Convert PNG to BMP online for free.
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BMP is Microsoft's legacy uncompressed bitmap format. Almost no modern software output-defaults to BMP. Real reasons to convert: legacy Windows-based industrial or scientific software that can't open PNG, embedded systems reading raw pixel arrays, or specific print-shop equipment that only accepts BMP. Everyone else should pick PNG (lossless, transparent, smaller) instead.
PNG uses lossless DEFLATE compression while BMP stores raw uncompressed pixels. The conversion decompresses the PNG data and writes each pixel value directly into the BMP file. The result is a bit-for-bit identical pixel representation in a much larger file — typically 3-5× the PNG size. Alpha transparency in the PNG is converted to 32-bit BGRA BMP format, though many legacy BMP consumers ignore the alpha channel.
Convert PNG to BMP only when a system requires uncompressed BMP input — legacy embedded systems, certain CNC machines, old Windows software, or hardware displays with BMP-only firmware. In all other cases, PNG is the better choice.
Technical comparison of the two formats — useful for deciding which to use, or for confirming what changes during conversion.
| Property | PNG | BMP |
|---|---|---|
| Full name | Portable Network Graphics | Bitmap |
| Year introduced | 1996 | 1990 |
| Developer / standard body | PNG Development Group / W3C | Microsoft |
| MIME type | image/png | image/bmp |
| File extension | .png | .bmp |
| Compression | Lossless (DEFLATE) | Uncompressed (typically) |
| Color / data depth | 24-bit truecolor + 8-bit alpha | 1 to 32-bit |
| Max dimensions / size | 2,147,483,647 × 2,147,483,647 px | 32,767 × 32,767 px |
| Transparency | Yes | Yes |
| Animation | APNG extension only | No |
| Standard / specification | W3C / ISO/IEC 15948 | Microsoft Windows |
| Best for | Logos, screenshots, graphics with transparency or sharp edges | Legacy Windows applications, raw pixel data |
PNG (Portable Network Graphics) is a lossless image format created in 1996 as a patent-free replacement for GIF. It uses DEFLATE lossless compression, meaning every pixel is preserved exactly as intended — no visual information is discarded during encoding. PNG was developed by the web community and standardized by the W3C and ISO, making it one of the most trusted and universally supported image formats available.
PNG is best suited for screenshots, graphics, logos, and any image that requires transparency. Its support for a full alpha channel allows smooth, semi-transparent edges that blend seamlessly with any background. The main trade-off is file size — PNG files are significantly larger than JPEG for photographic content because no visual data is discarded. PNG does not natively support animation; for animated sequences, APNG (Animated Portable Network Graphics) serves as its extension.
Quick answers about compatibility, quality, metadata handling, and the most common reasons to convert PNG files to BMP.
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