Convert images to Base64 and decode back online free. Supports PNG, JPG, WebP and GIF. Instant results, browser-based, no install.
Drag & drop an image or click to select
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Image Base64 Converter is a free online tool that encodes images to Base64 strings or decodes Base64 back to images.
It's used for email attachments, inline CSS background images, API data transmission, and more.
Yes — every three bytes become four characters, so the payload grows by roughly 33 %. That trade is worth it for icons and 1-2 KB images where you save an HTTP request, but embedding a few-hundred-KB photo bloats the HTML and loses browser caching entirely.
Yes — switch to decode mode, paste the string and download the restored image. A `data:image/png;base64,` prefix can be left in place, and if the string has no prefix you only need to pick the output format.
In CSS it works well for small icons and patterns because it removes extra requests. For email signatures it is a poor fit: Gmail and Outlook frequently block data-URI images, so hosting the file and linking it by URL is the reliable route.