Converting PNG to ICO produces Windows icon files with proper alpha channel support. PNG is the ideal source for icons because its transparency and sharp edges translate cleanly into the multi-resolution ICO container.
Drag & drop image files here, or browse
Drop your PNG files here
The converter generates standard icon sizes (16, 32, 48, 256) from the source PNG. Details that were sharp at the source resolution may soften at very small sizes; 16×16 icons often benefit from manually designed versions rather than downscales from a 512×512 source.
ICO is handled by every browser (for favicons), every Windows version, and most icon-aware tooling. For modern web use, you can also reference the PNG directly via favicon metadata, but ICO remains the broadest-reach choice.
PNG is a lossless image format designed to replace GIF. It uses DEFLATE compression, supports an 8-bit alpha channel for full transparency, and preserves every pixel exactly. PNG excels at images with sharp edges, large flat-color regions, text, UI screenshots, and anything you'll re-edit.
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.
256×256 or larger, as a square image. The converter generates smaller sizes by downscaling. Starting from a small source and scaling up produces blurry icons.
Yes. ICO supports an alpha channel, and PNG is the ideal transparent source. Transparent PNG regions map cleanly to transparent icon regions.
PNG is a lossless image format designed to replace GIF. It uses DEFLATE compression, supports an 8-bit alpha channel for full transparency, and preserves every pixel exactly. PNG excels at images with sharp edges, large flat-color regions, text, UI screenshots, and anything you'll re-edit.
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.
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.