Convert BMP to PNG

Output is typically about 61% smaller.

Files stay on your device
No upload, no waiting
No sign-up, no watermark

or drag files here · processed on your device

PNG is lossless — the output matches the input pixel for pixel, so there is nothing to configure.

How it works

Add your BMP file
Drag a BMP file onto the drop zone, or click to browse. You can select several at once.
Choose your settings
PNG is lossless, so there is nothing to configure — the output matches the input pixel for pixel.
Download the PNG
Conversion runs on your device as soon as each file is added — no upload, no queue. Download each result when it is ready.

All image tools

Questions

Will I lose anything converting BMP to PNG?

No. Both formats are lossless, so this is a pixel-for-pixel identical copy in a much better container. It is one of the few conversions with no quality question attached at all — the only thing that changes is the file size, downward.

Will converting BMP to PNG make the file smaller?

Usually, yes. A 12-megapixel photo is around 36 MB as BMP and around 14 MB as PNG — about 61% smaller. Because PNG is lossless the result depends entirely on the image content — flat colour and text compress far better than photographic detail.

Does converting BMP to PNG lose quality?

No. PNG is lossless, so every pixel decoded from your BMP file is stored exactly. Both formats are lossless, so the conversion is pixel-for-pixel identical.

Is transparency preserved when converting BMP to PNG?

Yes. Both BMP and PNG support an alpha channel, so transparent and semi-transparent pixels carry across unchanged — a logo with a cut-out background stays cut out, and soft drop shadows keep their gradient rather than picking up a white halo. Because PNG is lossless, the alpha channel is stored exactly as it was.

Why are BMP files so large?

BMP stores pixels essentially uncompressed — three or four bytes per pixel with no encoding at all. A 12-megapixel photo therefore lands around 36 MB, roughly 11× the same image as a JPEG. That simplicity is deliberate: legacy Windows software and embedded devices can read BMP with almost no code.

About bmp to png

Why people convert BMP to PNG

Output from a scanner, an old Windows application or an embedded device. BMP files arrive enormous because they are barely compressed at all.

PNG is the direct replacement and a strictly better one for still images: also lossless, also universally supported, and dramatically smaller. There is no real trade-off to weigh here.

Worth knowing: If the BMP came from a scanner at very high resolution, the PNG will still be a large file. Compression cannot fix having more pixels than you need — resize as well if it is going anywhere near a web page.

BMP and PNG side by side

	BMP	PNG
Full name	Bitmap Image File	Portable Network Graphics
Compression	Lossless	Lossless
Transparency	Yes — alpha channel	Yes — alpha channel
Animation	No	No
Browser support	Supported in all major browsers, though rarely used on the web	Universal — every browser since 1996
Typical 12 MP photo	~36 MB	~14 MB
Usually used for	Legacy Windows applications, scanners and embedded displays	Screenshots, logos, icons, diagrams and anything needing transparency

On a typical 12-megapixel phone photo, the PNG output comes out about 61% smaller than the BMP original. These are order-of-magnitude figures for one kind of image — your own results will vary a great deal, because flat colour, text and line art behave nothing like photographic detail.

What to watch out for

Very large files for photographic content
No animation (APNG is a separate, less-supported extension)
Slower to decode than JPEG at the same pixel count

About the two formats

BMP stores pixels essentially uncompressed, which makes it enormous — a 12-megapixel photo lands around 36 MB, roughly 11× the same image as a JPEG. It persists mainly inside legacy Windows software, scanning utilities and embedded systems where decoding simplicity beats file size.

PNG stores every pixel exactly as it was, with no generation loss no matter how many times you re-save it. That fidelity is why it dominates screenshots, logos and UI assets, and also why it is the wrong choice for photographs — lossless compression simply cannot get a 12-megapixel photo down to a reasonable size.

Other conversions

Everything runs on your device — nothing is uploaded, so there is no size limit, no queue and no copy left on a server afterwards. There is more on how browser-based conversion works if you want the detail. Otherwise, browse every image tool, or convert PNG back to BMP.