Converting PNG to BMP stores the image as uncompressed raw pixels in Windows' native bitmap format. The PNG's lossless pixel data transfers exactly, but without compression the file grows to match its uncompressed size, roughly 4 bytes per pixel.
Drag & drop image files here, or browse
Drop your PNG files here
No quality change in either direction. BMP's alpha channel support exists but is inconsistent across tools; some Windows versions treat 32-bit BMPs as having alpha, others don't. For reliable transparency, stick with PNG.
BMP is supported by every Windows version, most image viewers on every platform, and a vast array of legacy tools. Browsers technically support it but rarely encounter it on the web.
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.
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.
Partially and inconsistently. 32-bit BMP can carry an alpha channel, but many tools ignore it. If transparency matters, PNG is the reliable choice.
PNG compresses lossless image data with DEFLATE. BMP stores the raw pixels with no compression. The file grows to 4 bytes × width × height.
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.
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.
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.