Image to Base64 Privacy: All processing runs locally

How It Works

This tool converts any image file into a Base64-encoded data URI string using the FileReader API in your browser. When you select or drag an image, it is read as a data URL, which includes the MIME type and the Base64-encoded binary data of the image.

A Base64 data URI looks like data:image/png;base64,iVBORw0KGgo... and can be used directly in HTML <img> tags, CSS background-image properties, or JavaScript code. This eliminates the need for separate image file requests, which can improve page load performance for small images.

The tool provides four output formats: the full data URI (ready for direct use), raw Base64 string (without the data URI prefix), an HTML <img> tag with the data URI embedded, and a CSS background-image declaration. Each format is ready to copy and paste into your code.

Base64 encoding increases the data size by approximately 33%, so this technique is best suited for small images like icons, logos, and decorative elements. For larger images, linking to an external file is usually more efficient. All conversion runs locally in your browser with complete privacy.