How is a Basic auth header built?

The "username:password" string is Base64-encoded and used as Authorization: Basic .

What is a Bearer token?

It's a way of passing an access token issued by OAuth2, JWT, etc. directly as Authorization: Bearer .

Is the credential information I enter sent to a server?

No. All processing, including Base64 encoding, happens entirely in your browser.

🔑 HTTP Authentication Header Generator

Instantly generate a Basic or Bearer Authorization header value.

Basic (username/password) Bearer (token)

Username

Password

The result will appear here

How to use

Choose Basic or Bearer.
Enter a username/password or a token.
Copy the generated Authorization header value.

🎯 Use Cases

Quickly generate an auth header for Postman or curl testing
Prepare example header values for API documentation
Check the URL and header value for a Basic-auth-protected server

Example

Input

Mode: Basic
Username: admin
Password: s3cr3t

Output

Authorization: Basic YWRtaW46czNjcjN0

In Basic mode the "username:password" string (admin:s3cr3t) is Base64-encoded. The result, YWRtaW46czNjcjN0, is used directly as the Authorization header value.

FAQ

How is a Basic auth header built?: The "username:password" string is Base64-encoded and used as Authorization: Basic <value>.
What is a Bearer token?: It's a way of passing an access token issued by OAuth2, JWT, etc. directly as Authorization: Bearer <token>.
Is the credential information I enter sent to a server?: No. All processing, including Base64 encoding, happens entirely in your browser.