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Basic Auth Generator

Build an HTTP Basic Authorization header from a username and password.

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Quick Tool Overview

The Basic Auth Generator builds an HTTP Authorization header from a username and password, decodes an existing one back to its credentials, and generates matching curl, fetch and axios snippets.

What it does
Builds and decodes Basic auth headers
You give it
A username and password, or an existing header
You get back
The header plus ready-made client snippets
Best for
Testing protected endpoints and internal APIs
Developer Tools Free, unlimited use No sign-up Runs in your browser

About the Basic Auth Generator

HTTP Basic authentication joins the username and password with a colon, Base64-encodes the pair and puts the result in an Authorization header. That is the entire mechanism, which is both why it is so widely used and why it needs HTTPS to be anything other than plaintext.

This builds the header, and also decodes one — paste an existing Authorization value and you get the credentials back, which is a quick way to see why a request is being rejected. Snippets for curl, fetch and axios come with it. A colon in the username is the one thing Basic auth cannot represent, and the tool says so rather than producing a header that silently splits in the wrong place.

Key features of the Basic Auth Generator

Decodes as well as encodes

Paste an Authorization value to see the credentials it carries, which is the quickest way to find out why a request is being rejected.

Client snippets

curl, fetch and axios versions are generated alongside the raw header.

Catches the colon problem

A colon in the username cannot be represented, and the tool says so rather than producing a header that splits in the wrong place.

Correct UTF-8 handling

Non-ASCII credentials are UTF-8 encoded before Base64, which is what modern servers expect.

Says what Base64 is not

The page is explicit that this is an encoding, not encryption, and that Basic auth needs HTTPS to mean anything.

How to use the Basic Auth Generator

  1. 1

    Enter the credentials

    Username and password; a colon in the username is flagged as invalid.

  2. 2

    Copy the header

    The complete Authorization line, ready to paste into a client.

  3. 3

    Take a snippet

    curl, fetch and axios versions are generated alongside.

  4. 4

    Decode an existing header

    Paste a Base64 credential to see the username and password it carries.

Frequently asked questions

No. Base64 is an encoding, not encryption, and anyone who sees the header can decode it instantly. Basic auth is only acceptable over HTTPS, where TLS protects the header in transit.

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