Basic Auth Header Generator
Make an HTTP Basic Authorization header from a username and password, or decode one back. Get curl and fetch examples. Runs in your browser.
More options
Shortcuts: Ctrl+Enter run · Ctrl+Shift+C copy result · / search (use ⌘ on Mac)
Free Basic Auth Header Generator
Type a username and password and get the Authorization header that an API or web server expects, plus a curl and a fetch example. You can also paste a header to read the username and password inside it. It gives developers a quick browser-based way to solve a focused basic auth header generator task before moving the result into a project.
How to use Basic Auth Header Generator
Choose "Make a header", enter the username and password and copy the header. Choose "Read a header" to turn Authorization: Basic … back into the username and password.
Common mistakes
- Putting a colon in the username: Basic authentication cannot represent it.
- Pasting only part of the header: paste the whole Authorization line or just the Base64 text after "Basic".
Frequently asked questions
What is Basic authentication?
The username and password are joined with a colon, turned into Base64 and sent in the Authorization header after the word Basic. Many APIs, routers and web servers use it.
Is Base64 a safe way to hide a password?
No. Base64 is only a way of writing text and anyone can reverse it. Use Basic authentication only over HTTPS, and prefer tokens where you can.
Can a username contain a colon?
No. The first colon separates the username from the password, so a username with a colon cannot be read back. The password may contain colons.
Is my password uploaded?
No. The header is made in your browser and nothing you type is sent to a server.
How do I use this basic auth header generator tool?
Use the interactive controls above; processing stays in your browser and the result is intended as a practical starting point for development work.
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