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Basic Auth Encoder / Decoder

Base64 Token
YWRtaW46c2VjcmV0MTIz
Authorization Header
Authorization: Basic YWRtaW46c2VjcmV0MTIz
curl Flag
-H "Authorization: Basic YWRtaW46c2VjcmV0MTIz"
⚠️ Security note: Basic Auth encodes credentials as base64 — not encryption. Always use HTTPS to prevent credentials from being intercepted.

Last updated:

This tool is provided as-is for convenience. Output should be verified before use in any production or critical context.

Agent Invocation

Best Path For Builders

Browser workflow

Runs instantly in the browser with private local processing and copy/export-ready output.

Browser Workflow

This tool is optimized for instant in-browser execution with local data handling. Run it here and copy/export the output directly.

/basic-auth-encoder/

For automation planning, fetch the canonical contract at /api/tool/basic-auth-encoder.json.

Frequently Asked Questions

What is Basic Auth Encoder?
Basic Auth Encoder is a free online tool that encodes a username and password into an HTTP Basic Authentication header (Base64 encoded). It also decodes existing tokens back to plaintext credentials.
How does HTTP Basic Authentication work?
Basic Auth combines your username and password as 'username:password', Base64-encodes the result, and sends it in the Authorization request header as 'Authorization: Basic <token>'. Note: Base64 is encoding, not encryption — always use HTTPS.
Is Basic Auth Encoder free?
Yes. Completely free with no account required.
Does it send my credentials to a server?
No. All encoding and decoding uses the browser's built-in btoa()/atob() functions. Your credentials never leave your device.
Is Basic Auth secure?
Basic Auth is only secure over HTTPS. The Base64 encoding is trivially reversible — it is not encryption. Always use HTTPS to prevent credentials from being intercepted in transit.