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Compress BMP
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BMP (Windows Bitmap) stores every pixel as raw, uncompressed bytes — there is literally no compression applied. A 1920×1080 BMP file occupies approximately 6 MB regardless of whether the image is a plain white canvas or a complex photograph. This makes BMP compression one of the easiest wins in image optimisation: converting to any format that applies even basic compression produces a massive reduction. Switching to PNG achieves 5–10× file-size reduction with zero quality loss, because PNG's lossless DEFLATE compression eliminates all the redundancy that BMP wastes. Switching to WebP goes further — typically 15–40× smaller — by applying lossy compression that discards detail the eye barely perceives. The result is a usable, web-compatible image at a fraction of the original size.
When you’d want to compress
- Converting Windows screenshots or system-resource graphics exported as BMP
- Reducing enormous raw pixel exports from graphics tools before sharing or uploading
- Getting a BMP file into a web-compatible format in a single step
- Archiving uncompressed BMP files in a lossless but much smaller format
What to watch for
How to Use
- 1
Drop your BMP files onto the upload area or click to browse.
- 2
Select the output format: WebP for the smallest result, PNG for lossless compression, or JPEG for universal compatibility.
- 3
Set the quality slider if you chose WebP or JPEG. Quality 82–88 is a good default.
- 4
Download the compressed output — expect files 80–95% smaller than the original BMP.
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Frequently Asked Questions
How much smaller will the output be compared to the BMP?
PNG: typically 5–10× smaller (lossless). WebP at quality 85: typically 15–40× smaller. JPEG at quality 80: typically 10–30× smaller. BMP has no compression at all — converting to any of these formats applies compression for the first time, producing dramatic reductions.
Should I convert to PNG or WebP for compressed BMP?
PNG if you need pixel-exact quality — it is lossless and universally compatible. WebP if you need the smallest possible file for web use — it supports transparency and is accepted by all major browsers. JPEG if you need the smallest file and do not need transparency.
Will the quality change when compressing BMP?
Only if you choose a lossy output format (WebP or JPEG). PNG output is lossless — identical to the BMP in image content. WebP and JPEG apply lossy compression, but at quality 80+ the difference from the uncompressed BMP is imperceptible in photographs.
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