What is a Base64 data URL and when should I use it?

A Base64 data URL encodes a file as a text string in the format data:[mime];base64,[data]. Use it to embed images directly in HTML src attributes, CSS background-image, or JSON payloads — eliminating the need for a separate HTTP request.

What file types can be encoded to Base64?

Any file type can be encoded — PNG, JPEG, SVG, WebP, ICO, GIF, and others. The resulting data URL will include the correct MIME type for the file.

Does Base64 encoding increase file size?

Yes. Base64 encoding increases size by approximately 33% compared to the binary file. For large images, this trade-off may not be worth it — Base64 is most practical for small icons and logos.

Is my file uploaded to a server when encoding?

No. The encoding runs entirely in your browser using the FileReader API. Your file never leaves your device.

Base64 Encode

Convert asset to text-string for direct embedding

Drag and drop your file here

or click to browse files • Max 50MB

Tips:

•Embed the data URI directly in CSS: background-image: url('data:image/png;base64,...')
•Use it in an <img src="..."> tag or CSS background-image — no separate file needed
•Base64 encoding adds ~33% to the file size; best used for small icons under 10 KB
•Inline Base64 icons avoid an extra HTTP request, which can improve page load performance

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