URL Encode / Decode

Overview

• Converts text into URL-encoded (percent-encoded) format, or converts a URL-encoded string back into the original text.
• URL query parameters cannot directly contain Japanese text or symbols such as &, =, or spaces, so this converts them into %XX format so they can be safely embedded.
• This behaves the same as encodeURIComponent/decodeURIComponent, so it is intended for encoding a single value, such as a query parameter value, rather than an entire URL.

Usage

1. Enter the text you want to encode, or the URL-encoded string you want to decode, into the text area.
2. Click the "Encode" or "Decode" button.
3. The result is displayed below.

Example

こんにちは World!

%E3%81%93%E3%82%93%E3%81%AB%E3%81%A1%E3%81%AF%20World!

Use Cases

• Encoding just the value portion beforehand when building a URL whose query parameters contain Japanese text or symbols
• Decoding a URL-encoded value received from another system to check the original string
• Converting special characters (such as & or =) found in a web form or link into a form that can be safely handled as a URL

FAQ

Notes

• A space is converted to %20, not a +, following encodeURIComponent's behavior.
• If you pass an entire query string as-is (in the form key=value&key2=value2), the & and = characters will also be encoded. Convert one value at a time instead.
• When decoding, entering a string that is invalid as URL encoding (for example, a % not followed by two valid hex digits) results in an error.