BMP is one of the oldest image formats. It stores every pixel without compression, which makes it simple, and that is why some older Windows programs, embedded screens, game tools and scripts still ask for it. If a program only accepts BMP, converting your PNG gets you there.
The main thing to expect is size. Because nothing is compressed, a BMP takes about three bytes per pixel, so a full HD image of 1920 by 1080 pixels is around 6 MB, however simple the picture. BMP also has no transparency in this converter, so transparent areas of your PNG are filled with white. The pixels themselves are not changed: there is no quality setting, because nothing is thrown away.
The pixel dimensions never change, each file keeps its name with only the extension swapped, and no metadata or watermark is added. Everything runs in your browser, so your images are never uploaded.
Because BMP is so simple, it is easy for other programs to read. That makes it handy for test images, scripts that read raw pixels, and tools that predate PNG. Convert one file first to check that your program accepts it, then convert the rest in one go and download them as a ZIP.
Tip: BMP is for compatibility, not for sharing. If you only need a smaller file, PNG or WebP keeps the same pixels in much less space.
PNG compresses the picture and BMP does not. A BMP stores every pixel in full, about three bytes each.
No. BMP stores the pixels exactly, so nothing is lost beyond the transparency, which BMP cannot hold.
Transparent areas become white, because the BMP written here has no transparency.
A standard 24-bit uncompressed BMP, which almost every program that reads BMP can open.
Yes. Add them all, convert once and download a single ZIP. Only the extension changes. A file named holiday.png becomes holiday.bmp.
No. The conversion happens in your browser and the files never leave your device.