Convert between formats
Convert BMP to WebP
Convert BMP to WebP in your browser. Expect enormous savings — BMP stores images completely uncompressed.
Drop images here
or · drop a folder · paste from clipboard
BMP is the extreme case, and the savings here are the largest of any conversion on this site. A BMP file is essentially uncompressed: it stores three or four bytes for every single pixel with almost no encoding at all. A modest 1920×1080 BMP occupies around 6 MB regardless of whether it depicts a photograph or a plain white rectangle.
Converting to WebP routinely reduces such a file by 95% or more. Nothing about the visible image needs to change to achieve this; the original was simply storing data in the least efficient way available.
BMP files usually turn up from older Windows software, scanners, screen-capture utilities, and certain industrial or medical applications that never updated their export formats. If you are handling them regularly, converting on the way in is worth building into your routine.
Note that BMP has no meaningful transparency support in most files you will encounter, so the output is opaque. Nothing is lost in the conversion — there was no transparency to preserve.
How to convert bmp to webp
- Drop your BMP files onto the box above, or click to browse for them.
- Adjust the quality slider if you want a smaller file or a sharper one.
- Download each WebP image, or grab all of them at once as a ZIP.
Frequently asked questions
Why are BMP files so enormous?
Because they are effectively uncompressed. Every pixel is stored individually at full size, so the file size depends only on the dimensions, never on the content. A blank image costs as much as a detailed photograph.
How much smaller will the WebP be?
Typically 95% or more. This is the largest saving of any common conversion, purely because the starting point is so inefficient.
Will I lose quality?
A small amount, since WebP is lossy at the default setting. Given the scale of the size reduction, the trade is overwhelmingly favourable. Raise the quality slider if the image is going to be edited further.
Where do BMP files even come from?
Usually older Windows applications, scanner software, screen-capture tools, and specialist industrial or medical equipment with dated export options.