Convert BMP to WebP

Drop images here

or click to choose - JPG, PNG, WebP, GIF or BMP. Batch supported.

Your images are processed on your own device and never uploaded to a server.

How to convert BMP to WebP

  1. Drop your BMP file into the box above, or click it to browse your device. You can add several files at once.
  2. Leave the output format on WebP, or switch it if you changed your mind. Quality is set high by default; lower it only if you need a smaller file.
  3. Download the new WebP file. Each result shows the original size, the new size and the percentage saved.

BMP and WebP are not interchangeable - they were designed to solve different problems. BMP stores raw, uncompressed pixel data. Nothing is lost, but nothing is optimised either. WebP was built by Google for the web. At matching visual quality it usually produces files 25-34% smaller than JPEG, and it still supports transparency. Converting from BMP to WebP makes sense when you want smaller files for a faster website without a quality drop you can see.

BMP has no transparency to begin with, so the conversion leaves the image fully opaque - switching to WebP does not add an alpha channel that was never there. And because WebP is a lossy format, PixSquash lets you trade a little quality for a much smaller file.

Everything here runs locally. Your BMP file is decoded by your own browser and re-encoded by it too - nothing is ever uploaded to a server, which is what makes the tool both fast and private.

BMP vs WebP at a glance

BMPWebP
CompressionLosslessLossy
TransparencyNot supportedSupported
Best foralmost nothing on the web - it is a legacy format from the Windows 3.x eraany image that appears on a website, where a smaller file means a faster page and a better Core Web Vitals score
Main drawbackfiles are enormous, often 10 to 50 times larger than the same image saved as WebPvery old software and a few desktop editors still cannot open it

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Frequently asked questions

Does converting BMP to WebP reduce quality?
A little, by design. WebP is a lossy format, so some detail is discarded permanently. At PixSquash's default quality setting the difference is normally invisible, and the file becomes dramatically smaller. If you need a mathematically exact copy, convert to PNG instead.
Will transparency be preserved in the WebP file?
Yes. WebP supports an alpha channel, so whatever transparency existed in the original BMP is carried through the conversion.
Can I convert several BMP files at once?
Yes. Drop as many BMP files as you like onto the box above; PixSquash converts them all in the browser and gives you a separate download for each one.
Are my BMP files uploaded anywhere?
No. There is no upload step at all. The conversion happens on your own device using the Canvas API, so your images never leave your computer - which also means it works with sensitive or confidential files.