Encode Files to Base64 for Email

Encode file attachments to Base64 for MIME email construction or debugging email API payloads.

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Text to encode

Email tips

📧

SMTP email attachments are Base64-encoded within the MIME structure. Email APIs like SendGrid and Mailgun accept Base64-encoded file content.

🔍

Paste a Base64 string from an email payload here to decode and verify the attachment content during API debugging.

📦

For the SendGrid API, encode your attachment file as Base64 and pass it in the "content" field of the attachments array.

💡

Large attachments should use a file storage URL instead of Base64 embedding. Base64 increases size by ~33% — use it for files under 1 MB.

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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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