Image to Base64: Convert Images to Data URIs Instantly

Data URIs let you embed images directly into HTML or CSS without HTTP requests. Converting an image to Base64 is the first step to creating a data URI.

What Is a Data URI?

A Data URI looks like this:

data:image/png;base64,iVBORw0KGgo...

It contains the MIME type and the Base64-encoded image data. You can use it anywhere a URL is expected - src attribute, CSS background-image, or even in stylesheets.

When to Use Base64 Images

• Small icons - icons under 5KB embeded as data URIs reduce HTTP requests.
• Email HTML - many email clients block external images. Data URIs can bypass this.
• Offline-first apps - data URIs work without network access.
• CSS-only designs - embed small images directly in your stylesheet.

When NOT to Use Base64 Images

• Large images - Base64 encoding adds ~33% overhead. A 100KB image becomes ~133KB.
• Cacheable resources - external images can be cached by the browser. Data URIs cannot.
• Frequently updated images - changing a data URI requires updating the HTML or CSS that contains it.

How to Convert with SnapSum

Using the SnapSum Image to Base64 tool:

• Upload or drag-and-drop your PNG, JPG, GIF, or WebP image
• The tool outputs the complete data URI ready to copy
• Also provides the raw Base64 string (without the data:mime prefix) for API usage
• All processing happens in your browser - image data never leaves your device

Using Base64 Images in Code

In HTML:

<img src="data:image/png;base64,iVBOR..." alt="icon">

In CSS:

background-image: url("data:image/png;base64,iVBOR...");

Frequently Asked Questions

Does Base64 encoding affect image quality?

No. Base64 is a lossless encoding. The decoded image is byte-for-byte identical to the original.

Can I convert SVG to Base64?

Yes, but for simple SVGs, it is often better to use them inline (paste the SVG markup directly into HTML). This allows CSS styling of the SVG elements.