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Generate Basic Auth headers from username and password. Use when testing APIs; for JWTs use jwt-generator. Input: credentials text. Returns Authorization header. 100% client-side.
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Generates HTTP Basic Authentication headers from a username and password. Enter your credentials to instantly get the complete Authorization header value in the standard 'Authorization: Basic base64encoded' format, ready to use in API requests.
HTTP Basic Auth requires base64-encoding the username:password string. Manually computing this with command-line tools or online converters adds friction when testing APIs that use Basic authentication.
This tool is part of the DevStackIO platform — a collection of free online developer tools from DevStackIO. Browse more free developer resources on DevStackIO.
API developers testing endpoints with Basic Auth, QA engineers writing API tests, and backend developers debugging authentication issues.
Enter the username in the Username field
Enter the password in the Password field
The Authorization header is generated instantly
Copy the full header or just the base64 value
Use Copy Header for curl/Postman or Copy Value Only for tools that add the prefix
Re-generate if you change either credential
admin:password123 → Authorization: Basic YWRtaW46cGFzc3dvcmQxMjM=user: → Authorization: Basic dXNlcjo=:secret → Authorization: Basic OnNlY3JldA==api-user:Tr0ub4dor&3 → Authorization: Basic YXBpLXVzZXI6VHIwdWI0ZG9yJjM=Is Basic Auth secure?
Only over HTTPS. The base64 encoding is not encryption — it's trivially reversible.
Does it handle special characters in passwords?
Yes, all characters are correctly base64-encoded.
Can I use this for OAuth or Bearer tokens?
No, this tool specifically generates Basic Auth headers.
Is my data shared?
No, the encoding happens entirely in your browser.
Why is Basic Auth still used?
It's simple and widely supported, and it's fine for internal tools or HTTPS-only testing.
How do I decode a Basic header?
Decode the base64 portion back to username:password to verify or debug.
Authoritative specifications, standards, and in-depth reading for Basic Auth Generator.
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