PNG stores the same pixels as your BMP, losslessly, in far less space. The conversion runs entirely on your device.
BMP and PNG are both lossless, which makes this the rare conversion with no trade-off at all: the PNG contains exactly the pixels the BMP did, usually at a dramatically smaller size, because PNG actually compresses its data while most BMPs store raw bytes. Screenshots, scanned documents, and graphics exported by older Windows programs all benefit — you keep perfect fidelity and lose the bulk.
The browser’s native bitmap decoder reads each BMP inside a Web Worker, and the PNG encoder writes it back out at the original dimensions. There is no quality setting to worry about because nothing lossy happens at any stage. The whole pipeline runs in your browser tab: no upload, no server queue, no account, and no limit on how many files you convert in a sitting.
Each finished file lists its original and converted size, and batches download together as a ZIP.
Choose PNG when the content is a screenshot, diagram, document scan you may re-edit, or anything with sharp text — lossless compression keeps every edge intact. Choose JPG when the content is a photograph and the priority is the smallest possible file for email or the web. If you are unsure, PNG is the safe default: you can always produce a JPG from it later without going back to the BMP.
Yes. Both formats store exact pixels; PNG just compresses them efficiently. The converted image is pixel-for-pixel identical to the BMP.
It depends on the content, but because most BMPs are uncompressed, reductions of 50–90% are common — screenshots and flat graphics compress especially well.
No. Decoding and encoding happen in your browser using its built-in codecs. Your images stay on your device from drop to download.
Yes — add them all at once, let the queue run, and download everything as a single ZIP when it finishes.