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BMP

BMP image

BMP (Bitmap) is an uncompressed raster image format developed by Microsoft, known for its high quality and large file sizes. It's widely supported across various operating systems and image editing software.

What is BMP image?

The BMP file format, also known as Bitmap Image File or Device Independent Bitmap (DIB) file format, is a raster graphics image file format used to store bitmap digital images, independently of the display device. It was developed by Microsoft for its Windows operating system. BMP files can store images in various color depths, typically without compression, or with basic lossless compression like RLE, making them suitable for high-quality, detailed images but resulting in larger file sizes compared to formats like JPEG or PNG.

Advantages

  • High image quality due to uncompressed nature.
  • Widely supported by almost all image viewers and editors.
  • Simple file structure, easy for developers to work with.
  • Supports various color depths.

Limitations

  • Very large file sizes, especially for high-resolution images.
  • Limited or no compression, making it inefficient for web use.
  • Lack of transparency support (though some newer versions can).
  • Not suitable for photographic images due to size.

How to open BMP image files

Microsoft Paint Adobe Photoshop GIMP Windows Photo Viewer / Photos app Apple Preview IrfanView

Common use cases

  • Creating small icons and simple graphics.
  • Storing high-quality, uncompressed images for print.
  • Legacy applications requiring a simple, uncompressed format.
  • Temporary storage of image data during editing workflows.
  • Use in specific software where file size isn't a concern and exact pixel representation is critical.

Explore other formats

Frequently asked questions

Yes, BMP is primarily a lossless format, meaning it preserves all image data without degradation, though some minor compression options exist.
BMP files are large because they typically store image data without compression, or with very minimal lossless compression, storing every pixel individually.
Standard BMP files do not natively support transparency. However, some extended BMP formats (e.g., with an alpha channel) can support it, but this is not universally compatible.
No, BMP is generally not suitable for web images due to its large file sizes, which lead to slow loading times. Formats like WebP, JPEG, or PNG are preferred for the web.
To reduce the size of a BMP file, you typically need to convert it to a compressed format like PNG, JPEG, or WebP using a tool like ConvertX.