Free tool
DeveloperURL Encoder/Decoder
Percent-encode text for query strings or decode encoded URLs. Ideal for REST API debugging and web development labs.
Runs in your browser — your data stays on your device
Free toolSpaces, ampersands, and non-ASCII characters break URLs unless you encode them. This free URL encoder/decoder uses standard percent-encoding so JavaScript developers and programming students can prepare REST API query values or reverse mysterious %20 sequences—without installing software.
How to use the URL Encoder/Decoder
- 1
Choose Encode for plain text or Decode for percent-encoded input.
- 2
Paste the string you need to transform.
- 3
Copy the result into your browser address bar, fetch call, or Postman request.
Why percent-encoding saves hours of API debugging
A forgotten encode step turns hello world into a broken route and leaves beginners blaming the framework. Web developers who understand that %20 is a space fix query bugs in minutes. Practise here before you ship search filters and redirect URLs.
URL encoding example
Encode hello world & API=/v1/users?sort=name and you will see percent sequences for spaces, &, =, /, and ?. Decode that output to recover the original text for comparison.
Guides and next steps
Privacy note
URL encoding and decoding run entirely in your browser. Nothing is uploaded.
Frequently asked questions
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