BMP Converter
Free online BMP image converter. Convert BMP files to JPG, PNG, WebP, AVIF and more. 100% browser-based, no upload required.
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Your files never leave your device. All conversion happens 100% locally in your browser.
What Is a BMP File?
BMP (Bitmap) is one of the oldest and most fundamental image formats in computing, developed by Microsoft as the native raster graphics format for the Windows operating system. BMP files store pixel data in a simple, uncompressed format using the DIB (Device Independent Bitmap) specification. Because no compression is applied, BMP files are extremely large compared to modern formats, but they retain every single pixel of the original image without any quality loss.
BMP files are still widely used in Windows application development, game asset pipelines, medical imaging, and any workflow where lossless, uncompressed raster data is required. However, their large file size makes them impractical for web publishing, email sharing, or cloud storage. Converting BMP to JPG, PNG, or WebP dramatically reduces file size while maintaining excellent visual quality.
How Our BMP Converter Works
Our BMP converter uses your browser's native image decoding capabilities to process BMP files entirely on your device. When you drop a BMP file, the browser decodes it as a standard raster image, renders it onto an HTML5 canvas, and then re-encodes it to your chosen output format using the canvas API. This approach supports all standard BMP variants:
24-bit BMP (RGB)
The most common BMP variant, storing 24 bits per pixel (8 bits each for red, green, and blue). Fully supported by all browsers and converted with maximum fidelity.
32-bit BMP (RGBA)
32-bit BMP files include an alpha channel for transparency. When converting to PNG, the transparency is preserved. When converting to JPG, the transparent regions are composited onto a white background.
8-bit and 4-bit Indexed BMP
Older BMP files using a color palette of 256 or 16 colors are fully supported. The browser decodes these indexed bitmaps and expands them to full color for output.
BMP vs JPG, PNG, and WebP: Which Format Should You Use?
BMP to JPG
Converting BMP to JPG reduces file size by up to 90% for photographic images. JPG is universally supported and ideal for sharing photos via email, social media, or web. Use JPG when file size matters more than perfect pixel fidelity.
BMP to PNG
PNG is the best replacement for BMP when you need lossless quality. PNG uses lossless compression to reduce file size significantly while preserving every pixel. It also supports transparency, making it ideal for logos, UI assets, and illustrations.
BMP to WebP
WebP is the modern choice for web publishing. It offers up to 30% smaller files than PNG while maintaining excellent quality, and it supports both lossy and lossless compression with transparency. All modern browsers support WebP.
Frequently Asked Questions About BMP Conversion
Are BMP files lossless?
Yes. Standard BMP files store uncompressed pixel data, which means no quality is lost during the save process. This makes BMP a lossless format, similar to TIFF or PNG, but without any compression to reduce file size.
Why are BMP files so large?
BMP files store raw pixel data with no compression. A 1920x1080 24-bit BMP file is approximately 6 MB, while the same image as a PNG would be around 1-2 MB and as a JPG around 300-600 KB. Converting BMP to a compressed format is highly recommended for any use outside of local software workflows.
Is my BMP file uploaded to a server?
No. All BMP conversion happens entirely within your browser using the native canvas API. Your files never leave your device and are never uploaded to any server. Conversion is instant and completely private.
Can I convert multiple BMP files at once?
Yes. Our BMP converter supports batch conversion. Drop multiple BMP files at once and all of them will be converted simultaneously to your chosen output format. Each file can be downloaded individually.