BMP vs PNG: Image Format Differences Explained

BMP (Bitmap) is one of the oldest image formats, dating back to early Windows. While PNG has largely replaced it, BMP still appears in certain workflows. Here's how they compare.

BMP: Uncompressed Simplicity

BMP stores pixel data with minimal or no compression. This results in very large files but extremely simple decoding. A 1920x1080 image in BMP takes about 6MB, compared to around 1-2MB as PNG.

PNG: Smart Compression

PNG uses lossless compression (DEFLATE algorithm) to achieve significantly smaller files with zero quality loss. It also supports alpha transparency, gamma correction, and color profiles that BMP lacks.

Why PNG Replaced BMP

• PNG files are 3-5x smaller with identical quality
• PNG supports transparency; BMP doesn't (in practice)
• PNG is a web standard; browsers don't consistently handle BMP
• PNG includes error detection (CRC checksums)

Where BMP Still Exists

BMP persists in legacy Windows applications, embedded systems with simple graphics requirements, certain scientific imaging tools, and as an intermediate format in some image processing pipelines.

Convert BMP to PNG

If you have BMP files, there's almost never a reason to keep them in that format. Convert BMP to PNG for smaller files with the same quality, or convert BMP to JPG for even smaller sizes with photos.