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Image to Base64 Encoder

Upload an image file to convert it into a base64 string. Useful for embedding images directly into HTML, CSS, or JSON.

What is Image to Base64 Conversion?

Image to Base64 conversion encodes the binary data of an image file into a Base64 string that can be embedded directly in HTML, CSS, JavaScript, or JSON without a separate HTTP request. The resulting data URI looks like data:image/png;base64,iVBORw0K... and can be used as the src attribute of an <img> tag, as a CSS background-image URL, or as a value in a JSON payload. This technique eliminates an HTTP round-trip for small images and is commonly used for small icons, logos, and inline email images. The trade-off is that Base64 encoding increases file size by about 33%.

How to Use the Image to Base64 Converter Tool

  1. Click to select or drag and drop your image file (PNG, JPEG, WebP, GIF, or SVG).

  2. The Base64-encoded data URI is generated instantly.

  3. Copy the full data URI (including the data:image/... prefix) to embed directly in HTML or CSS.

  4. Or copy just the Base64 string (without the prefix) for use in JSON APIs or other contexts.

This image to Base64 encoder runs entirely in your browser — no images are uploaded to any server. Supports PNG, JPEG, WebP, GIF, and SVG. Useful for embedding small images in HTML emails, CSS stylesheets, inline HTML, and API payloads.

Need to convert Base64 back to an image? Try our Base64 to Image Converter →

Frequently Asked Questions

Should I Base64 encode all my images? Only small images (under ~5–10KB). For larger images, Base64 encoding increases file size by 33% and the image cannot be cached by the browser separately from the page. HTTP/2 makes separate file requests cheap, so Base64 encoding large images usually hurts performance.

How do I use the Base64 output in HTML? Set it as the src attribute: <img src="data:image/png;base64,iVBOR...">. The data URI includes the MIME type and Base64 data in one string.

Can I use Base64 images in CSS? Yes. Use it as a background-image value: background-image: url('data:image/png;base64,...'). This is commonly used for inline icons in CSS sprite alternatives.

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