BMP to PNG Converter

Convert BMP images to PNG entirely in your browser — same lossless quality, far smaller files, batch conversion and ZIP download. Nothing is ever uploaded.

Drop BMP images to convert

or click to choose · drag a whole folder

.bmp accepted

100% in your browser
No upload, no signup
Lossless quality
Much smaller files

Why Convert BMP to PNG?

BMP is one of the oldest image formats on Windows, and it stores pictures almost completely uncompressed. That keeps every pixel intact, but it makes the files enormous — a single screenshot saved as BMP can be five to ten megabytes, many times larger than it needs to be. Converting BMP to PNG keeps exactly the same image while shrinking the file by 50 to 70 percent.

PNG is the better home for the same picture almost everywhere it counts. It is lossless too, so nothing is thrown away, but it compresses the data efficiently and is accepted by every browser, chat app, document editor and website — places where a raw BMP is often rejected or simply too heavy to upload.

This tool does the BMP to PNG conversion in your browser in seconds, with no quality loss and no upload required, whether you have a single bitmap or a whole folder of them.

BMP vs PNG: What's the Difference?

BMP and PNG are both lossless — converting between them never degrades the image. The difference is size and reach: BMP is essentially uncompressed and Windows-centric, while PNG is compressed and works everywhere.

A BMP file writes out pixel data with little or no compression, which is why it is so large. PNG stores the very same pixels but runs them through lossless compression, so the result is identical in quality yet dramatically smaller. Because the conversion is lossless on both ends, a BMP turned into a PNG and back again would be pixel-for-pixel the same.

For editing in legacy Windows software you might keep the BMP. For sharing, uploading, embedding in a document, or publishing on the web, convert BMP to PNG: you get the same image at a fraction of the size, in a format that opens anywhere.

How to Convert BMP to PNG in 3 Steps

There's nothing to install and no account to create. Here's how to convert BMP to PNG from any device with a modern browser.

Add your BMP files

Drag your bitmaps — or a whole folder — onto the box above, or click to browse. Everything stays on your device; nothing is uploaded to a server.

Convert in your browser

Each BMP is decoded and re-encoded as a lossless PNG right on your device. There's no quality setting because nothing is discarded.

Download your PNGs

Save each PNG individually, or grab the whole batch as a single ZIP. The tool shows how many bytes you saved overall.

Pro tip: Need an even smaller file for the web and don't need lossless? Convert the result with our PNG to JPG tool.

Same Pixels, Much Smaller — and Private

Because both formats are lossless, converting BMP to PNG changes the file size, not the picture. The same image comes out 50 to 70 percent smaller, ready to upload or embed where a bulky BMP would be refused. The tool reports the total bytes saved across your batch so you can see the difference.

A note on transparency: PNG supports an alpha channel, but a BMP source is almost always fully opaque, so your PNG will be opaque too unless the original actually carried transparency. Results are shown on a light checkerboard so you can confirm exactly what the output contains.

BMP to PNG is ideal for:

Old Windows screenshots
Scanned bitmaps
Legacy app exports
Web-ready images
Email & chat attachments

BMP to PNG on Windows, Mac & in Bulk

The same browser tool works everywhere. Here's what it handles in each case.

§ 01

On Windows 10 & 11

BMP is a Windows native format, so this is where it piles up — old Paint saves, screenshots and exports. Convert them to PNG straight from File Explorer, no editor needed.

§ 02

On Mac

macOS rarely produces BMP but often receives it from Windows users. Drop those bitmaps here to turn them into PNGs that Preview, Photos and the web all handle cleanly.

§ 03

In bulk

Have a folder full of bitmaps? Add them all at once — there's no server, so there's no batch cap and nothing waits in a queue. Download everything as one ZIP.

Your Images Never Leave Your Device

Most BMP to PNG converters in the top results upload your files to a server, then promise to delete them later. This tool removes the need for that promise: your bitmaps are converted by your own browser's canvas, so nothing is ever transmitted.

Because nothing is uploaded, there's no size cap, no queue and no account to create — and the tool keeps working even if your connection drops after the page loads.

§ 01

On-device only

Conversion happens in your browser. No image is ever sent to us or anyone else.

§ 02

No limits

No file-size cap and no batch limit, because there's no server doing the work.

§ 03

Nothing stored

We can't keep what we never receive. Close the tab and every trace is gone.

Frequently Asked Questions

Is this BMP to PNG converter free?⌄

Yes — completely free with no signup, no watermark and no daily limit. Because the conversion runs in your browser instead of on our servers, there's no per-file cost to pass on to you.

Does converting BMP to PNG lose quality?⌄

No. Both BMP and PNG are lossless formats, so every pixel is preserved exactly. The only thing that changes is the file size, which drops thanks to PNG's lossless compression.

How much smaller will the PNG be?⌄

Usually 50 to 70 percent smaller than the original BMP, since BMP is essentially uncompressed. The exact saving depends on the image; the tool shows the total bytes saved across your batch.

Do my images get uploaded anywhere?⌄

No. Your BMP files are converted entirely on your own device using the browser's canvas. They never touch a server, which is why there are no size or count limits — and why it still works offline after the page loads.

Will the PNG be transparent?⌄

Only if the source had transparency, which BMP files almost never do. PNG supports an alpha channel, but a typical opaque BMP becomes an opaque PNG. Results are shown on a checkerboard so you can see exactly what you get.

Can I convert many BMP files at once?⌄

Yes. Add as many bitmaps as you like — or drag a whole folder — convert them in one pass, and download everything as a single ZIP. There's no batch cap because there's no server.

How do I convert BMP to PNG on Windows?⌄

Just open this page in any browser on Windows, drag your .bmp files in, and download the PNGs. There's no need for Paint or any installed software, and it works the same on Windows 10 and 11.

Should I use PNG or JPG for my converted image?⌄

Choose PNG when you need lossless quality or sharp edges like text and screenshots. If you want the smallest possible file for the web and can accept lossy compression, convert the PNG further with our PNG to JPG tool.

Ready to convert your BMP images?

Drop your bitmaps into the converter — lossless, private, and with no limits.

Back to the converter

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