Is Basic Auth secure?

The credentials are only Base64-encoded, not encrypted, so Basic Auth should always be used over HTTPS.

Can I decode an existing header?

Yes, switch to Decode mode and paste the Base64 token or full Authorization header value.

Does this tool send my credentials anywhere?

No, encoding and decoding happen entirely in your browser.

Is my data uploaded to a server?

No. This tool runs entirely in your browser using standard web APIs, so your input never leaves your device and nothing is logged or stored on our servers.

Does it work offline and on mobile?

Yes. Once the page has loaded it keeps working without a network connection, and the layout is responsive so it stays usable on phones and tablets.

Basic Auth Header Generator

Build or decode an HTTP Basic Authorization header.

Support

Works Offline

Privacy First

No Login

No API

Mode

Credentials

Username

Password

Result

Header

curl snippet

Shell

curl -u "admin:secret123" https://api.example.com/resource

fetch snippet

CSS

fetch("https://api.example.com/resource", {
  headers: { Authorization: "Basic " }
});

About the Basic Auth Header Generator

Encode a username and password into an HTTP Basic Authorization header, or decode an existing header back into its username and password. Includes ready-to-copy curl and fetch snippets.

Examples

Encode credentials

admin:secret123

Output

YAMLAuthorization: Basic YWRtaW46c2VjcmV0MTIz

Keyboard shortcuts

Copy the main outputCtrl / ⌘ + Shift + C
Download the resultCtrl / ⌘ + S
Share this toolCtrl / ⌘ + Shift + S
Reset the inputsAlt + R
Open the tool search paletteCtrl / ⌘ + K

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Frequently asked questions

Comments

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Version 1.0.0 · Updated 2026-08-10 · Runs entirely in your browser