ICO (Windows Icon) is the standard image format for desktop icons, favicons, and application shortcuts on Windows. A single ICO file can contain multiple image sizes (16x16, 32x32, 48x48, 256x256) embedded together, allowing Windows to select the appropriate resolution for each display context — taskbar, desktop, file explorer, and high-DPI screens. Converting JPG to ICO takes your photograph or graphic and produces a multi-resolution icon file ready for use in Windows applications, websites, and software projects.

Favicons — the small icons displayed in browser tabs and bookmark lists — are the most common use case. While modern browsers accept PNG and SVG favicons, the ICO format remains the most universally supported option, working in Internet Explorer, Edge, Chrome, Firefox, Safari, and every other browser. A properly generated ICO favicon ensures your website displays its icon consistently across all platforms and browser versions.

Websites need favicons, and ICO is the only format guaranteed to work in every browser including legacy Internet Explorer versions. While you can use PNG favicons with a `<link>` tag, the classic `/favicon.ico` file at the site root is the fallback that browsers check automatically. Converting a JPG logo or image to ICO with multiple embedded sizes ensures your favicon looks sharp at every resolution.

Windows desktop applications, installers, and shortcuts require ICO format for their icons. If you are developing software, creating a desktop shortcut, or customizing folder icons on Windows, ICO is the only accepted format. The multi-size embedding means a single ICO file serves the 16x16 taskbar icon, the 32x32 desktop icon, and the 256x256 high-DPI icon without separate files.

The converter resizes the source JPG to multiple standard icon sizes (16x16, 32x32, 48x48) and embeds them all within a single ICO container. For sizes up to 48x48, the image data is stored as BMP within the ICO. The resizing uses Lanczos3 resampling for the sharpest possible downscaling results. The source JPG should ideally be square — non-square images are center-cropped to a 1:1 aspect ratio before resizing.

The converter embeds 16x16, 32x32, and 48x48 pixel versions in a single ICO file. These cover the standard Windows taskbar, desktop icon, and file explorer sizes.

Yes. Place the ICO file as favicon.ico in your website root directory, and browsers will automatically display it in tabs, bookmarks, and history.

Ideally yes. Non-square JPGs are center-cropped to a 1:1 aspect ratio before resizing to icon dimensions. Start with a square image for best control over the result.

Icons are displayed at 16x16 to 48x48 pixels. Photographs with complex detail become unrecognizable at these tiny sizes. Icons work best with simple shapes, bold lines, and high contrast.

macOS uses ICNS format for application icons, not ICO. ICO files can be displayed on Mac via web browsers for favicons, but for native Mac apps you need ICNS.

Place the file as /favicon.ico at your website root. Browsers check this path automatically. Optionally add <link rel='icon' href='/favicon.ico'> in your HTML head.

Device	JPG	ICO
Windows PC	Native	Native
macOS	Native	Partial
iPhone/iPad	Native	Partial
Android	Native	Partial
Linux	Partial	Partial
Web Browser	Native	No

Funktion	JPG	ICO
Fullstandigt namn	JPEG Image	Windows Icon
Filandelse	.jpg	.ico
Bast for	Universal support	Windows icons

Convert JPG to ICO — Free Online Converter

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