Convert BMP to PNG
Windows BMP files to modern PNG with compression and transparency, free, in your browser.
.webp, .png, .jpg · up to 50 MB
Why use it
BMP to PNG: from legacy to modern format
Full compatibility
PNG works in all browsers, programs, and platforms. BMP cannot be displayed on the web without conversion.
100% private
Your BMP file converts in your browser. Never uploaded to any server.
Lossless compression
PNG reduces file size by up to 80% compared to BMP without losing a single pixel of information.
Instant
Conversion happens on your device in under 1 second, no waiting.
How it works
Three steps, no hassle
Upload your BMP file
Drag or select your .bmp file. Up to 50 MB, no signup required.
Instant conversion
Your BMP converts to PNG in your browser. PNG's lossless compression significantly reduces file size.
Download your PNG
Get a modern PNG compatible with any platform and smaller than the original BMP.
FAQ
Got questions?
PNG is the right choice when you need lossless compression: screenshots, images with text, logos, and line graphics look perfect in PNG without artifacts. PNG also supports transparency, which BMP doesn't. JPG is better for photos where the small quality loss is acceptable.
The reduction depends on the content. For screenshots with solid color areas and text, PNG can reduce size by 60-80% compared to BMP. For photographic images, the reduction is smaller because there is less redundancy to compress.
BMP supports multiple depths: 1-bit (monochrome), 4-bit, 8-bit (color palette), 16-bit, 24-bit, and 32-bit. PNG supports all these modes. Conversion preserves the original color depth when compatible.
BMP has few current use cases. The Windows clipboard uses BMP internally when copying images (though it's rarely saved to disk). Some Windows development and diagnostic tools prefer BMP for its simplicity. For any other use, PNG or JPG are superior.
If you frequently work with screenshots, configure Windows to save directly to PNG (the Snipping Tool saves in PNG by default). For existing BMP screenshots, this converter transforms them to PNG in seconds. PNG in screenshots drastically reduces size without losing text sharpness.
BMP to PNG: migrating from legacy Windows format to the modern standard
BMP (Bitmap) is Windows's native image format since version 1.0 (1985). Its design is deliberately simple: it stores pixels without compression (or with very basic RLE compression), making it easy to read and write by low-level software. Historically, BMP was important because it guaranteed compatibility in the Windows ecosystem without needing additional codecs.
BMP's limitations are significant: it doesn't support transparency (alpha channel), it has no efficient compression (very large files), and web browsers don't natively support it for display on pages. PNG overcomes all these limitations: efficient lossless compression (Deflate), full alpha channel support, and universal browser compatibility since 1996. For any BMP image that needs to be used on the web, in shared documents, or in design, PNG is the natural successor.
Convertir.ai converts BMP to PNG directly in your browser. Since BMP has no significant compression, input files can be large — conversion to PNG compresses them efficiently. The entire process happens locally on your device.