Compress BMP Online

Reduce BMP file size for email, web publishing and storage. BMP files are uncompressed and very large. LessMB converts and compresses them locally in your browser.

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Files stay on your device

JPG · PNG · WebP · GIF · AVIF · SVG

No upload required100% free foreverWorks in your browser
How it works

Compress BMP Online for private browser workflows

Massive size reduction

BMP files store uncompressed pixel data, making them 10-20x larger than equivalent JPEG. Converting to modern formats saves significant space.

Choose the right output

Use JPEG for photos, WebP for modern web delivery, or PNG for lossless quality with transparency.

Local browser processing

Your BMP file is processed entirely in your browser. No server upload is needed.

Common use cases

Convert old BMP files from Windows applications to compressed modern formats.

Legacy files

Make BMP images web-ready by converting to JPEG or WebP.

Web publishing

Reduce BMP file sizes to fit email attachment limits.

Email sharing

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FAQ

Compress BMP Online FAQ

Answers for the most common questions about this tool, supported workflows, and local browser processing.

No uploadFree toolBrowser-based
Can I compress BMP files for free?

Yes. LessMB processes BMP files for free in your browser without requiring an account.

How much smaller will the file be?

Converting BMP to JPEG typically reduces file size by 90-95% because BMP stores uncompressed data.

Are files uploaded?

No. Processing runs locally in your browser session.