Converting ICO to GIF reduces the largest icon image to a 256-color palette. Rarely useful; icons typically have more than 256 colors and depend on smooth alpha, both of which GIF handles poorly.
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Drop your ICO files here
Palette quantization can introduce banding on icons with gradients. Alpha collapses to single-bit transparency, making soft edges jagged. Large icons (256×256) suffer the most; tiny icons often survive palette reduction.
GIF plays on every platform ever made.
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.
GIF is a 1987 format limited to a 256-color palette. Its lasting relevance is support for simple animation, which kept it in the meme ecosystem after PNG replaced it for static images. GIF compression is lossless within its palette constraints but usually worse than PNG for the same image.
Very rarely. Only when a platform strictly requires GIF. For anything practical, PNG or WebP are better targets.
The largest size in the ICO, typically 256×256.
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.
GIF is a 1987 format limited to a 256-color palette. Its lasting relevance is support for simple animation, which kept it in the meme ecosystem after PNG replaced it for static images. GIF compression is lossless within its palette constraints but usually worse than PNG for the same image.
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.