Converting ICO to WebP produces a compact, transparent image file from the largest icon. WebP cuts file size 25–40% versus PNG while preserving alpha perfectly, which is useful for web-delivered icon content.
Drag & drop image files here, or browse
Drop your ICO files here
Lossless WebP preserves exact pixels. Lossy WebP at high quality is indistinguishable. Alpha transfers cleanly in both modes. Only the largest embedded icon size converts.
WebP works in all modern browsers, every current OS, and most design tools.
ICO is the Windows icon format. A single .ico file can hold multiple resolutions (16×16, 32×32, 48×48, 256×256) and color depths simultaneously, letting the OS pick the best for context. Every browser serves favicons as ICO, and Windows desktop icons use it natively.
WebP is Google's 2010 image format based on the VP8 video codec. It offers lossy and lossless modes, full alpha transparency, and animation in a single container. At matched quality it's typically 25–35% smaller than JPG or PNG. Every major browser has supported it since 2020.
The largest size in the ICO, typically 256×256.
Lossless for icons. They usually have sharp edges and flat colors that lossy compression handles poorly. Quality benefits are worth the slight size increase.
ICO is the Windows icon format. A single .ico file can hold multiple resolutions (16×16, 32×32, 48×48, 256×256) and color depths simultaneously, letting the OS pick the best for context. Every browser serves favicons as ICO, and Windows desktop icons use it natively.
WebP is Google's 2010 image format based on the VP8 video codec. It offers lossy and lossless modes, full alpha transparency, and animation in a single container. At matched quality it's typically 25–35% smaller than JPG or PNG. Every major browser has supported it since 2020.
Yes. The converter runs entirely in your browser using WebAssembly. Your images are never uploaded, never sent to a server, and never leave your device.
There's no hard limit, but because everything runs in your browser you're bounded by available memory. Very large images (over a few hundred megapixels) can hit browser memory limits. Process in smaller batches if you run into issues.