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Encode API Data in Base64

Encode credentials, tokens, and payloads to Base64 for use in HTTP headers and API requests.

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API tips

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HTTP Basic Authentication encodes "username:password" in Base64 and sends it as "Authorization: Basic <encoded>" in the request header.

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JSON Web Tokens (JWTs) use Base64URL encoding for their header and payload sections. Paste a JWT to decode and inspect its claims.

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Base64 is encoding, not encryption. It's not secure on its own β€” always transmit Base64 credentials over HTTPS.

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Some APIs require Base64-encoded request bodies or file attachments. Encode your data here and paste directly into your API client.

How It Works

1
Enter
Enter your data into the tool above. Everything stays local to your browser.
2
Process
The tool processes your data instantly in your browser using JavaScript. No server, no waiting.
3
Download
Get your result instantly. Nothing is stored after you leave the page β€” complete privacy.

Why use ours?

βœ“Completely free β€” no hidden costs, ever
βœ“No account, email, or login required
βœ“Files never leave your device
βœ“No file size limits whatsoever
βœ“No watermarks on any output

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Frequently Asked Questions