BMP to WebP Converter Online
The smallest possible result for a bitmap headed for the web, commonly a 96 to 98% reduction.
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JPG, PNG, WebP, BMP · Multiple files supported
How to Convert BMP to WebP?
Nothing is uploaded. The bmp file is decoded and re-encoded as webp inside this tab.
Add your BMP files
Drag them in or use Choose Files. Batches are fine.
WebP is already selected
90 is ideal. Raise it to 100 if the bitmap contains text or fine line work you need to keep sharp.
Convert and download
Everything runs locally, so the webp file saves straight to your device.
Why Convert BMP to WebP?
Converting BMP to WebP gives you the best possible file size reduction, often 95, 98% smaller than the original BMP, while maintaining excellent visual quality and gaining transparency support. The ideal path from a legacy uncompressed file to a modern web-ready format.
About BMP
BMP is an uncompressed Windows bitmap format producing very large files. BMP is rarely used for web or sharing, but is required by some legacy tools and workflows.
About WebP
WebP is Google's modern web image format. It provides dramatically better compression than BMP, supports transparency, and is accepted by all modern browsers. The best choice for reducing BMP file sizes for web delivery.
What Happens to Transparency
The 24-bit BMP source has no alpha channel, so the WebP is opaque. WebP does support transparency, there is just none in a standard bitmap to preserve.
File Size: What to Expect
The best size reduction of any option for a bitmap. A 5.93 MB 1920x1080 BMP commonly lands between 100 and 250 KB, a reduction of around 96 to 98%, while staying visually indistinguishable at 90% quality.
When Not to Convert BMP to WebP
If the file has to open in legacy desktop software or an older print workflow, WebP may be rejected outright. Convert BMP to PNG or JPG instead when compatibility matters more than size.
How the Conversion Works
The bitmap is decoded and re-encoded with the browser's WebP coder. As with BMP to JPG, this is the first lossy step the image has been through, so quality holds up very well even at moderate settings.
Other BMP and WebP Conversions
Every pairing runs on the same browser-based converter.
Need a pairing that is not listed? The full image converter covers every combination of JPG, PNG, WebP and BMP.
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Frequently Asked Questions
Common questions about converting BMP to WebP online.
Why convert BMP to WebP?
Converting BMP to WebP gives you the best possible file size reduction, often 95, 98% smaller than the original BMP, while maintaining excellent visual quality and gaining transparency support. The ideal path from a legacy uncompressed file to a modern web-ready format.
What happens to transparency when converting BMP to WebP?
The 24-bit BMP source has no alpha channel, so the WebP is opaque. WebP does support transparency, there is just none in a standard bitmap to preserve.
How much will the file size change?
The best size reduction of any option for a bitmap. A 5.93 MB 1920x1080 BMP commonly lands between 100 and 250 KB, a reduction of around 96 to 98%, while staying visually indistinguishable at 90% quality.
When should I not convert BMP to WebP?
If the file has to open in legacy desktop software or an older print workflow, WebP may be rejected outright. Convert BMP to PNG or JPG instead when compatibility matters more than size.
Is WebP the smallest option for a BMP?
Yes, for web delivery. WebP generally beats JPG by 25 to 35% at the same perceived quality, and beats PNG by a wide margin on photographic content.
Where can I use the resulting WebP?
Anywhere on the modern web. Every current browser supports WebP. The main gaps are legacy desktop applications and some older email clients.
Are my BMP images uploaded to a server?
No. The conversion runs entirely in your browser. Your BMP files never leave your device and are never sent anywhere.