ICO Converter
Convert images to ICO icon files with selectable output sizes for favicons and app icons.
Convert JPG, PNG, WebP, AVIF, BMP, or GIF images to ICO icon files at standard sizes (16, 24, 32, 48, 64, 72, 80, 96, 128, 256 px). Ideal for website favicons, Windows desktop application icons, and browser tab icons. The tool preserves transparency from PNG/WebP inputs and centers the image with letterboxing to maintain aspect ratio. All conversion runs entirely in your browser inside a Web Worker, so your images never leave your device.
ICO Converter
Convert images to ICO icon files with selectable output sizes for favicons and app icons.
About this tool
Convert JPG, PNG, WebP, AVIF, BMP, or GIF images to ICO icon files at standard sizes (16, 24, 32, 48, 64, 72, 80, 96, 128, 256 px). Ideal for website favicons, Windows desktop application icons, and browser tab icons. The tool preserves transparency from PNG/WebP inputs and centers the image with letterboxing to maintain aspect ratio. All conversion runs entirely in your browser inside a Web Worker, so your images never leave your device.
FAQ
Common questions and answers about this topic.
Are my images uploaded to a server?
No. All conversion runs entirely in your browser inside a Web Worker. Your images never leave your device.
Which icon size should I choose?
For website favicons, 32×32 px is the standard browser-tab size, while 48×48 or 64×64 also covers bookmarks and shortcuts. For Windows desktop applications, include at least 256×256 (Vista+ taskbar), 48×48, and 16×16. The exported ICO file uses lossless PNG-encoded subimages so it scales cleanly.
Will transparency be preserved?
Yes. ICO files generated by this tool use 32-bit PNG-encoded subimages, fully preserving the alpha channel from PNG, WebP, or AVIF inputs. JPG inputs (which lack transparency) will produce an opaque icon — consider trimming the background first if you need transparency.