Base64 for Auth Headers
Build and read Basic auth headers by encoding and decoding Base64, instantly in your browser. No signup.
Open the Free Tool →HTTP Basic authentication encodes credentials as Base64 inside the Authorization header. This tool lets you encode the value you need or decode an existing header to check it, all in one place.
Everything runs in your browser, so your input stays local. It is free with no signup, handy when configuring or troubleshooting Basic auth.
Why use it
Build headers
Type a username and password in the Basic Auth header tab and get the full Authorization: Basic line.
Inspect headers
Paste a whole Authorization: Basic header into Decode; the prefix is stripped for you.
Runs locally
Your input is processed in your browser, not on a server.
Free, no signup
Use it instantly without an account.
FAQ
How does Base64 relate to auth headers?
HTTP Basic auth encodes credentials as Base64 inside the Authorization header.
Can I decode an existing auth header?
Yes. Paste the whole header, including Authorization: Basic, and the tool strips the prefix and shows username:password.
Is my input sent anywhere?
No, encoding and decoding happen locally in your browser.
Is Base64 secure for credentials?
Base64 is encoding, not encryption, so Basic auth should always be used over HTTPS.
Do I need to sign up?
No, it is free with no signup required.
Looking for the full tool? Open Base64 Encoder / Decoder — free and no account needed.
The All Innovativ Base64 for Auth Headers tool builds and reads HTTP Basic auth Authorization headers by encoding and decoding Base64 entirely in your browser — free, 100% browser-based, with no upload, no account and no signup.
HTTP Basic auth encodes credentials as Base64 inside the Authorization header, and this tool lets you encode new values or paste an existing one to decode and check its contents. All encoding and decoding happen locally in the browser, so your input is never sent anywhere and there is zero server-side retention. Note that Base64 is encoding, not encryption, so Basic auth should always be used over HTTPS. It is free with no signup required.