Image to Base64

A data URI embeds a file directly inside text as a long encoded string, usually starting with data:image/png;base64,. It lets you place an image in HTML or CSS without a separate file request, which can be handy for tiny icons in emails or single-file HTML documents.

Yes. Base64 encoding represents every three bytes of data as four text characters, so the encoded string is about 33 percent larger than the original binary file. For anything but small assets, a normal image file served with caching is smaller and faster.

Base64 is best for very small, frequently reused assets such as tiny icons, simple patterns, or a single-file HTML report you want to email. Avoid it for photographs, hero images, or anything animated, because it inflates the document and blocks caching.

If you keep the original format, the data URI contains the exact same bytes as your file, so nothing changes. If you choose to re-encode as WebP or AVIF, the image is re-rendered and re-compressed first, which changes the pixels slightly.

Yes. Paste it as the value of a background-image or url() function. The CSS snippet the tool provides is ready to copy. Remember that large data URIs make stylesheets heavy, so keep them small.

The practical limit is your device memory and the size of the resulting document. Very large images produce enormous strings that can freeze an editor, so for anything over a few hundred kilobytes it is better to use a regular image file.