Convert ICO to PNG — Free Online Converter

ICO (Windows Icon) is a multi-resolution container storing multiple icon sizes within a single file, used for Windows application icons and website favicons. PNG (Portable Network Graphics) is a lossless raster format with full alpha transparency that is the modern standard for icon distribution on the web. Converting ICO to PNG extracts the highest-quality image from the ICO container and saves it as a clean, lossless PNG with full transparency support.

ICO-to-PNG is the most popular ICO conversion because PNG is the modern replacement for ICO in web contexts. While browsers still support favicon.ico, the HTML specification recommends PNG favicons via link tags, and most modern browsers prefer PNG over ICO for website icons.

PNG provides everything ICO offers in a more widely supported, standardized format. Every browser, operating system, image editor, and design tool supports PNG natively. Converting ICO to PNG makes icon images accessible in any context, not just the limited scenarios where ICO is understood (Windows shell, browser favicons).

PNG's lossless compression and full 8-bit alpha transparency make it the ideal format for icon images. Unlike JPEG, PNG preserves the crisp edges and transparency essential for icons. Unlike GIF, PNG supports millions of colors and smooth alpha transitions. Converting ICO to PNG gives you the highest-quality standard format representation of the icon.

The ICO container is parsed to identify all embedded image entries. The largest resolution (typically 256x256 for Windows Vista+ icons) is selected. If this entry is stored as embedded PNG data (as per Microsoft's specification for 256x256 icons), it is extracted directly. Smaller entries stored as BMP device-independent bitmaps are decoded to raw RGBA pixels and re-encoded as PNG. The alpha channel is fully preserved, providing smooth transparency around the icon edges. Sharp handles the PNG encoding with DEFLATE lossless compression.