How to convert BMP to WebP
- Select Choose files, or drop BMP images on the box. You can add many at once.
- Leave the quality at 90 percent, or move the slider down for a smaller file.
- Select Download, or Download all for a ZIP. Names end in
.webp.
Why convert BMP to WebP
BMP files store every pixel uncompressed. A 1920×1080 image at 24 bits is 6,220,800 bytes, about 5.9MB, before headers. WebP stores the same picture in a small fraction of that, so converting saves disk space and makes the image easy to share.
For scale, an uncompressed 24-bit BMP takes width × height × 3 bytes plus a 54 byte header, which gives these sizes:
| Resolution | 24-bit BMP size in bytes | In megabytes |
|---|---|---|
| 1280×720 | 2,764,854 | 2.6 MB |
| 1920×1080 | 6,220,854 | 5.9 MB |
| 3840×2160 | 24,883,254 | 23.7 MB |
What is kept and what changes
The conversion is lossy at the quality you pick (90 percent by default), with an alpha channel kept when the BMP has one. For flat graphics and screenshots the result looks identical at normal viewing size. If you need exact pixels, use BMP to PNG instead.
Quality and file size
The quality slider runs from 50 to 100 percent. Photos and scans can use 80 to 90 percent, and screenshots with thin text look best at 90 percent or higher. The pixel dimensions never change, so a 1920×1080 BMP stays 1920×1080. Many BMP files come from scanners and older software, so you can drop many files and download one ZIP.
When to use it
BMP shows up in old screenshots, scanners, embedded device exports and legacy Windows software. WebP is a good fit when the image goes on a website. When it goes to email or a document, BMP to JPG is the safer format.
Tips
- Screenshots with sharp text look best at 90 percent or higher.
- Photographs can use 80 percent and still look clean.
- Need lossless? Pick BMP to PNG.
Your files stay on your device. Nothing is uploaded, and there is no sign-up.