Which image formats are supported?

PNG, JPEG, GIF, WebP, SVG, and other formats supported by your browser's FileReader API.

When should I use a Base64 data URI instead of a regular image?

For small images (under 5 KB) that would benefit from saving an HTTP request. For larger images, an external file is more efficient due to browser caching.

Can I use the output in CSS?

Yes. Use it as a CSS background-image: url("data:image/png;base64,...") in any stylesheet or inline style.

Best Free Online Image to Base64 Converter

Embedding images directly in HTML or CSS using Base64-encoded data URIs eliminates the need for a separate HTTP request, which can improve load time for small, frequently used images like icons, inline logos, and email graphics. devtoolkit.sh's Image to Base64 Converter transforms any uploaded image into its Base64 data URI representation (data:image/png;base64,...). The output can be used directly in HTML img src attributes, CSS background-image values, SVG image elements, and email templates that need to work without external image hosting. The tool shows the original file size and the Base64 size so you can evaluate the size tradeoff. Conversion happens entirely in your browser using the FileReader API — the image file is never uploaded to any server. This private processing model makes the tool safe for converting logos, internal diagrams, confidential screenshots, and other images that should not be transmitted to third-party services, even for a quick and routine format conversion.

Drop an image here or click to browse

Supported: PNG, JPEG, GIF, WebP, SVG

FAQ

Which image formats are supported?: PNG, JPEG, GIF, WebP, SVG, and other formats supported by your browser's FileReader API.
When should I use a Base64 data URI instead of a regular image?: For small images (under 5 KB) that would benefit from saving an HTTP request. For larger images, an external file is more efficient due to browser caching.
Can I use the output in CSS?: Yes. Use it as a CSS background-image: url("data:image/png;base64,...") in any stylesheet or inline style.