Free BMP Compressor Online

Compress BMP bitmap images for massive file size reduction. Free, instant, browser-based.

Drop BMP file here or click to browse

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How to Compress BMP Files Online

Upload your BMP file and the compressor will re-encode it with compression. BMP files store raw uncompressed pixel data, making them extremely large. Compression typically achieves 90%+ size reduction.

Why Compress BMP?

BMP files are uncompressed bitmaps that can be enormously large. If you receive BMPs from screenshots, scanners, or legacy applications, compressing them makes them practical to share, email, or upload.

Frequently Asked Questions

Why are BMP files so large? BMP stores every pixel without any compression. A 1920×1080 image at 24-bit color is about 6MB as BMP vs ~200KB as compressed JPEG.

What format does the compressed output use? The output is a compressed JPEG or PNG (depending on whether the source has transparency), which all applications can open.