Basic Auth Decoder
Decodes HTTP Basic Authentication credentials from a Base64 Authorization header.
What Basic Auth Decoder does
The Basic Auth Decoder on Base64.Guru converts Base64-encoded HTTP Basic Authentication headers into readable username and password pairs. Users input an encoded authorization string, and the tool outputs the original credentials in clear text, revealing the account details hidden behind the obfuscated header. This is essential for security researchers and developers analyzing network traffic or API logs where credentials appear in encoded form. The site handles single or multiple headers simultaneously, processing various input layouts. The interface presents a straightforward decoding function without unnecessary complexity, focusing on the core task of reversing Basic Authentication encoding. It reveals the username:password combination that was originally used to generate the header, making encoded traffic readable for inspection or troubleshooting.
How to use the Base64.Guru Basic Auth Decoder
- 1
Paste the Basic Authorization header string (with or without the 'Basic' prefix) into the input field
- 2
Select the separator format if decoding multiple headers, or leave on auto-detect
- 3
Click the 'Decode Basic Auth' button to process the input
- 4
View the decoded credentials in username:password format displayed in the output area
Best for
Security researchers and developers who need to decode Basic Authentication headers from network traffic, API logs, or configuration files to inspect credentials without manual Base64 decoding.
Limitations
- No unit switching or format customization beyond separator selection
- Results depend on the input being valid Base64-encoded Basic Auth headers
- Does not provide encryption or secure handling of decoded credentials
Basic Auth Decoder FAQ
- Can I decode multiple Basic Auth headers at once?
- Yes, the tool supports newline, comma, semicolon, tab, pipe, and JSON array formats, with automatic detection enabled by default. Paste multiple headers using your preferred separator and the decoder will process them together.
- Do I need to include the 'Basic' prefix when pasting my header?
- No, the tool automatically strips the 'Basic' prefix if present. You can paste just the Base64-encoded string or the full 'Basic <token>' format and it will still decode correctly.
- What happens if I paste an invalid Base64 string?
- The tool will attempt to decode whatever is pasted, but invalid Base64 characters or improperly formatted strings may produce errors or unexpected output. It is designed for standard HTTP Basic Authentication headers.
- Is the decoded output stored or saved by the site?
- No, the decoding happens client-side in your browser. The tool does not store or transmit your input data to servers, making it safe for decoding sensitive authentication credentials.
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