BMP to WebP Converter - Convert BMP to WebP Online Free

How to convert BMP to WEBP

Add your BMP files. Drop up to 50 BMP or DIB images into the box, or browse for them. They never leave your device.
Pick the quality. Drag the slider (85 is a good start) or switch on Lossless for screenshots and logos. The WebP size shown is measured from the real file.
Adjust if you like. Keep or fill transparency, resize for the web, or rename the files.
Convert and download. Press Convert to WEBP. One or two files download directly, more than two come as a ZIP.

Need a format for older software instead? BMP to JPG works everywhere.

Why convert BMP to WebP?

BMP is the heaviest image format you are likely to meet.

WebP is one of the lightest, and every modern browser shows it.

Converting usually cuts the size by 80-95%, so pages load faster and storage lasts longer. Unlike JPG, WebP keeps transparency too.

BMP vs WebP

	BMP	WebP
Compression	None (or simple RLE)	Lossy or lossless
Typical size	Huge - about 3 bytes per pixel	80-95% smaller
Transparency	Only 32-bit	Yes, in lossy and lossless
Max size	Practically unlimited	16383 x 16383 px
Opens in	Windows apps, Paint, editors	All modern browsers, most apps

Need the bitmap back for an old program? WebP to BMP does it. Curious about the newest format? Try BMP to AVIF.

Lossy or lossless?

Lossy (quality 75-90) - for photos. Tiny files, and the difference is hard to spot.
Lossless - for screenshots, diagrams, logos and pixel art. Every pixel is kept, like PNG, but usually smaller.
Not sure? Try both - the size under the settings is measured from the real file each time.

Tips

For a website? The Web preset resizes to 1920 px wide, plenty for full-screen images.
Safari user? Safari can show WebP but cannot write it yet - convert in Chrome, Edge or Firefox.
Need maximum compatibility? BMP to PNG opens in every app ever made.
Still too big? Squeeze it again with Compress WebP.

Frequently Asked Questions

Drop your BMP files into the box, keep quality 85 or switch on Lossless, and press Convert to WEBP.

One file downloads as a WebP, more than two come as a ZIP.

No. Your browser reads the BMP and writes the WebP on your device. Nothing is sent anywhere.

At quality 85 the difference is practically invisible. For no loss at all switch on Lossless - the file is still far smaller than the BMP.

Usually 80-95% smaller for photos, and often 90% or more for screenshots in lossless mode. The exact size is measured from the real WebP before you download.

Yes. The alpha channel of a 32-bit BMP becomes WebP transparency in both lossy and lossless mode. Pick Fill background if you want a solid colour.

Safari can display WebP but has no WebP encoder yet, so it cannot create one in the browser. Chrome, Edge and Firefox all can.

1, 4, 8, 16, 24 and 32-bit BMP and DIB files, uncompressed or RLE4/RLE8 compressed, with bitfields, V4/V5 headers, top-down rows and OS/2 headers.

Up to 50 BMP files per batch, up to 300 MB each. Recent conversions stay in this browser, so you can download them again later.