URL Encoder/Decoder
Encode and decode URL components, query values and callback parameters while debugging browser and API requests.
Tool Workspace
This tool runs in your browser. Developer Data Tools does not save pasted input to a server, but avoid using production secrets, access tokens, private keys or sensitive business data in any online page.
Ready. Processing runs in your browser.
Core Features
- Encode unsafe URL characters.
- Decode query strings and copied URL parts.
- Highlight differences between spaces and plus signs.
- Support query debugging workflows.
How to Use
- Paste a query value, path segment or full copied fragment.
- Encode before inserting user-controlled values into URLs.
- Decode when inspecting a copied request from DevTools.
- Check whether the value belongs in a path, query string or form body.
Common Errors
- Using encodeURI when encodeURIComponent is needed.
- Treating plus signs and spaces as identical everywhere.
- Double-encoding percent signs.
- Forgetting to encode non-English characters.
Real Developer Use Cases
- Debugging broken query parameters.
- Preparing callback URLs for OAuth tests.
- Checking encoded search values from browser requests.
Technical Explanation
URL encoding protects reserved characters so they can safely travel inside a URL. Developers often run into bugs when values include spaces, ampersands, equals signs, percent characters or non-English text. The right encoding function depends on whether the value is a whole URL, a path segment or an individual query parameter.
FAQ
Is my input uploaded to your server?
Tool input is processed in your browser and is not saved by this site.
Can I use this with production secrets?
Do not paste production passwords, private keys, access tokens or sensitive business data into any online tool unless you fully understand the risk.
Why does this page include explanations below the tool?
Developer Data Tools is designed to help users understand the data problem, not just transform input and output.