How to Convert Multiple BMP Files to PNG at Once
BMP is Windows' old uncompressed bitmap format. Drop your BMP files into the converter below and every one becomes a PNG straight away, right on your any computer or phone – nothing is uploaded.
Drop BMP files here or browse
Accepts HEIC, WebP, PNG, JPG, BMP, GIF and SVG · multiple files · nothing is uploaded
Converted on your device. Your photos never leave your browser.
Step by step: Convert Multiple BMP Files to PNG at Once
- 1
Open this page on your computer or phone.
- 2
Select all your files at once – Ctrl+A (Windows) or ⌘A (Mac) in the file picker, or tap Select on iPhone – or drag a whole selection onto the box.
- 3
The PNG is made as soon as the file is added.
- 4
Each file converts as soon as it's added. Click Download all to get every converted file in one ZIP.
What changes when you convert BMP to PNG
- BMP files are uncompressed, so the PNG will usually be a fraction of the size.
About BMP and PNG
- BMP is Windows' old uncompressed bitmap format. Files are very large for their size in pixels, and most websites, chat apps and phones won't accept them.
- PNG is a lossless format: it keeps every pixel exactly and supports full transparency. That makes it ideal for screenshots, logos and graphics, but photos saved as PNG are often several times bigger than the same photo as a JPG.
Good to know
- There's no limit on the number of files. Large batches just take longer, because your own device does the work.
- Duplicate names get a number added (photo.jpg, photo-2.jpg) so nothing in the ZIP is overwritten.
BMP vs PNG
| BMP | PNG | |
|---|---|---|
| Compression | Usually none | Lossless |
| Transparency | Rarely supported | Yes, full alpha channel |
| Animation | No | No (APNG is rarely supported by editors) |
| Best for | Legacy Windows software | Screenshots, logos, graphics with text or transparency |
| Support | Windows; limited elsewhere | Universal |
Frequently asked questions
Will I lose quality converting BMP to PNG?
No further quality is lost – PNG is lossless. The PNG looks exactly like the BMP you put in.
Can I convert several BMP files at once?
Yes. Add as many as you like; each converts on its own, and Download all saves them in one ZIP.
Are my photos uploaded to a server?
No. The conversion runs in your browser using your device's own processor, so your photos never leave your device. You can even disconnect from the internet once the page has loaded.
Need more options? Open the full Image Converter tool →