Question 1

Is my image uploaded to any server during Base64 encoding?

Accepted Answer

No. The conversion uses the browser's native FileReader API entirely in client memory. No files are uploaded to any server.

Question 2

What is the file size overhead of Base64 encoding?

Accepted Answer

Base64 encoding increases file size by approximately 33% due to representing binary 8-bit octets using 6-bit ASCII characters.

Question 3

Which image formats are supported?

Accepted Answer

All standard browser-supported image formats are supported, including PNG, JPEG, SVG, WebP, GIF, and ICO.

Question 4

Can I use the Base64 output directly in CSS or HTML?

Accepted Answer

Yes. The tool outputs standard data URI strings formatted for <img src='...'> or CSS background-image: url('...').

Question 5

How do I decode a Base64 string back into an image?

Accepted Answer

Switch to the Decode tab, paste your Base64 data URI string, and the image renders immediately with a one-click download option.

Question 6

What happens if a Base64 string is truncated or invalid?

Accepted Answer

The client-side decoder validates the data URI header and base64 alphabet, displaying a clear syntax notice if corrupted.