Free Base64 Image Converter Online - Convert Images to Base64

Use our free Base64 image converter to convert any image to Base64 format or decode Base64 strings back to images. This online tool processes everything in your browser, so your images never leave your device. Perfect for developers who need to embed images in HTML, CSS, or JSON.

What is Base64 Image Encoding?

Base64 image encoding is a method of converting binary image data (like PNG, JPEG, or GIF files) into a text string. The encoded string starts with a data URI prefix like "data:image/png;base64," followed by the Base64-encoded image data. This complete string can be used as the src attribute of an img tag or as a background-image in CSS.

Common Use Cases for Base64 Images

• Email Templates - Embed images directly in HTML emails to ensure they display without requiring external hosting
• CSS Backgrounds - Include small icons or patterns directly in your CSS files
• Single-Page Apps - Bundle small images with your JavaScript code
• API Responses - Return images as part of JSON API responses
• Markdown Documents - Embed images in portable Markdown files
• Data URIs - Create data URIs for use in HTML img tags or CSS

How to Use Base64 Images in HTML

To use a Base64 image in HTML, set the src attribute to the full data URI: <img src="data:image/png;base64,iVBORw0KGgo..." alt="My Image" />

How to Use Base64 Images in CSS

In CSS, use the data URI as a background-image: .element { background-image: url(data:image/png;base64,iVBORw0KGgo...); }

Advantages of Base64 Images

• Reduces HTTP requests for small images
• Images are bundled with code, simplifying deployment
• Works in email clients that block external images
• No cross-origin or CDN configuration needed

Limitations of Base64 Images

• Increases file size by approximately 33%
• Not cacheable separately by browsers
• Not recommended for large images (over 10KB)
• Increases initial page load size

Frequently Asked Questions

What image formats can be converted to Base64?

All common formats including PNG, JPEG, GIF, WebP, SVG, BMP, and ICO can be converted.

Is there a size limit for Base64 images?

While there's no technical limit, keep Base64 images under 10KB for optimal performance.

Can I convert Base64 back to an image?

Yes! Use the "Base64 to Image" mode in this tool to decode and download the image.