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URL Encoder Decoder

Encode or decode URL strings for safe sharing.

How This Tool Works

The URL Encoder/Decoder converts text to and from percent-encoded URL format. URLs can only contain a limited set of 'safe' ASCII characters. Any other character (spaces, special symbols, non-ASCII letters, Unicode) must be percent-encoded: replaced with a % sign followed by two hexadecimal digits representing the character's byte value. For example, a space becomes %20, # becomes %23, and é becomes %C3%A9. Encoding is required for query string values, path segments with special characters, and data passed through HTTP requests.

How to Use

  1. Paste the URL or text you want to encode/decode in field A.
  2. Click Run. The result shows the encoded form (% signs) or the decoded human-readable form.
  3. For encoding: raw text goes in, URL-safe encoded text comes out.
  4. For decoding: a percent-encoded URL goes in, the original readable text comes out.

Common Questions

What is the difference between encodeURI and encodeURIComponent?

encodeURI encodes a full URL — it leaves : / ? # & = intact because those are structural URL characters. encodeURIComponent encodes a URL component (like a query parameter value) — it encodes everything including & = and ?. Use encodeURIComponent for query string values.

When should I encode a URL?

Always encode user-provided values before appending to a URL. If a user searches for 'hello world & more', the query parameter must be ?q=hello%20world%20%26%20more or the & will break the URL structure.

What is double-encoding and why is it a problem?

Double-encoding happens when you encode an already-encoded string — %20 becomes %2520 (% becomes %25). The server decodes once and gets %20 instead of a space. Always decode before re-encoding.

Read the full guide →