URL Encoder/Decoder

How to Use

1. Choose the mode: click Encode to convert a URL or text to percent-encoding, or Decode to convert an encoded URL back to its original form.
2. If you need maximum encoding (for example, to encode every character except the RFC 3986 unreserved set), toggle the Encode all characters switch. This is useful when you need to safely transmit arbitrary text as a URL parameter value.
3. Type or paste your URL or text into the input field. The tool processes your input automatically with a 200ms debounce — no need to click a button.
4. View the result in the output field. The output is read-only and can be copied or downloaded.
5. Use the Copy button to copy the output to your clipboard, or Download to save it as a text file.
6. Click Swap to move the output into the input field and switch modes — perfect for round-trip verification.
7. Click Load Example to try the tool with sample data, including URLs with spaces, special characters, and Unicode query parameters.
8. Click Clear to reset both input and output fields.

Features

• Dual mode — switch between Encode and Decode with a single click
• Smart URL preservation — by default, preserves URL structural characters (://?&=#.+@/-_~!'()*) so full URLs remain readable
• Encode all characters mode — toggle to percent-encode everything except the RFC 3986 unreserved set (A–Z a–z 0–9 - _ . ~) for maximum safety
• Full Unicode support — correctly encodes and decodes emoji, CJK characters, accented letters, and all UTF-8 text
• Auto-processing — output updates automatically as you type (200ms debounce)
• Error handling — clear error messages for malformed percent-encoded sequences
• Copy to clipboard — one-click copy of the output
• Download output — save the result as a text file
• Swap input/output — instantly swap the result into the input and switch modes
• Load example — try the tool instantly with built-in sample data
• 100% client-side — your data never leaves your browser; no server processing
• Dark mode support — seamless experience in both light and dark themes

Common Use Cases

• Encoding query parameters— when building URLs with user-supplied search terms, filter values, or localized content, encode the parameter values to ensure spaces, ampersands, and special characters don't break the URL structure.
• Decoding encoded URLs — reverse percent-encoding to inspect or debug URLs from server logs, analytics tools, or API responses. Quickly verify that encoded values match expected content.
• Internationalized URLs — encode non-ASCII characters like Chinese, Japanese, Korean, Arabic, or accented Latin characters for safe transmission in URL parameters. For example, café becomes caf%C3%A9.
• Emoji in URLs — encode emoji characters that appear in user-generated content, social media links, or messaging app deep links. Each emoji is encoded as its full UTF-8 byte sequence.
• API development — when constructing API endpoints with path or query parameters, encode values to prevent injection attacks and ensure correct parsing on the server side.
• OAuth and redirect URLs— encode redirect URI parameters in OAuth flows, where the redirect URL itself is passed as a query parameter and must be encoded to avoid confusion with the outer URL's structure.
• Debugging encoded URLs — paste an encoded URL from a browser, server log, or HTTP response to decode and read the original values, helping you identify encoding issues or unexpected characters.