Different operating systems have different standard icon sizes. Here's a summary, clicking an operating system you'll scroll down the page to the detailed information with explanations about when to use each of the icon sizes.

Windows 16x16, 24x24, 32x32, 48x48, 256x256
Mac OS X 16x16, 32x32, 64x64, 128x128, 256x256, 512x512, 1024x1024
Linux 16x16, 24x24, 48x48, and 96x96
iOS 6 29x29, 50x50, 57x57, 58x58, 72x72, 100x100, 114x114, 144x144, 1024x1024
iOS 7 29x29, 40x40, 58x58, 60x60, 76x76, 80x80, 120x120, 152x152, 1024x1024
Android 36x36, 48x48, 72x72, 96x96, 512x512
Windows Phone 62x62, 99x99, 173x173, 200x200
 

Icon sizes for Windows Vista, Windows 7 and Windows 8

Application Icons and Control Panel Items

The icons should be in .ico file format.
The full set should includes following icon sizes:

  • 16x16
  • 32x32
  • 48x48
  • 256x256

Icons for Windows 8 (Metro Design)

  • Application icons 30х30, 50x50, 150x150
  • App Bar icons 26х26
By the way, we make the largest free icon pack of Windows 8 icons. Either download all icons in a single ZIP file or search icons by tags and download only selected ones. Alternatively, you could search our Windows 8 icons on IconArchive, a great site for free icons.


Toolbar Icons

Required sizes: 16x16, 24x24, 32x32.
Note that toolbar icons are always flat, not 3D, even at the 32x32 size.


Dialogs and wizards

Required sizes: 32x32 and 48x48


 

Icon sizes for Mac OS X

Application Icons

To ensure that your app icon looks great in all the places that users see it, you need to provide resources in the sizes listed below:

  • 1024x1024
  • 512x512
  • 256x256
  • 128x128
  • 64x64
  • 32x32
  • 16x16

Toolbars

Create icons for standard- and high-resolution displays. You need to supply two resources:

  • 32x32
  • 32x32@2x (64x64)

Use the PNG format.


Sidebars

Create your icons in three sizes:

  • 16x16
  • 18x18
  • 32x32 pixels (if using PDF)
If you create your sidebar icons in PDF format (recommended), OS X will automatically scale your icon for high-resolution display. You do not need to provide high-resolution versions. However, if you use PNG format for your icons, you will need to supply the following resources:
  • 16x16
  • 16x16@2x
  • 18x18
  • 18x18@2x
  • 32x32
  • 32x32@2x

 

Icon sizes for Linux

Here are the icon sizes from the GNOME specification.

GNOME uses a soft, three-dimensional look. This style is achieved by using antialiasing, shading and highlighting techniques.

Bold denotes the primary size for this kind of icon.

Object and document  
24x24, 48x48, and 96x96  
Application
24x24, 48x48  
Toolbar 24x24, 48x48  
Menu 16x16
 

 

iOS 6

iPhone and iPod Touch

Description Standard Resolution High Resolution (Retina Display)
Home Screen Icon 57x57 114x114
Settings Icon 29x29 58x58
Spotlight Icon 29x29 58x58
App icon for the App Stores 1024x1024 1024x1024

iPad

Description Standard Resolution High Resolution (Retina Display)
Home Screen Icon 72x72 144x144
Settings Icon 29x29 58x58
Spotlight Icon 100x100 50x50
App icon for the App Stores 512x512 1024x1024


 

iOS 7

iPhone and iPod Touch

Description Icon Size
Home Screen Icon 120x120
Settings Icon 58x58
Spotlight Icon 80x80
App icon for the App Stores 1024x1024

iPad

Description Standard Resolution High Resolution (Retina Display)
Home Screen Icon 76x76 152x152
Settings Icon 29x29 58x58
Spotlight Icon 80x80 40x40
App icon for the App Stores 512x512 1024x1024


 

Android

Launcher Icons

Google Play 512x512
Extra High dpi (xhdpi) 96x96
High dpi (hdpi) 72x72
Medium dpi (mdpi) 48x48
Low dpi (ldpi) 36x36

Action Bar Icons

Double Extra High dpi (xhdpi) 96x96
Extra High dpi (xhdpi) 64x64
High dpi (hdpi) 48x48
Medium dpi (mdpi) 36x36

By the way, Icons8 is preparing the icon pack for Android. We are going to release first 200 icons free, plus vectors, and leave only PNG files free after a while. Subscribe to get notified.

 

Windows Phone

Application Iconography

Required Icons in the XAP Package Size
Application Icon 62x62
Application Tile Image 173x173

Windows Phone Marketplace Iconography

Icon Size
Device application icon for Windows Phone Marketplace catalog (small) 99x99
Device application icon for Windows Phone Marketplace catalog (large) 173x173
Desktop application icon for Windows Phone Marketplace catalog 200x200