How to Batch Convert BMP to WebP (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 WebP 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 WebP (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 WebP is ready the moment the file is added. Lower the Quality if you'd like a lighter file.
- 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 WebP
- WebP is a lossy format. The Quality slider begins at 90%, which is indistinguishable from the original for almost any photo; slide it down for a smaller file and the preview shows the new size before you save.
- Make sure the place you're uploading to takes WebP – most sites and browsers do, though some older apps and forms don't.
- Because BMP is uncompressed, the WebP usually ends up a small fraction of the size.
BMP vs WebP 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.
- WebP is an image format Google designed to make websites load faster. It handles lossy and lossless compression, transparency and animation, and typically comes out 25–35% smaller than a matching JPG, although some editors, older programs and upload forms still won't take it.
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 WebP
| BMP | WebP | |
|---|---|---|
| Compression | Normally none | Lossy or lossless |
| Transparency | Seldom supported | Yes |
| Animation | No | Yes |
| Ideal for | Old Windows programs | Quick-loading pictures on web pages |
| Works on | Windows; patchy elsewhere | Every modern browser; uneven in older desktop software |
Questions & answers
Does changing BMP to WebP lower the quality?
At the 90% default you won't be able to tell. WebP is lossy, so very low settings can bring blur or blocky edges.
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 →