BMP to PNG converter

Convert BMP to PNG in your browser. Same pixels, typically a fraction of the size — BMP stores images with no compression at all.

Runs on your deviceFree, unlimited

Drop files here

Accepts .bmp · Up to 20 files at a time · up to 80 MB each "Upload" and "download" here mean your browser reading a file from this device and writing one back to it. Nothing is sent to a server — open your browser's network panel and watch: no request carries your file.

Image quality

FAQ

Is any quality lost?

None. PNG is lossless, so the pixels are identical to the BMP. Only the file size changes.

How much smaller will it be?

Typically 60% to over 90% smaller. BMP applies essentially no compression, so almost any real compression is a large win.

Why does BMP still exist?

Because it is trivial to write and read, which suits older Windows software, scientific instruments and embedded systems that value simplicity over size.

Is transparency preserved?

Most BMP files have no transparency to preserve. Where a 32-bit BMP carries an alpha channel, PNG can hold it.

Is there any reason to keep the BMP?

Only if a specific tool demands it. For every other purpose PNG holds the same image in a fraction of the space.

Is it really free?

Yes — every conversion on this site, with no account, no watermark and no daily cap. The work happens on your own device, so there is no server bill for us to pass on to you.

Do I need to install anything?

No. It runs in any modern browser, on Windows, macOS, Linux, Android and iOS. There is nothing to download and nothing to sign up for, and once the page has loaded it keeps working with the network switched off.

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