BMP to WEBP
Take uncompressed bitmaps from the past directly to one of the web's most efficient formats.
BMP to WEBP for websites
If you're migrating an old site or publishing archive material, you may find yourself with a folder full of BMP files. They're far too big to serve as they are. This BMP to WEBP converter takes them all the way from uncompressed bitmaps to one of the most efficient formats on the web, in a single step.
Starting with an uncompressed source is an advantage here. With no earlier compression artifacts to carry over, WEBP can focus on keeping real detail.
How to convert BMP to WEBP
It's quick, with no software to install.
- 1
Upload the bitmap
Drop one .bmp file at a time onto the box, from your computer or phone.
- 2
Pick a WEBP quality
For photos, 75 to 85 works well. Screenshots and diagrams look cleaner at around 90.
- 3
Convert it
Press Convert to WEBP. Because the source is uncompressed, encoding has clean data to work from.
- 4
Publish
Download the WEBP and add it to your site. Most old bitmaps shrink by 95% or more.
Quality suggestions
| Image | Quality | Typical result at 1920 × 1080 |
|---|---|---|
| Photograph | 75–85 | 100–300 KB, down from 6 MB |
| Screenshot with text | 90 | 100–400 KB, with sharp text |
| Simple diagram | 85–90 | Under 100 KB |
Your own figures will vary, so use the result cards to see each file's new size.
Updating an older website
- Find the heavy files. Browser developer tools, or a site crawler, can list images by size. BMPs usually stand out right away.
- Resize where you can. If a picture is displayed smaller than its real size, use Resize Image to match it.
- Convert, upload and relink. Replace the old files, and update your image references. Redirect old image URLs if other sites link to them.
- Test on a phone. That's where lighter pages make the biggest difference.
Other formats for bitmaps
WEBP is meant for websites. For sharing a picture with someone, BMP to JPG produces a format that every device can open. For lossless output, such as a screenshot you'll edit, use BMP to PNG.
Private and free
Nothing leaves your device. There's no account, and no watermark is added. Files can be up to 250 MB.
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Frequently asked questions
Drop the BMP on this page, choose a quality and press Convert to WEBP. Your browser encodes the bitmap and gives you a very small file to download.
Very often 95% smaller or more. A 6 MB bitmap at 1920 × 1080 could become a WEBP of 100 to 300 KB, depending on the picture and your quality setting.
At quality 80 and up, you likely won't see any. WEBP is lossy at these settings, so keep the BMP if you might need an exact copy later.
A single bitmap can be bigger than an entire well-built page, which hurts loading time and can cost visitors money on mobile data. Browsers can display BMP, but there's no good reason to serve one.
All current browsers support it. Some desktop programs and upload forms still don't, and for those, BMP to JPG is a safer option.
Yes, your original isn't changed. The WEBP is a new file, so hold on to the bitmap if you may want a lossless master later.
No. All the processing happens in your browser.
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