Windows icon sizes explained
A Windows ICO can hold many sizes, and the shell chooses one depending on where the icon appears. Getting the size set right - and tuning the small ones - is what separates a crisp icon from a blurry one.
The sizes that matter, and where Windows uses them
| Size | Where it appears |
|---|---|
| 16x16 | Taskbar (small), file lists and details, title bars, notification tray |
| 24x24 | Some menus; high-DPI rendering of 16-pixel spots |
| 32x32 | Desktop (medium), Alt+Tab switcher, dialogs |
| 48x48 | Desktop large icons, Explorer medium thumbnails |
| 64 / 96 / 128 | High-DPI scaling of the sizes above on scaled displays |
| 256x256 | Explorer "extra large" and jumbo thumbnails |
| up to 768x768 | High-resolution frames IconWorkshop can author for Windows 10 and 11 |
Why the small sizes need a careful eye
At 16, 24, and 32 pixels there are too few pixels for automatic downscaling to look good: thin strokes vanish and nearby details merge into a blob. Draw or correct these sizes by hand - that is exactly what Photoshop templates are for, and you can also touch them up in IconWorkshop after generating the family.
A practical size set
For most application icons, 16, 24, 32, 48, and 256 covers the Windows shell. Add the high-DPI sizes (64, 96, 128) when you target large or scaled displays. IconWorkshop builds the whole set from one source, so you are not creating each size by hand. Modern icons use 32-bit color (RGBA with alpha); the legacy 256-color and 16-color frames are rarely needed today.
Common questions
Which sizes should my ICO include?
At a minimum 16, 32, 48, and 256 pixels. Add 24, and the high-DPI sizes 64, 96, and 128, if you ship for large or scaled displays.
What is the biggest Windows icon size?
IconWorkshop authors ICO frames up to 768x768 with an alpha channel, intended for the high-DPI sizes Windows 10 and 11 display.
Why does my icon look blurry at small sizes?
It was almost certainly scaled down from one large image. Bake dedicated 16, 24, and 32 pixel frames into the ICO and hand-tune them so thin strokes and small details survive.
Related guides
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