About this URL Encoder & Decoder
URL Encoder & Decoder helps when text contains spaces, punctuation or non-ASCII characters that need to travel safely inside a URL component.
Formula or method
Encoding uses percent-encoding for a URL component; decoding converts valid percent sequences back to text.
Example
“hello world?” encodes to “hello%20world%3F”.
Common uses
- Encode query-string values.
- Decode copied percent-encoded text.
- Check how special characters are represented in URLs.
How to use this tool
- Enter the values or text requested by the calculator.
- Choose units or options when the tool provides them.
- Select the calculation button and review the result.
- Use the formula, example and notes on this page to check whether the result fits your situation.
Important note
Use this for URL components such as query values, not as a full URL validator.
Frequently asked questions
Does this encode an entire URL?
It uses component-style encoding. Full URLs may contain reserved characters that should remain structural.
What happens with invalid encoded text?
The tool reports an error instead of guessing.