Image to Base64 Encoder — Convert Images to Data URIs

A Base64 encoded image (also called a data URI) is a text representation of an image file. Instead of referencing an external image file, you embed the image data directly in your HTML, CSS, or JavaScript. This eliminates an HTTP request and can improve page load performance for small images.

How to Use Base64 Images in HTML

<img src="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAA...">

How to Use Base64 Images in CSS

.logo {
  background-image: url("data:image/png;base64,iVBORw0KGgo...");
}

When to Use Base64 Images

• Small icons and logos used in email templates (avoids blocked images)
• Inline CSS or HTML where external image hosting is not available
• Embedding images in JSON API responses or configuration files
• Single-file HTML documents that need to be fully self-contained

Limitations

Base64 encoding increases file size by approximately 33%. Large images encoded as Base64 can bloat HTML files and should be avoided — use external URLs for images over 5–10 KB.