Wren BMP to PNG

Convert BMP images to PNG and get dramatically smaller files with zero quality loss — no upload, no limits, no signup. BMP (Bitmap) stores raw uncompressed pixels, making files unnecessarily huge. A 5MB BMP typically becomes 500KB-1MB as PNG with identical quality. PNG uses lossless compression, so every pixel is preserved. This tool processes everything in your browser — your files never leave your device.

Why convert BMP to PNG?

BMP files store raw, uncompressed pixel data — making them 5-10x larger than necessary. PNG uses lossless compression to achieve much smaller files with zero quality loss. PNG also supports transparency, which BMP doesn't.

Is there any quality loss?

No. PNG is a lossless format — every single pixel is preserved exactly as it appears in the original BMP. The file is smaller only because PNG compresses the data more efficiently, not by removing information.

How much smaller will the PNG be?

Typically 5-10x smaller. A 10MB BMP photograph might become 1-2MB as PNG. For simple graphics with solid colors, the reduction can be even more dramatic — 20x or more.

Why do some apps still save as BMP?

BMP is a legacy Windows format that some older apps default to. It's also used in some embedded systems and older scanners. There's no modern reason to keep files as BMP — PNG is better in every way (smaller, supports transparency, universally compatible).