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Image to Base64 Converter

Upload an image and get a Base64-encoded data URI you can embed directly in HTML or CSS.

Base64 Encoder

Use this tool directly in your browser — no signup required.

Use Base64 Encoder

100% private — files are processed locally and never uploaded.

How to Image to Base64 Converter

  1. 1

    Upload your image

    Select a PNG, JPEG, GIF, SVG, or WebP file from your device.

  2. 2

    Get the Base64 string

    The tool reads the file, encodes it as Base64, and wraps it in a data URI with the correct MIME type (e.g., data:image/png;base64,...).

  3. 3

    Embed in your code

    Paste the data URI into an img src attribute, a CSS background-image url(), or anywhere that accepts image URLs.

Inline Images Without Extra HTTP Requests

Every image on a web page normally requires a separate HTTP request. For small icons, favicons, and UI elements, the overhead of the request can be larger than the image itself. A data URI embeds the image directly in the HTML or CSS, eliminating that round trip entirely.

The syntax is straightforward: data:image/png;base64,iVBORw0KGgo... — the browser reads the MIME type, decodes the Base64, and renders the image. No network request, no 404 risk, no CORS issues. The image is bundled right in the document.

This approach works best for small images (under 10-20 KB). Larger images bloat the HTML/CSS file, defeat caching (the image can't be cached separately), and increase parse time. For anything over 20 KB, a regular image file served with proper cache headers is more efficient.

Frequently Asked Questions

What image formats are supported?

PNG, JPEG, GIF, SVG, and WebP. The tool detects the file type and sets the correct MIME type in the data URI automatically.

How much larger is the Base64 version of my image?

About 33% larger than the original file. Base64 encoding increases data size by a third. A 10 KB PNG becomes roughly 13.3 KB of Base64 text. For small UI elements, the savings from eliminating an HTTP request still make it worthwhile.

Can I use data URIs in CSS?

Yes. Use them in background-image: url(data:image/png;base64,...); — this is common for small background patterns, icons, and sprites in CSS files. It keeps the CSS self-contained with no external dependencies.