WebP to BMP Converter Online
Expand a WebP into a raw uncompressed bitmap for legacy software, at roughly fifty times the file size.
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JPG, PNG, WebP, BMP · Multiple files supported
How to Convert WebP to BMP?
Nothing is uploaded. The webp file is decoded and re-encoded as bmp inside this tab.
Add your WebP files
Drag them in or use Choose Files. Batches are fine.
BMP is already selected
No quality setting applies. BMP writes every pixel in full, and any transparency is flattened onto white first.
Convert and download
Everything runs locally, so the bmp file saves straight to your device.
Why Convert WebP to BMP?
BMP is required by certain Windows utilities, industrial applications, and legacy software that cannot read modern compressed formats. Converting WebP to BMP produces an uncompressed output that any image-reading software can process.
About WebP
WebP is a modern web format by Google, offering excellent compression and transparency support. While perfect for web delivery, it is not supported by all legacy desktop applications.
About BMP
BMP stores image data uncompressed, every pixel is written in full without any compression algorithm. This makes BMP files large but ensures they can be read by any software capable of processing image data.
What Happens to Transparency
Any alpha channel in the WebP is flattened onto white. The 24-bit BMP format has no way to store transparency.
File Size: What to Expect
The size jump here is the most dramatic of any conversion on this site. A 120 KB WebP at 1920x1080 becomes a 5.93 MB BMP, roughly fifty times larger, because BMP stores every pixel uncompressed.
When Not to Convert WebP to BMP
Only do this when a legacy application specifically requires an uncompressed bitmap. There is no scenario in which BMP is the better choice for storage, sharing or web delivery.
How the Conversion Works
The WebP is decoded, composited onto white, and written as a 24-bit BI_RGB bitmap with bottom-up BGR rows padded to 4-byte boundaries. No compression is applied.
Other WebP and BMP 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 WebP to BMP online.
Why convert WebP to BMP?
BMP is required by certain Windows utilities, industrial applications, and legacy software that cannot read modern compressed formats. Converting WebP to BMP produces an uncompressed output that any image-reading software can process.
What happens to transparency when converting WebP to BMP?
Any alpha channel in the WebP is flattened onto white. The 24-bit BMP format has no way to store transparency.
How much will the file size change?
The size jump here is the most dramatic of any conversion on this site. A 120 KB WebP at 1920x1080 becomes a 5.93 MB BMP, roughly fifty times larger, because BMP stores every pixel uncompressed.
When should I not convert WebP to BMP?
Only do this when a legacy application specifically requires an uncompressed bitmap. There is no scenario in which BMP is the better choice for storage, sharing or web delivery.
Why is the BMP fifty times larger than the WebP?
WebP applies modern compression, BMP applies none. Every pixel takes three raw bytes in a BMP no matter how compressible the image is.
Can BMP store the transparency from my WebP?
Not in the 24-bit format this tool writes, which is the variant legacy software actually expects. Transparent pixels are flattened to white.
Are my WebP images uploaded to a server?
No. The conversion runs entirely in your browser. Your WebP files never leave your device and are never sent anywhere.