In-Depth Guide to HTTP Basic Authentication & Base64 Headers
HTTP Basic Authentication is one of the simplest and most widespread authentication schemes for REST APIs, webhooks, and internal services. Our zero-upload, client-side generator lets you encode credentials securely without risk of password leaks or server logs.
Step-by-Step Instructions
- 1
Enter Username or API Key
Type or paste your service username, client ID, or API key into the username field.
- 2
Enter Password or Token
Enter your password, API secret, or Personal Access Token (PAT) into the password field.
- 3
Generate Base64 Header
Click "Generate Header" to combine credentials (username:password) and compute the Base64 encoding.
- 4
Copy for cURL or Postman
Click "Copy Header" to paste into request headers, or copy the raw Base64 token for custom scripts.
Key Features & Benefits
100% Client-Side Privacy
Encoding is executed entirely in your local browser using window.btoa(). Your credentials are never sent to any server.
Instant Header Generation
Instantly constructs the standard "Authorization: Basic <base64>" header for API calls and microservices.
Dual Copy Controls
Easily copy either the complete HTTP header or the isolated Base64 string depending on your API client requirements.
RFC 7617 Compliant
Strict adherence to standard HTTP Basic Authentication specifications for seamless interoperability with Nginx, Apache, and API gateways.
Frequently Asked Questions
How does HTTP Basic Authentication encode credentials?
According to RFC 7617, the username and password are joined with a single colon delimiter (username:password). The combined string is then encoded using standard Base64 and prefixed with the word "Basic " in the HTTP Authorization header.
Is Base64 encoding considered encryption?
No. Base64 is an encoding format designed for transmitting binary data across text-based protocols, not an encryption method. Anyone can decode a Base64 string. Therefore, Basic Auth must always be served over encrypted HTTPS (TLS) connections.
Are my username and password sent to any server when using this tool?
Never. All encoding is performed locally inside your browser memory using JavaScript. No telemetry, analytics, or server logs capture your credentials.
How do I use this generated header in a cURL command?
You can pass the header directly using the -H flag: curl -H "Authorization: Basic <your-base64-string>" https://api.example.com or use curl -u "username:password" https://api.example.com.