API Key Base64 Encoder
Encode API keys to Base64 online free. For HTTP Basic Auth headers.
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API Key Base64 Encoder
Encode API keys or tokens to Base64 for Basic Auth headers.
Why it matters: API-key encoding produces the value expected by Authorization: Basic headers.
How to use Base64
- 1 Type or paste your text into the input box above.
- 2 Click Encode to turn text into Base64, or Decode to convert it back.
- 3 Toggle URL-safe mode for links, or UTF-8 for emoji and accents.
- 4 Use JWT / API-key / JSON modes for developer workflows.
- 5 Copy the result or open a specialized tool from the hub below.
Frequently Asked Questions
Combine username and password with a colon (user:pass), then Base64 encode the result. Prepend "Basic " to the output for the header value.
Only over HTTPS. Base64 is encoding, not encryption. Anyone intercepting the traffic can easily decode it if not using SSL/TLS.
Yes. Use our Bulk mode to generate headers for multiple test accounts simultaneously. Encoding and decoding happen entirely in your browser, so your text never leaves your device. The tool supports standard, URL-safe, and UTF-8 Base64 modes.
Yes. The HTTP standard requires the header to be: `Authorization: Basic [encoded-string]`. Our tool shows the full header for easy copying.
Only over HTTPS. Base64 is encoding, not encryption — anyone intercepting the traffic can decode it without SSL/TLS. Encoding and decoding happen entirely in your browser, so your text never leaves your device.
All Base64 Tools
Encode, decode, and inspect Base64 for web, APIs, and JWTs.
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