Should I encode api key to base64 header with Basic prefix?

HTTP Basic expects Base64 of user:password. Prepend "Basic " plus the encoded value in the Authorization header.

Are keys sent to SwiftToolsKit servers?

No. Encoding executes entirely in your browser tab.

Switch to decode mode with the output to confirm round-trip before curl tests.

Name: Encode API Key to Base64 Header — Free Tool | SwiftToolsKit
Author: SwiftToolsKit

Some gateways expect client_id:client_secret or raw keys transformed to Base64 before placing them in Authorization headers.

Enter the key material in encode mode to get the Base64 form you combine with Basic auth schemes or custom headers.

Never commit secrets to git—use this local encoder for one-off tests, then store credentials in your vault.

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client_id:client_secret

my-client-id:my-client-secret

Base64 for Basic header

bXktY2xpZW50LWlkOm15LWNsaWVudC1zZWNyZXQ=

Should I encode api key to base64 header with Basic prefix?: HTTP Basic expects Base64 of user:password. Prepend "Basic " plus the encoded value in the Authorization header.
Are keys sent to SwiftToolsKit servers?: No. Encoding executes entirely in your browser tab.
Can I decode to verify?: Switch to decode mode with the output to confirm round-trip before curl tests.