Is PNG smaller than BMP?

Almost always, and often dramatically. PNG compresses losslessly while BMP stores raw, uncompressed pixels, so a PNG is typically 50–80% smaller for the same image.

Do you lose quality converting BMP to PNG?

No. Both formats are lossless, so the converted PNG is pixel-for-pixel identical to the BMP — just much smaller.

Can browsers display BMP?

Not reliably. BMP was never a web format. PNG is supported everywhere online, so converting a BMP to PNG is the way to use it on a website.

Why are BMP files so big?

BMP is essentially uncompressed: it stores every pixel at full size with little or no space-saving, so even a modest image can run to many megabytes.

PNG vs BMP: Compressed vs Uncompressed

What's the core difference between PNG and BMP?

Compression. A BMP writes raw pixel data with little or no compression, so a single photo can run to tens of megabytes. PNG applies lossless DEFLATE compression to exactly the same pixels, typically cutting the file by 50–80% with no change to the image at all. That one difference drives almost everything else.

PNG vs BMP at a glance

Feature	PNG	BMP
Compression	Lossless	None (raw)
File size	Small	Very large
Quality	Lossless	Lossless
Transparency	Full alpha	Rare / limited
Web support	Universal	None
Best for	Almost everything	Raw pixel access (niche)

Same quality, far smaller

Because both formats are lossless, a BMP and a PNG of the same image look identical, pixel for pixel. There is no quality advantage to BMP — the only practical difference is that PNG packs that identical data into a much smaller file. Converting a BMP to PNG is effectively free: you keep every pixel and shed most of the size.

Transparency and the web

BMP has no dependable transparency and web browsers don't display it, so it never had a place online. PNG has a full alpha channel and is supported everywhere on the web — which is exactly why the web settled on PNG (and JPG) rather than BMP. If you need an image on a page, BMP isn't an option; PNG is the default.

Does BMP have any advantage at all?

Only niche ones. The format is dead-simple and the pixels are uncompressed, which can be marginally convenient for low-level, embedded, or legacy software that wants raw image data without running a decoder. For everyday use — web, sharing, editing, storage — that advantage is irrelevant, and PNG is the better pick every time.

How do you convert between PNG and BMP?

The common move is to shrink a bulky BMP: convert BMP to PNG for an identical but far smaller, web-ready file. To squeeze an existing PNG further, the PNG compressor reduces it more without leaving the format.

Frequently asked questions

Is PNG smaller than BMP?: Almost always, and often dramatically. PNG compresses losslessly while BMP stores raw, uncompressed pixels, so a PNG is typically 50–80% smaller for the same image.
Do you lose quality converting BMP to PNG?: No. Both formats are lossless, so the converted PNG is pixel-for-pixel identical to the BMP — just much smaller.
Can browsers display BMP?: Not reliably. BMP was never a web format. PNG is supported everywhere online, so converting a BMP to PNG is the way to use it on a website.
Why are BMP files so big?: BMP is essentially uncompressed: it stores every pixel at full size with little or no space-saving, so even a modest image can run to many megabytes.