Free Image to ICO Converter — Create Favicons Instantly
Convert PNG, JPG, WebP, and SVG images to ICO format instantly — no software needed. Generate multi-size favicon ICO files for websites, desktop apps, and Windows executables from any image. Outputs all standard sizes including 16x16, 32x32, 64x64, and 256x256 in a single ICO file. 100% free, private, and runs entirely in your browser.
Upload Image
Related Image Tools
Image to ICO Converter — Build Browser Favicons From Any Image
ICO files are not ordinary images — they are multi-resolution containers that pack several image sizes into a single file. A properly built favicon.ico typically contains 16×16, 32×32, and 48×48 pixel versions of your icon simultaneously. The browser picks the appropriate size based on context: 16×16 for browser tabs, 32×32 for taskbar pinned sites, 48×48 for desktop shortcuts. A single-size ICO will display but may look blurry in contexts expecting a different resolution.
Windows uses ICO format natively for application icons, desktop shortcuts, and file type associations. If you are building a Windows application or creating a custom folder icon, ICO is the required format. PNG icons work in modern browsers as favicons via the link tag but ICO remains the fallback format that every browser including IE11 understands without a manifest file.
For best results, start with a square PNG at 256×256 or larger with a transparent background. The converter will generate all necessary sub-resolutions automatically. Avoid converting a small 32×32 PNG upward — the pixelation gets encoded into every size variant. Design at large scale, convert down.