Convert BMP to PNG — Free, Fast & Private
BMP (Bitmap) files store images without compression, resulting in massive file sizes. A simple 1920x1080 screenshot can weigh 6MB as BMP. Converting to PNG applies lossless compression that typically shrinks the file by 50-80% without losing a single pixel of quality.
PNG also adds transparency support that BMP lacks. If you are working with logos, icons, or UI elements that need transparent backgrounds, converting from BMP to PNG is the correct move. The resulting file is smaller, more portable, and supported everywhere.
MiniPx runs the conversion entirely in your browser using the Canvas API. Your BMP files never leave your device — no upload, no server processing, no waiting. This is particularly useful for legacy BMP files from older scanners, medical imaging software, or Windows screenshot tools.
Why BMP files are so large
BMP stores every pixel as raw color data with zero compression. A 24-bit 1920x1080 BMP needs exactly 1920 x 1080 x 3 bytes = 6.2MB, regardless of image content. PNG uses DEFLATE compression to represent repeated patterns efficiently, which is why the same image as PNG might be 1-2MB.
When to choose PNG vs JPG for BMP conversion
Choose PNG when your BMP contains text, diagrams, screenshots, or graphics with sharp edges — PNG handles these perfectly with lossless compression. Choose BMP to JPG when you are converting photographs and want the smallest possible file size, accepting some quality loss.
Batch conversion
Drop multiple BMP files at once and convert them all to PNG in a single batch — five files at a time on the free tier, uncapped on Pro, and up to 200 MB per file. Download individually or grab all converted files as a ZIP. For more format options, see our PNG converter hub.