Compress BMP images — free, private, no upload
BMP is uncompressed — converting to PNG keeps every pixel identical at a fraction of the size.
About compressing BMP
BMP is the native Windows bitmap format from 1990. Pixels are usually stored uncompressed, so files are enormous — a 12-megapixel photo is ~36 MB as BMP versus ~3 MB as JPEG. It survives in legacy Windows software, scanners and embedded systems. Unless a specific tool demands BMP, converting to PNG (lossless) or JPEG (photos) saves 90%+ with nothing lost in practice.
How to compress BMP
- 1Drop BMP files above — batches are fine, and nothing is uploaded.
- 2Compression is lossless by default. Optionally lower quality below 70 for palette-based lossy savings, or cap the max dimension to downscale.
- 3Watch each file’s size drop, then download individually or as a ZIP.
BMP strengths & limitations
Strengths
- Dead simple, universally readable
- No compression artifacts ever
- Fast to write on old hardware
Limitations
- Massive file sizes (usually uncompressed)
- No real transparency support in practice
- No animation, poor metadata
Frequently asked questions
How does BMP compression work here?+
BMP is uncompressed — converting to PNG keeps every pixel identical at a fraction of the size.
What quality setting should I use for BMP?+
BMP compression here is lossless by default — there is no quality trade-off. The slider only matters if you drop below 70, which enables lossy palette reduction.
Is there a limit on file size or number of images?+
No hard limits: processing runs on your own device, so the only constraint is your browser’s memory for truly gigantic images. Batch as many files as you want.
Will compressing BMP remove metadata?+
Yes. Output files are built from raw pixels, so EXIF data — GPS location, camera model, timestamps — is stripped. Orientation is baked into the pixels first so photos stay upright. This usually saves a few extra kilobytes too.
Are my images uploaded anywhere?+
No. The codecs run as WebAssembly in your browser; the page works offline once loaded. Files, previews and results all live in your device’s memory only.