Converting BMP to PNG compresses the image losslessly, typically shrinking the file 2–5× while preserving every pixel exactly. PNG also handles alpha channels reliably where BMP's alpha support is inconsistent.
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Lossless conversion. Pixels transfer exactly. File size drops substantially because PNG uses DEFLATE compression where BMP uses none. Alpha transparency becomes properly supported.
PNG runs on every browser, OS, and image tool ever made.
BMP is the uncompressed Windows bitmap format from 1990. Files are huge because almost nothing is compressed, but the format is trivial to decode and supported by virtually every Windows utility, embedded system, and legacy tool. Useful as an interchange format when other options fail.
PNG is a lossless image format designed to replace GIF. It uses DEFLATE compression, supports an 8-bit alpha channel for full transparency, and preserves every pixel exactly. PNG excels at images with sharp edges, large flat-color regions, text, UI screenshots, and anything you'll re-edit.
Typically 2–5× smaller. For images with flat-color regions (screenshots, UI, logos) the compression is very effective; for noisy photographic content, less so.
Yes, if the BMP had an alpha channel (32-bit BMP). PNG's alpha support is more reliable than BMP's and the transparency transfers cleanly.
BMP is the uncompressed Windows bitmap format from 1990. Files are huge because almost nothing is compressed, but the format is trivial to decode and supported by virtually every Windows utility, embedded system, and legacy tool. Useful as an interchange format when other options fail.
PNG is a lossless image format designed to replace GIF. It uses DEFLATE compression, supports an 8-bit alpha channel for full transparency, and preserves every pixel exactly. PNG excels at images with sharp edges, large flat-color regions, text, UI screenshots, and anything you'll re-edit.
Yes. The converter runs entirely in your browser using WebAssembly. Your images are never uploaded, never sent to a server, and never leave your device.
There's no hard limit, but because everything runs in your browser you're bounded by available memory. Very large images (over a few hundred megapixels) can hit browser memory limits. Process in smaller batches if you run into issues.