Compress BMP Images Online — Free & Ad-Free

Uncompressed Windows bitmap format with very large file sizes. Not suitable for web use without compression. ImageSmith's free BMP compressor reduces file sizes by 60–90% using lossless compression, entirely in your browser. BMP files are completely uncompressed. Converting BMP to JPEG or WebP reduces file size by 90–99% with minimal perceptible quality loss.

Zero quality loss — stores raw, uncompressed pixel data
Simple format, universally readable on Windows
No compression artifacts of any kind

Compress BMP to a Specific Size

Other Format Compressors

When to Use BMP

Avoid BMP for web delivery. Use it only for Windows application assets or intermediate editing files before final export.

BMP Compression FAQ