Convert uncompressed Bitmaps into next-gen WEBP images locally.
BMP (Bitmap, also called Device Independent Bitmap) is a raster format created by Microsoft for early versions of Windows around 1990. Most BMP files store pixel data with little to no compression, so file sizes scale directly with image dimensions and color depth rather than actual visual complexity. This simplicity made BMP easy for any program to read and write reliably, but it also means a BMP is often 5-10 times larger than an equivalent JPG or PNG. It's still occasionally produced by legacy Windows tools, screenshot utilities, and some scientific or industrial imaging software that prioritize a simple, uncompressed structure.
WebP is a modern image format developed by Google and released in 2010, built on the intra-frame coding of the VP8 video codec. It supports both lossy and lossless compression in the same container, along with alpha transparency and simple animation, covering roughly the combined use cases of JPG, PNG, and GIF in a single format. In practice, WebP files are typically 25-35% smaller than a comparable JPEG or PNG at similar visual quality, which is why it has become a common recommendation for speeding up websites and improving Core Web Vitals scores.
WEBP offers the highest compression ratio for modern web development compared to old BMP formats.
Yes, entirely free with no restrictions.
Yes, this tool is completely free with no registration, no watermark, and no conversion limit.
No, the conversion happens locally in your browser using JavaScript. Your files are never uploaded to any external server.
There's no fixed limit enforced by the tool since everything runs in your browser rather than on a server.
For most everyday uses, the visual difference is negligible.