Image to Base64 β data URI encoder
Encode an image to a Base64 data URI (with ready img and CSS snippets) or decode one back, in your browser.
π Runs entirely in your browser. Your input and output are never sent to a server or stored β fully private.
π Encoding happens in your browser β your image is never uploaded.
About this tool
This tool encodes an image into a Base64 data URI you can paste straight into HTML, CSS or JSON, and it can also decode a data URI back into a downloadable image. Drop in a file to get the data string plus ready-made img-tag and CSS-background snippets β handy for embedding small icons inline and saving an extra network request. The encoding happens entirely in your browser, so your image is never uploaded to a server.
Frequently asked questions
When should I embed an image as Base64?
Base64 works best for small, frequently used graphics like icons or a logo, where inlining them into your HTML or CSS removes a separate network request. For large photos it is usually better to keep a normal image file, because Base64 makes the data roughly a third larger.
Why is the encoded text bigger than the original image?
Base64 represents binary data using only printable characters, which adds about 33 percent of overhead. That trade-off is fine for tiny assets you want to inline, but it is the reason large images are better left as separate files.
Is my image uploaded during encoding?
No. The image is read and converted to Base64 locally in your browser, so it stays on your device and is never sent to or stored on a server.