Convert BMP to PNG

Free, unlimited BMP to PNG conversion that runs inside your browser. Your files never leave your device. Every conversion runs locally in your browser.

No upload · No sign-up · No file limit

Choose BMP files or drop them here

Processed on your device · never uploaded · no limit

This converter needs JavaScript, because the conversion runs on your device rather than on a server.

This conversion keeps every pixel exactly as it is while dramatically reducing the file size, because PNG compresses losslessly and BMP barely compresses at all. It is the right choice for screenshots, scanned documents, and diagrams from legacy Windows software, where you want the size down but cannot accept any quality loss at all.

How to convert BMP to PNG

Select your BMP files. Click "Choose BMP files" or drag them onto the box above. You can select as many as you like at once.
Wait for the conversion. Each file is converted to PNG on your own device. Nothing is uploaded, so it finishes as fast as your hardware allows.
Download the results. Download files individually, or take them all at once as a single ZIP archive.

BMP vs PNG

	BMP	PNG
Full name	Bitmap Image File	Portable Network Graphics
Introduced	1986	1996
Compression	Uncompressed	Lossless
Transparency	No	Yes
Animation	No	No
Extensions	.bmp, .dib	.png

About BMP files

BMP is a Microsoft format that stores pixels essentially raw, with little or no compression. The result is perfect fidelity and files that are frequently ten to fifty times larger than an equivalent JPG — a modest photograph can easily exceed 20 MB. It persists mainly in legacy Windows software, scanning utilities, and industrial equipment that never moved on.

Where they come from: Legacy Windows applications, scanners, and industrial software.

Drawbacks of BMP

Enormous file sizes
No transparency in the common variants
Effectively obsolete for web or sharing use

Why convert to PNG?

PNG was created in 1996 as a patent-free replacement for GIF, and it became the standard for anything that needs a transparent background or pixel-perfect fidelity. Its compression is lossless, so a PNG is an exact reproduction of the original — no artefacts, no generational loss when re-saved. That precision is why it is the format of choice for logos, screenshots, icons, and UI assets.

Full alpha transparency
Lossless — no quality degradation, ever
Sharp text, lines, and flat colour stay crisp

Support: Universal, including transparency.

Common questions

Are my files uploaded to a server?

No. The conversion runs entirely inside your browser using your own device’s processor. Your BMP file is never transmitted, never stored, and never seen by us — you can disconnect from the internet after the page loads and it will still work.

Is there a file size or daily limit?

There is no daily limit and no account required. Because your device does the work rather than our server, we have no per-conversion cost to recover. The practical ceiling is your device's available memory — very large files on older phones may fail, in which case convert them in smaller batches.

Can I convert several BMP files at once?

Yes. Select or drop as many BMP files as you like and they are converted one after another, then offered as individual downloads or a single ZIP.