BMP to PNG Converter

BMP is an old Windows bitmap format that stores pixel data with little or no compression — simple, but large.

BMP dates back to the earliest versions of Microsoft Windows, where it was used as the native format for storing raw pixel grids with minimal processing overhead — appropriate for the modest CPUs of the era, but wasteful by modern standards. Because it stores pixels close to as-is, a BMP file opens instantly and never introduces compression artifacts, but it can be five to ten times larger than a JPEG of the same image. Today it mostly survives in legacy Windows software and a few specialized pipelines that specifically want uncompressed pixel data.

PNG is a lossless image format built for sharp edges, flat colors, and transparency — think logos, screenshots, and UI graphics rather than photos.

PNG (Portable Network Graphics) was created in the mid-1990s as a free, patent-unencumbered replacement for GIF, and it inherited GIF's lossless approach while adding full 24-bit color and an alpha transparency channel. Because nothing is thrown away during compression, a PNG can be re-saved indefinitely without ever degrading — a real advantage for screenshots, diagrams, and anything with text or hard edges, where JPEG's compression tends to introduce visible smudging. The cost is file size: for photographic content, a PNG is typically several times larger than an equivalent JPEG, which is why most photo libraries still default to JPEG and reserve PNG for graphics.