MetoolzyURL Encoder / Decoder
Encode & Decode
encodeURIComponent and encodeURI modes.
Real-time
Results update as you type.
Copy Result
One-click copy to clipboard.
Client-side
All processing in your browser. No data uploaded.
Giới thiệu về URL Encoder / Decoder
URL encoding, also called percent-encoding, converts characters that are not allowed or have special meaning in URLs into a safe format. Each unsafe character is replaced by a percent sign followed by its two-digit hexadecimal code point — for example, a space becomes %20 and an ampersand becomes %26. This tool supports two standard JavaScript functions: encodeURIComponent encodes everything except letters, digits, and the characters - _ . ! ~ * ' ( ), making it ideal for encoding individual query parameter values. encodeURI encodes a full URL and preserves characters like : / ? # & = that have structural meaning in a URL. Proper URL encoding is essential for building web applications, constructing API request URLs, handling form submissions, and ensuring links work correctly across browsers and operating systems. Decoding lets you inspect encoded URLs and query strings in a human-readable form. This tool processes everything client-side so your data stays private.
Làm sao để URL Encoder / Decoder?
- Choose "Encode" to percent-encode text or "Decode" to convert encoded strings back to plain text.
- Select the encoding scope: use "encodeURIComponent" for a single value (e.g., a query param), or "encodeURI" for a full URL.
- Type or paste your text into the input field.
- The encoded or decoded result appears instantly in the output field.
- Click "Copy" to copy the result to your clipboard.
Câu hỏi thường gặp
What is the difference between encodeURIComponent and encodeURI?
encodeURIComponent encodes almost everything except basic alphanumeric characters, making it suitable for encoding individual query parameter values. encodeURI preserves characters that are structurally part of a URL (like /, ?, #, &) so it is meant for encoding complete URLs.
Why does a space become %20 and not +?
%20 is the standard percent-encoding for a space. The + notation for spaces is specific to the application/x-www-form-urlencoded format used in HTML form submissions, not in general URLs.
When would I need to URL-encode a string?
Whenever you embed a value inside a URL — such as a search query, a file path, or a user-provided parameter — you should URL-encode it to prevent special characters from breaking the URL structure or being misinterpreted by the server.
Can I URL-decode multiple parameters at once?
Yes — paste the full query string (e.g., name=John%20Doe&city=S%C3%A3o+Paulo) and switch to Decode with encodeURIComponent mode to see the decoded result. Each parameter will be decoded inline.
Is this tool safe for sensitive data?
All processing happens in your browser with no server communication, so your data remains private. That said, URL encoding is not encryption — encoded values can be decoded by anyone who sees them.
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