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Authorization Header Builder
Build a local UTF-8 Basic or opaque ASCII Bearer header without transmitting credentials.
Username and password, Opaque Bearer token
authorization.txt, authorization-report.json
Browser only
Runs locally in your browser. Your files, pasted content and generated output are not uploaded. Reset clears this tool’s working data.
This tool needs JavaScript. If it does not load, refresh the page and try again.
How to use this tool
- Choose Basic or Bearer and enter only the selected scheme fields.
- Select Build authorization header. Treat the result and report as credentials.
- Download authorization.txt and authorization-report.json only when appropriate for your local workflow.
Examples
Basic user and an empty password encode the UTF-8 bytes of user: as dXNlcjo=.
Limitations
- Basic credentials are at most 4096 UTF-16 units each and 16384 combined UTF-8 bytes including the colon. The username cannot contain a colon; username and password cannot contain ASCII controls. Valid Unicode scalar text is required.
- Bearer uses a nonempty ASCII token with letters, digits, -, ., _, ~, + and /, followed only by optional terminal = padding; at most 16384 bytes. No trimming or token introspection. Unused scheme fields are ignored.
- At most 128 KiB combined downloads and 30 seconds. Basic encoding is reversible, not encryption. No HTTP request, authentication, transmission, server charset negotiation or credential safety certification occurs.
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