Lossless in, lossless out
BMP and PNG both keep every pixel exactly as it is. The difference is that PNG compresses the data without losing anything, while BMP often stores it raw. Converting a BMP to PNG gives you the very same image, pixel for pixel, usually in a much smaller file, and in a format that websites, editors, phones and office software all handle without trouble.
That makes BMP to PNG the right conversion for anything where precision matters: screenshots from old programs, diagrams and charts, pixel art and sprites from classic games, interface mockups, scanned line drawings and images with small text. Nothing gets blurred, and you can convert the PNG again later without having lost any detail.
Typical situations
Maybe you're cleaning up an old Windows computer and found a folder of pictures drawn in Paint. Maybe a piece of lab, factory or medical equipment exports its screens as BMP and you need to paste them into a report. Maybe a game modding community shares textures as BMP and your editor prefers PNG. In all of these cases, PNG is the modern equivalent that won't change the content.
If the BMP is a photo and you mainly need a light file for email or an upload form, “BMP to JPG” will usually produce a smaller result. PNG is best when quality must stay exact.
After converting
Once you have a PNG, the rest of the image tools are one click away. “Remove white background” can make a plain background transparent, which is useful for logos and signatures saved as BMP. “Resize image” changes the pixel dimensions, “PNG to SVG” traces a simple graphic into vector shapes, and “Compress image” reduces a PNG to a color palette when it still weighs too much. The file doesn't need to be selected again.
Private, free, unlimited
Everything happens in your browser. Your BMP files are never uploaded or stored on any server, so internal screenshots and work documents stay on your device. There's no account to create, no watermark and no cap on the number of files: select a whole batch and download every PNG together in a ZIP.
Because PNG is lossless, it's also a sensible format for archiving. If you're moving old bitmaps to a new computer or a cloud folder, converting them to PNG saves space without changing a single pixel, and you can always convert a copy to JPG later when you need a lighter file for email.