How to Convert an Image to Base64 — Free, No Software Needed

What Is Base64 Encoding?

Base64 converts binary data (like an image file) into a text string made of letters, numbers, and a few symbols. This text can be embedded directly into HTML, CSS, or JSON — eliminating the need for a separate image file and an extra HTTP request.

A base64-encoded image looks like this:

data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAA...

When to Use Base64 Images

How to Convert an Image to Base64

1. Open the Image to Base64 tool
2. Drop your image file (JPG, PNG, WebP, SVG, GIF)
3. Copy the generated base64 data URI
4. Paste it into your HTML, CSS, or code

The conversion runs entirely in your browser — nothing is uploaded.

Using Base64 in HTML

<img src="data:image/png;base64,iVBORw0KGgo..." alt="icon" />

Using Base64 in CSS

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

Size Considerations

Base64 encoding increases file size by roughly 33%. A 3 KB PNG becomes about 4 KB of text. For small icons and UI elements, this trade-off is worth it because you save an HTTP request. For anything larger, serve the image as a regular file.

Tips

• Compress images first with the Image Compressor to keep the base64 string short
• Use SVG when possible — SVG files are already text-based and often smaller than base64 raster images
• Don’'t base64-encode images in CSS files that are cached separately — you lose the caching benefit
• Convert to WebP with the Image Converter before encoding for smaller output

Try It Now

Use our free Image to Base64 converter to generate data URIs instantly — no signup, no upload, runs in your browser.