URL Encoder & Decoder
Percent-encode text for safe use in URL query parameters, or decode an encoded URL component back into readable text. All conversion happens locally in your browser.
Local Processing
Your tool input is processed locally in your browser and is not sent to DevToolsLabs servers.
Raw String / URL
Encoded Output
How to use this tool
- Choose Encode or Decode mode.
- Paste the text or URL component into the input field.
- Review the converted value generated by the browser's URI APIs.
- Copy the output into your URL, application, or test request.
Example Usage
hello world@example.com
hello%20world%40example.com
When to use this tool
- Preparing query parameter values for API requests.
- Decoding tracking URLs during debugging.
- Handling spaces, emoji, and reserved characters safely in URLs.
Frequently Asked Questions
What is percent-encoding?
Percent-encoding represents reserved or non-ASCII characters as a percent sign followed by their UTF-8 hexadecimal bytes.
Is the input sent to a server?
No. Encoding and decoding use the browser's native URI functions on your device.
Why can decoding fail?
A malformed percent sequence, such as a percent sign without two hexadecimal digits, is not a valid encoded URL component.
Built by Developers, For Developers
DevToolsLabs is maintained as an open-source collection of focused developer utilities. Most transformations run locally in your browser; tools that require a network service disclose the destination beside the tool. Each utility is built around a concrete development workflow and can be reviewed in the public source repository.