Convert BMP to PNG
Uncompressed bitmaps, losslessly shrunk — same image, sane size, made on your device.
Drop your image here
or
JPG, PNG, WebP, HEIC, SVG — any size, no upload
🔒 Files never leave your device — everything runs in your browser.
BMP is an honest but wasteful format: every pixel stored raw, no compression at all — the reason a simple screenshot can weigh several megabytes. PNG stores the identical pixels losslessly compressed, routinely cutting the file to a fraction of its size with zero change to the image.
BMPs come from old Windows tools, MS Paint, scanners, and industrial software; PNG is their modern equivalent that email, web, and every current app accept happily. The conversion is exact and runs entirely in your browser — scans and screenshots never upload anywhere.
How it works
- Drop your file
Any common format, any size. Nothing is uploaded — the tool runs in your browser.
- Choose quality or size
Pick a quality preset, set an exact KB target, or switch the output format — tuned for bmp to png.
- Download
Your converted file is ready on your device — nothing to wait for, nothing to delete from a server.
Frequently asked questions
Is BMP to PNG really lossless?
Completely — PNG's compression is lossless by design, so the PNG contains pixel-for-pixel the same image as the BMP. Nothing is approximated; only the storage gets smarter.
How much smaller will the PNG be?
Often 50–90% smaller, best for screenshots, documents, and graphics with uniform areas. Noisy photographic scans compress less, but shrink meaningfully all the same.
Should I pick JPG instead for scanned photos?
If the scan is photographic and size matters most, JPG gets smaller still at slight quality cost. For documents, diagrams, and anything you may edit again, PNG's losslessness is the safer keep.
Is my file uploaded to a server?
No. ConvertUno runs entirely in your browser on your own device. Your file never leaves your computer or phone — there is no upload at all.
Is it really free, with no watermark?
Yes. Processing happens on your device, so serving you costs us almost nothing — no watermark, no account, no file-size limit, no daily quota.