Question 1

What is a Base64 image?

Accepted Answer

Base64 is an encoding scheme that converts binary data, such as an image file, into a string of ASCII characters. This allows image data to be embedded directly in HTML, CSS, or JSON without needing a separate file request to a server.

Question 2

What image formats are supported?

Accepted Answer

The tool accepts any image format your browser supports as a file upload: PNG, JPEG, WebP, GIF, SVG, BMP, ICO, and more. The MIME type is detected automatically and included in the Data URI prefix.

Question 3

Is my image uploaded to a server?

Accepted Answer

No. The entire conversion happens in your browser using the FileReader API. Your image never leaves your device, which makes this tool safe for sensitive or private images.

Question 4

Why is there a 1 MB warning?

Accepted Answer

Base64 encoding increases file size by approximately 33 percent. A 1 MB image produces a Base64 string of about 1.37 MB. Very large Base64 strings can slow down page rendering when embedded in HTML or CSS, so the warning helps you decide whether to embed or use a separate image file.

Question 5

How do I use the CSS background output?

Accepted Answer

Copy the CSS background-image value and paste it into your stylesheet. It will set the element background to your encoded image without any external file dependency — useful for small icons or decorative images in single-file apps.

Bild zu Base64

Haeufig gestellte Fragen