Basic Auth Generator — Free Online HTTP Authorization Header Tool

Basic Auth Generator — Free Online HTTP Authorization Header Tool. Free online basic auth generator. Create Base64-encoded HTTP Authorization headers from username and password — instantly, no server required.

Generate HTTP Basic Authentication headers instantly with our free online basic auth generator. Enter your username and password and get a ready-to-use Authorization: Basic header — encoded in Base64 per RFC 7617.

Works for cURL, Postman, REST APIs, Nginx, Apache .htpasswd, and any HTTP client. Related: Base64 String Converter, JWT Generator. All encoding runs in your browser — your credentials never leave your device.

Basic Auth encodes username:password in Base64 and sends it in the Authorization header. Our tool makes it fast and error-free. Copy the header and paste it directly into your HTTP client or script. 100% free and private.

Frequently asked questions

How do I create an HTTP Basic Authentication header?

Enter the Username and Password. The tool joins them with a colon, encodes username:password in Base64 (UTF-8) and shows the full line Authorization: Basic followed by the encoded value. Click Copy header to put it on your clipboard.

How do I use the generated header with curl or Postman?

In curl, pass the copied line with -H, for example curl -H "Authorization: Basic dXNlcjpwYXNz" followed by your URL, or let curl build it for you with -u user:pass. In Postman, add a header named Authorization whose value is Basic plus the encoded string.

Is Basic Auth secure?

Basic Auth is only encoded, not encrypted: anyone who sees the header can decode it with any Base64 decoder and read the password. Only send it over HTTPS, and prefer tokens or OAuth for public APIs.

Can the username contain a colon?

No. Under RFC 7617 the first colon separates the username from the password, so a colon in the username would be misread by the server. Colons inside the password are fine.

Are my username and password sent to a server?

No. The authorization header is built in your browser as you type, and the username and password are not uploaded or stored.

How to use this online tool

Basic Auth Generator — Free Online HTTP Authorization Header Tool is designed for fast browser workflows when you need to format, validate, convert, decode, encode, generate, or inspect data without opening a heavy desktop app. Start with the input field or visible options, review the result, then copy or download the output for the next step.

Private processing in your browser

Basic Auth Generator — Free Online HTTP Authorization Header Tool keeps the normal processing step local in your browser. That is useful for code snippets, tokens, documents, configuration values, text samples, and other material that should not be sent to a remote service unless you explicitly choose to share it.

When this tool is useful

Use Basic Auth Generator — Free Online HTTP Authorization Header Tool for repeatable developer tasks, technical documentation, QA checks, quick conversions, debugging, content cleanup, and internal team workflows. The page focuses on clear inputs, immediate feedback, and output that is easy to reuse in code, reports, tickets, emails, or notes.

Practical tips

Before copying the final result, check important details such as spacing, casing, filenames, encoding, token structure, line breaks, or output format. Small checks prevent mistakes when the result is reused in source code, API requests, documentation, spreadsheets, or shared files.