APIs and systems require these characters to be percent-encoded as well. Toggling on Strict Encoding ensures every one of these edge-case characters gets properly converted, giving you full RFC 3986 compliance when standard encoding isn't strict enough.

Switching between encode and decode modes intelligently carries your current output into the input field, letting you quickly verify that an encoded string decodes back to exactly what you started with, a useful sanity check when debugging URL-related issues. If you attempt to decode a malformed or invalid percent-encoded sequence, this URL Encoder / Decoder clearly flags the error rather than silently producing broken or partial output, helping you immediately identify when something isn't valid URL encoding.

Once you have your result, a single click copies it directly to your clipboard, ready to paste into your code, browser address bar, or API testing tool. Because this URL Encoder / Decoder runs entirely through native browser JavaScript, there's no signup, no file size limits, and instant results regardless of input length. It's a genuinely practical utility for web developers, API testers, and anyone who regularly works with query strings and URL parameters, completely free.