Add PNG images (or JPG, WebP and other formats, up to 30 files of 50 MB each) and get one .ico file per image containing the sizes you tick: 16, 24, 32, 48, 64, 128 and 256 pixels, with 16, 32, 48 and 256 selected by default. Transparency is kept, a non-square image is padded or cropped to a square, and the conversion runs in your browser.
Convert PNG images to ICO format
ICO is the icon format Windows uses for application, folder and shortcut icons, and the classic format for website favicons. This PNG to ICO converter packs several sizes of your image into one ICO file, ready to use as a favicon or desktop icon.
What is ICO and when do you need it?
An ICO file can hold several sizes of the same icon, typically 16, 32, 48 and 256 pixels, and the browser or operating system picks the one that fits. You need one for a website favicon.ico, a Windows application icon, custom folder icons or desktop shortcuts. Modern browsers also accept PNG favicons, but ICO is still the most widely supported.
Favicon use
Most people convert PNG to ICO for a website favicon. Browsers look for /favicon.ico by default, and an ICO with several sizes looks sharp from the 16 pixel browser tab to a 256 pixel desktop shortcut. For a full set with Apple and Android icons, a manifest and the HTML tags, use the icon generator.
Best practices
Start with a square PNG of at least 256 × 256 pixels. PNG works well as the source because it supports transparency, and the ICO keeps it. Simple, bold designs read best at small sizes, while photos and fine detail don't. Each size inside the ICO is stored as a compressed PNG image, which keeps the file small.
Private processing
Your images are converted in your browser and never uploaded.
Frequently Asked Questions
What sizes should my ICO file contain?
For a favicon, at least 16, 32 and 48 pixels. Adding 256 pixels gives a sharp icon on high-resolution screens and in Windows. These four sizes are selected by default, and you can add 24, 64 and 128.
Do I still need ICO for favicons or can I use PNG?
Current browsers accept PNG favicons, but a favicon.ico still gives the widest compatibility, including older browsers, bookmarks and Windows shortcuts. Many sites provide both.
Will my PNG transparency be preserved in the ICO?
Yes. Every size in the ICO keeps the alpha channel, so transparent areas stay transparent.
Why does my icon look blurry at small sizes?
A 16 × 16 icon has very few pixels, so details from a large design get lost when it's scaled down. Use simple, bold shapes and avoid thin lines and small text.