Images
Turn your BMP files into PNG in seconds. Everything happens in your browser: nothing is uploaded to any server.
Drag your files here
Or paste them with Ctrl+V. They never leave your device.
It is huge: a photo in BMP takes ten times more space than in JPG. As a PNG the image stays lossless and keeps its transparency.
BMP stores pixels uncompressed, as-is, the way Windows has since its early versions.
Strengths: Very old software and devices that know nothing about compression can read it.
Limits: It is huge: a photo in BMP takes ten times more space than in JPG.
PNG stores images losslessly: every pixel stays exactly the same, and it supports a transparent background.
Strengths: Great for screenshots, logos, charts and any image with text or sharp edges.
Limits: For photographs it is much larger than a JPG or a WebP.
No. The BMP to PNG conversion runs entirely in your browser, with code downloaded from this site and executed on your device. You can check it in the Network tab of the developer tools or by going offline after the page loads.
No: PNG stores the image losslessly, so it stays exactly as it was in the BMP.
Your device’s memory sets the limit: on desktop, images up to about 100 megapixels; on mobile, up to 16.7. If an image is too large you are told before it starts.
Yes. Drop as many BMP files as you like: several are converted at the same time, depending on your processor cores, and when they finish you can download each PNG or all of them in a ZIP.