What This Tool Does
This tool converts an image file into a base64-encoded data URI, ready to paste directly into HTML, CSS, or Markdown. Drop or browse a PNG, JPEG, GIF, WebP, SVG, or AVIF image, and it's instantly encoded into a self-contained string that can embed the image without a separate file or network request.
How to Convert an Image to Base64
Drag an image onto the upload zone or click to browse for one. The image is read and encoded immediately, showing a live preview alongside the file's MIME type and size. Switch between the Data URI, Base64, HTML, CSS, and Markdown tabs to copy the output format you need.
Data URI, HTML, CSS, and Markdown Output
The Data URI tab gives the full data:image/...;base64,... string, ready to drop into a src or url() attribute. Base64 gives just the encoded string on its own, for cases where the MIME prefix is added elsewhere. HTML, CSS, and Markdown give complete, ready-to-paste snippets, an img tag, a background-image declaration, and an image reference, each with the data URI already embedded.
Why Base64-Encode an Image
Embedding an image as base64 removes the need for a separate file request, useful for small icons, inline email images, single-file HTML exports, or CSS backgrounds where an extra network round trip isn't worth it. It also keeps an image bundled directly inside a stylesheet, document, or component instead of as a separate asset to manage.
Base64 Encoding Overhead and When to Avoid It
Base64 encoding increases file size by roughly 33%, since every 3 bytes of binary data become 4 characters of text. That overhead, plus losing the browser's ability to cache the image separately, makes base64 a poor fit for large photos or any image reused across multiple pages, it's best reserved for small, one-off images like icons or logos. Use it to convert image to base64 online as an image to data uri converter, a png to base64 converter or jpg to base64 converter, a base64 image encoder online that outputs an image to base64 string, or to convert photo to base64 for an image to css background base64 rule or an image to html img tag base64 snippet.