Paste or type your URL, header or IP address into the input field.
The output updates as you type. Adjust the options if you need a different format.
Copy the result, or share the URL to hand the exact input to someone else.
About Basic Auth Header
Build and decode HTTP Basic authentication headers. In build mode, a username and password become a Base64 token and a full 'Authorization: Basic …' header; in decode mode, paste a header or token to recover the credentials.
Base64 is encoding, not encryption, so Basic auth must always run over HTTPS.
What people use it for
Create an Authorization: Basic header for an API request or curl call.
Decode a Basic auth header to check the username and password.
Frequently asked questions
Does it work both ways?
Yes. Build a header from credentials, or decode an existing header or token back into username and password.
Is Basic auth secure?
Only over HTTPS. The credentials are merely Base64-encoded, not encrypted.
Is it private?
Every calculation happens on this page, in your own browser. Your input is never sent to a server and never logged, which also means the tool keeps working when you are offline.