Image to Base64 Converter

Base64 is a way to encode binary data (like an image) as text. It is used to inline small assets directly into HTML, CSS, or JSON, so a document carries its own image without a separate file request. Instead of hosting a logo file on a server and pointing to it, you can embed the entire image as a string, which travels with the page no matter where it goes.

This tool reads an image file you choose and returns it as a base64 data URL — a string like data:image/png;base64,iVBOR... that begins with the MIME type and ends with the encoded payload.

Everything runs locally in your browser's FileReader API. The file is never sent to a server, so it is ideal for logos, icons, and other small assets you'd rather not upload anywhere. The trade-off to keep in mind is that base64 expands binary data by about a third — a 100KB image becomes roughly a 133KB string — which is why inlined images suit small, reused assets far better than large photographs.

The tool shows you both the full data URL and the bare base64 payload, with a copy button on each, so you can inline it as-is or post-process it however you like. The reported size is the decoded byte length of the image.

A data URL looks like:

data:<mediatype>;base64,<payload>

• mediatype — the file's MIME type, derived from the file you choose (image/png, image/jpeg, image/svg+xml, and so on). • payload — the base64-encoded contents, produced in your browser by the FileReader API.

The file is read entirely in the browser and never transmitted. The reported byte length is the decoded size of the image payload.

Guidance: base64 inflates binary data by about 33%. A 100 KB image becomes roughly a 133 KB string, so it is practical for small assets like logos and icons but wasteful for large photos.