Batch convert BMP images to WEBP format. 100% browser-based, no uploads, no limits.
Drop images here or click to add files
Accepts BMP files
Files stay on your device. Nothing sent to any server.
Process hundreds of images at once with no limits.
WebP files are 25–35% smaller than JPEG or PNG.
BMP files are Microsoft's raw bitmap format — uncompressed, massive, and ill-suited for anything beyond local Windows applications. Converting BMP to WebP can reduce file sizes by 90% or more while maintaining perfect visual quality, making your images practical to store, share, and publish on the web.
BMP (Bitmap Image File) is one of the oldest image formats, introduced by Microsoft with Windows 1.0 in the mid-1980s. It stores image data as a straightforward grid of pixels with little to no compression. Every pixel is stored with its full color value, resulting in files that are an exact, uncompressed representation of the image on screen.
Because BMP files are uncompressed, they are extremely large compared to modern formats. A simple 1920×1080 screenshot saved as BMP will typically be around 6 MB, while the same image saved as WebP at high quality might be 200–400 KB — a reduction of over 90%. This makes BMP files impractical for web use, email attachments, or any context where file size matters.
BMP is still the native format for some legacy Windows applications and tools, and Windows Paint saves files as BMP by default. However, for any use case beyond those narrow Windows-specific contexts, BMP should be converted to a modern format before storage, sharing, or web publishing.
WebP is Google's modern web image format, designed to deliver the same visual quality as older formats at a fraction of the file size. It uses advanced compression algorithms that analyze image data in large, overlapping blocks — finding redundancies and patterns that simpler formats miss. The result is files that are dramatically smaller than BMP, PNG, or even JPEG.
For images converted from BMP, the size difference is staggering. Since BMP stores every pixel with no compression at all, even a simple image with large areas of solid color will be enormous. WebP compresses these efficiently, often achieving 90–95% smaller file sizes with no visible quality loss at all.
WebP is supported by all modern web browsers and can be displayed on any webpage. It is also supported by most modern image editing applications, making it a practical replacement for BMP in nearly all workflows.
At 85% quality, the visual difference is imperceptible for typical images. Since BMP is uncompressed, the WebP output at high quality settings is essentially a lossless representation of the original content, just stored much more efficiently.
Yes, and you should. BMP has no meaningful browser support for web display, while WebP is supported by all modern browsers. Converting your BMP images to WebP makes them both displayable on the web and dramatically smaller in file size.
There is no limit. imgToWebP supports unlimited batch conversion in your browser. You can drop an entire folder of BMP files onto the converter and they will all be processed simultaneously.
WebP is a modern image format developed by Google that provides superior compression for images on the web. It supports both lossy and lossless compression.
Yes! When you upload an image, it never travels to any server — not ours, not anyone else's. Everything happens inside your own browser using your device's processing power. Think of it like using a calculator: the math happens on the device in your hand, not somewhere in the cloud.
You can convert JPEG, PNG, GIF, BMP, SVG, AVIF, and ICO files to WebP format using our converter.