Security

Basic Auth Header Generator

Generate the HTTP Basic Authorization header value from a username and password.

Last reviewed: April 30, 2026Free toolMethodology

Basic Auth Header Generator

These fields start with sample inputs. Keep them or replace them, then run the tool to show a fresh result.

Result

Calculating the sample result.

Why it matters

Basic auth still appears in internal tools, legacy integrations, and quick API tests, and developers often need the exact header value fast.

When to use

  • Testing legacy APIs
  • Preparing manual requests in curl or Postman
  • Verifying what a Basic auth header should look like

Inputs & Outputs

Inputs

  • Username and password are joined with a colon before being Base64-encoded.

Outputs

  • Header value shows the full `Authorization: Basic ...` string ready to copy.
  • Credential pair preview helps confirm the exact string being encoded.

Basic auth method

The tool joins username and password with a colon, Base64-encodes the result, and prefixes the final value with `Basic`.

Authorization header = Basic + Base64(username:password)

Worked example

1

API test setup

A developer needs the Basic auth header for username `demo` and password `s3cret!`.

Inputs

  • Username: demo
  • Password: s3cret!

Steps

  • Join credentials with a colon
  • Base64-encode the pair
  • Prefix with Basic

Result

  • The final header can be pasted directly into a test request.

Edge cases & caveats

  • Basic auth is only safe when sent over HTTPS.
  • The encoded credentials are easily reversible, so treat them like plain secrets.

Frequently Asked Questions

Is Basic auth encrypted?

No. The credentials are only Base64-encoded. Transport security must come from HTTPS.

Can I use this header in curl?

Yes. The generated value can be copied into an `Authorization` header for manual request tools.

Keep going

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