The URL Encoder & Decoder is an essential tool for web developers and anyone working with web addresses. URLs can only contain a specific set of characters; special characters must be converted into a format known as percent-encoding (e.g., a space becomes `%20`). This tool allows you to encode a string, converting all special characters into their URL-safe equivalents. Conversely, it can decode a URL-encoded string back into its original, human-readable form. This is crucial for correctly passing data in URL query strings or ensuring that any URL is valid and works as expected.

To Encode a String for a URL:

1. Select the "Encode" tab.
2. Type or paste your string with special characters (like spaces, slashes, or ampersands) into the "Decoded String" text area.
3. Click the "Encode" button.
4. The URL-safe, percent-encoded string will appear in the "Encoded String" text area on the right.

To Decode a URL-Encoded String:

1. Select the "Decode" tab.
2. Paste a URL-encoded string (containing `%` characters) into the "Encoded String" text area.
3. Click the "Decode" button.
4. The original, decoded string will appear in the "Decoded String" text area on the right.