BMP to PNG Converter — Free & Fast Online Tool
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Only BMP files accepted
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About BMP to PNG Conversion
BMP files from old software or scanners are usually stored uncompressed, which means they're both larger than necessary and missing the transparency support modern workflows expect. Converting BMP to PNG shrinks the file with zero quality loss and adds the option of transparency for further editing.
BMP vs PNG: Why Convert?
BMP is one of the oldest raster formats still around, typically storing images uncompressed — every pixel written out in full with no algorithm shrinking the file. That guarantees compatibility with decades-old Windows software but produces unnecessarily large files and offers no transparency support.
PNG uses lossless compression, meaning it shrinks the file size significantly while preserving every pixel exactly, and it adds full alpha transparency support that BMP lacks entirely. It's also far more widely expected by modern design tools, websites, and image editors than BMP.
Converting BMP to PNG is close to a free upgrade: no quality is lost since both formats are lossless, but you get a smaller file and the option to add transparency in an editor afterward — something the original BMP couldn't offer at all.
When to Convert BMP to PNG
- Shrinking old scanned documents or screenshots saved as uncompressed BMP by legacy software
- Preparing a BMP graphic for editing where you plan to add transparent layers or masks
- Uploading to modern platforms that don't recognize or properly handle BMP files
- Archiving old bitmap files in a smaller, universally compatible lossless format
- Meeting technical requirements for tools that specifically expect PNG input
- Shrinking further with lossy compression instead — if losslessness isn't required, our BMP to JPEG converter produces an even smaller file
Conversion happens entirely client-side — your BMP file never leaves your device.
Frequently Asked Questions
No, both BMP and PNG are lossless formats, so no image data is discarded during conversion — the PNG is a pixel-perfect copy of your BMP, just stored more efficiently.
It varies by image, but since BMP is typically stored uncompressed while PNG uses lossless compression, the PNG is often 50-80% smaller with zero quality difference.
No, the converted PNG will have the same solid background as the original BMP (BMP has no transparency to preserve). PNG simply gives you the ability to add transparency afterward in an image editor, which BMP doesn't support.
Yes, this converter supports batch processing — upload several BMP files and download the converted PNGs individually or all together.
Yes, completely free with unlimited conversions, and fully private since everything runs locally in your browser rather than on a server.