Encode API Data in Base64

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

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Text to encode

API tips

🔌

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

🔑

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

🛡️

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

💡

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

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Enter your data into the tool above. Everything stays local to your browser.

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The tool processes your data instantly in your browser using JavaScript. No server, no waiting.

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Get your result instantly. Nothing is stored after you leave the page — complete privacy.

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Encode Images to Base64 for CSS

Convert small images and icons to Base64 data URLs

Encode Files to Base64 for Email

Encode file attachments to Base64 for MIME email c

Decode and Inspect JWT Tokens

Decode the header and payload sections of a JSON W

Encode Binary Data for Text Transfer

Encode files or binary data to Base64 so they can