Image to Base64 Converter

An image to Base64 converter turns the binary contents of an image file into a Base64 text string, usually wrapped in a data URI such as data:image/png;base64,iVBORw0KG... Base64 is an encoding that represents any binary data using 64 printable ASCII characters, so the resulting string can live directly inside HTML, CSS, JSON, or SVG without needing a separate file request. This converter also runs in reverse: paste a Base64 string or a full data URI and it rebuilds the original image for preview and download.

Developers embed images as Base64 to cut down on HTTP requests, to inline small icons and logos so they appear the instant a page paints, and to ship self-contained files where an image and its markup travel together. A data URI carries its own MIME type, which is why a browser can render data:image/png;base64,... as a picture the moment it parses the attribute. The trade-off is size: Base64 inflates data by roughly one third, so it suits small assets far better than large photos.

This tool does all of its work in your browser. The image is read locally with the File API, encoded with a hand-written Base64 routine, and never uploaded to a server, which keeps private artwork and screenshots on your own machine. Alongside the raw Base64 you get a ready-to-paste data URI, an HTML img tag, and a CSS background-image declaration, plus the decoded byte size so you can judge whether inlining is worth it before you commit.

One practical caution: a data URI is roughly a third larger than the file it encodes and cannot be cached separately by the browser, so inlining anything beyond a small icon usually costs more than the request it saves.