How to Batch Convert BMP to PNG (Many Files at Once)
BMP is an old, uncompressed Windows bitmap format. Add your BMP files to the box below and each one turns into a PNG instantly, on your own computer or phone, without anything being 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.
The steps: Batch Convert BMP to PNG (Many Files at Once)
- 1
Open this page on your computer or phone.
- 2
Select every file in one go – Ctrl+A (Windows) or ⌘A (Mac) in the file picker, or Select on iPhone – or drag the whole lot onto the box.
- 3
Your PNG is ready the moment the file is added.
- 4
Each file is converted the moment it's added. Click Download all to get everything in a single ZIP.
What happens to your image going from BMP to PNG
- Because BMP is uncompressed, the PNG usually ends up a small fraction of the size.
BMP vs PNG in brief
- BMP is an old, uncompressed Windows bitmap format. The files are huge for the number of pixels they hold, and most websites, phones and messaging apps won't accept them.
- PNG is lossless, meaning every pixel is stored exactly, and it supports full transparency. That suits screenshots, logos and graphics perfectly, but a photo saved as PNG is often several times larger than the same shot as a JPG.
Worth knowing
- You can add as many files as you like. Bigger batches simply take a bit longer, since your own device is doing the work.
- Files with the same name get a number added (photo.jpg, photo-2.jpg), so nothing in the ZIP gets overwritten.
BMP vs PNG
| BMP | PNG | |
|---|---|---|
| Compression | Normally none | Lossless |
| Transparency | Seldom supported | Yes, with a full alpha channel |
| Animation | No | No (editors rarely support APNG) |
| Ideal for | Old Windows programs | Screenshots, logos and graphics with text or see-through areas |
| Works on | Windows; patchy elsewhere | Everywhere |
Questions & answers
Does changing BMP to PNG lower the quality?
No more quality is lost, because PNG is lossless. Your PNG matches the BMP exactly.
Can I do a whole batch of BMP files?
Yes. Add as many as you want; each is converted separately, and Download all bundles them into a single ZIP.
Do my photos get sent anywhere?
No. Your browser does the conversion with your device's own processor, so your photos stay with you. Once the page has loaded you could even switch off your internet connection.
Need more options? Open the full Image Converter tool →