PNG to BMP Converter

What Does This Tool Do?

This tool converts PNG images to BMP (Bitmap) format, the native uncompressed image format for Windows. BMP files store raw pixel data without any compression, which makes them compatible with virtually every Windows application, including older software that may not support modern formats like PNG or WebP. This converter is useful when you need a simple, uncompressed image file for legacy systems, embedded applications, or specific hardware that requires BMP input.

How to Convert PNG to BMP

1. Upload your PNG file — drag and drop or click to browse.
2. Verify the format — the source format is detected automatically.
3. Adjust quality — No quality settings needed for lossless BMP.
4. Click Convert — the conversion happens instantly in your browser.
5. Compare the results — see original vs converted side by side with file sizes.
6. Download — save the converted file to your device.

PNG vs BMP — Key Differences

PNG compresses image data using the DEFLATE algorithm, reducing file size while preserving every pixel perfectly through lossless compression. BMP stores pixels as raw, uncompressed data, which results in files that are significantly larger — often 5 to 20 times the size of the equivalent PNG. PNG supports full alpha transparency, while standard BMP files do not support transparent regions. However, BMP has the advantage of universal compatibility with Windows applications dating back to the earliest versions of the operating system, and it requires zero decompression overhead when loaded into memory.

When to Use BMP Instead of PNG

BMP is primarily useful when working with legacy Windows software, industrial equipment, or embedded systems that only accept bitmap input. Some older image processing pipelines, scientific instruments, and hardware display controllers require uncompressed BMP files. If you do not have a specific compatibility requirement for BMP, PNG is almost always the better choice due to its dramatically smaller file sizes and transparency support.

Frequently Asked Questions

Why is the BMP file so much larger than my PNG?

BMP files store every pixel as raw, uncompressed data. A 1920x1080 image at 24-bit color depth will always be approximately 5.9 MB as a BMP, regardless of the image content. PNG compresses this data intelligently, often achieving files that are 5 to 20 times smaller.

Will my PNG transparency be preserved in BMP?

No. Standard BMP files do not support transparency. Any transparent areas in your PNG will be rendered with a solid background color during conversion. If you need to keep transparency, consider converting to WebP instead.

What software requires BMP files?

BMP is commonly required by older Windows applications, some embedded systems and microcontrollers, certain CNC machines and industrial printers, and legacy game engines. Some scientific imaging software also uses BMP as its default input format.

Is my image uploaded to a server?

No. The conversion happens entirely in your browser using the HTML Canvas API. Your image never leaves your device.