Is this BMP to PNG converter free?

Yes. Every conversion on Convert Always is free, with no account, no watermark and no daily download cap. The site is funded by advertising rather than subscriptions.

Are my BMP files uploaded to a server?

No. BMP to PNG runs entirely inside your browser using WebAssembly, so the file never leaves your device. You can even disconnect from the internet after the page loads.

Can I convert several BMP files at once?

Yes. Add up to 20 files to the queue, convert them in one pass and download the results individually or bundled into a single ZIP archive.

What is the maximum BMP file size?

Files up to 100 MB each are accepted. Browser-side conversions are limited mainly by your device's memory, so very large video files convert faster on a desktop than on a phone.

Does it work on mobile?

Yes. The converter is built mobile-first and works in Safari and Chrome on phones and tablets. Heavy media conversions are slower on mobile hardware but still run locally.

BMP to PNG Converter — Free & Online

What is BMP?

BMP is Microsoft's uncompressed bitmap format. Each pixel is written out literally, which makes it simple and lossless but enormous.

Part of Windows since 1986.

Completely lossless with no compression artefacts
Trivially simple to read, so legacy and embedded software supports it
No decoding cost at load time

What is PNG?

PNG is a lossless raster format built for graphics rather than photographs. Pixels come back out exactly as they went in, and an alpha channel stores per-pixel transparency.

Created in 1996 as a patent-free replacement for GIF.

Perfectly lossless — logos, screenshots and UI mockups stay crisp
Full 8-bit alpha transparency for overlays and layered artwork
Universally supported and safe to re-save as many times as you like

Why convert BMP to PNG?

PNG is the better fit for screenshots, logos, icons and anything that needs transparency or razor-sharp edges, while BMP is built for legacy Windows tooling and intermediate files that will be converted again.
It sidesteps the main drawback of BMP: file sizes are many times larger than any modern format.
You gain perfectly lossless — logos, screenshots and UI mockups stay crisp.
PNG adds a real transparency channel, so cut-outs and overlays stop picking up a background colour.
Compatibility improves where it counts: Every web browser and operating system and All design tools, office suites and presentation software.

Quality and file size after conversion

Both formats are lossless, so nothing is thrown away. The output is a byte-faithful representation of the input; only the container and the compression scheme change, which is why sizes differ while the content does not.

Compatibility

BMP opens in Windows natively; macOS and Linux viewers, Most image editors and older scanning or industrial software. PNG opens in Every web browser and operating system, All design tools, office suites and presentation software, Print workflows that accept RGB artwork.

If the file has to work for someone else, choose the format their software already understands rather than the one with the best specification.

Limitations to know about

Photographs are typically two to five times larger than the JPEG equivalent
No native animation (APNG exists but support is inconsistent)

When to keep BMP instead

BMP is still the right choice for legacy Windows tooling and intermediate files that will be converted again. Keep the original alongside the converted copy whenever you might need to re-export at a different size or quality — conversion is quick, but recovering discarded detail is impossible.

How to convert BMP to PNG

1
Drag your BMP file onto the drop zone above, or click to browse. Up to 20 files can be queued at once.
2
PNG is already selected as the output format — change it in the dropdown if you need something else.
3
Press Convert and watch the per-file progress bar.
4
Download the PNG result, or grab everything as a single ZIP when you converted a batch.

Frequently asked questions

Is this BMP to PNG converter free?: Yes. Every conversion on Convert Always is free, with no account, no watermark and no daily download cap. The site is funded by advertising rather than subscriptions.
Are my BMP files uploaded to a server?: No. BMP to PNG runs entirely inside your browser using WebAssembly, so the file never leaves your device. You can even disconnect from the internet after the page loads.
Will converting to PNG reduce the quality?: Both formats are lossless, so nothing is thrown away. The output is a byte-faithful representation of the input; only the container and the compression scheme change, which is why sizes differ while the content does not.
Can I convert several BMP files at once?: Yes. Add up to 20 files to the queue, convert them in one pass and download the results individually or bundled into a single ZIP archive.
What is the maximum BMP file size?: Files up to 100 MB each are accepted. Browser-side conversions are limited mainly by your device's memory, so very large video files convert faster on a desktop than on a phone.
Does it work on mobile?: Yes. The converter is built mobile-first and works in Safari and Chrome on phones and tablets. Heavy media conversions are slower on mobile hardware but still run locally.

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