Drop files here, or click to browse
Max 10 MB · Single file
How to use
01
Upload a source image
Drop any image up to 10 MB onto the upload zone. A square image works best, because every ICO entry is square and non square sources get stretched to fit each size.
02
Tick the sizes to include
Use the Sizes to include checkboxes to pick from 16x16 through 256x256. The 16, 32, 48, and 64 pixel entries start checked, which covers browser tabs, bookmarks, and Windows shortcuts.
03
Press Build ICO
The button label counts your picks, for example Build ICO (4 sizes). Each size is rendered to PNG, packed into one .ico container, and downloaded under your original filename with an .ico extension.
Why ICO Converter
- Build multi-resolution Windows .ico files from any image.
- Selectable sizes, pick exactly what you need.
- All resolutions packed into a single ICO file.
Common questions
What sizes should my favicon ICO actually contain?
At minimum 16x16 for browser tabs and 32x32 for bookmark bars and high density tab rendering. Adding 48x48 covers Windows desktop shortcuts. Beyond that, 64x64 and up mainly help if the icon appears in large shortcut views, so include them when file size isn't a concern.
Can this ICO converter start from a JPG instead of a PNG?
Yes, any image your browser can display works as the source. Just remember that JPG has no alpha channel, so the icon will have a solid background. Start from a transparent PNG if you want the icon shape to float over the tab background.
How is a multi size .ico different from renaming a PNG?
A real .ico begins with a directory that lists every embedded resolution, letting Windows and browsers pull the best match for the context. A renamed PNG has no directory, so older software either refuses it or scales one bitmap badly. This tool writes the genuine container format.
Why does my ICO look blurry at 16x16?
Detailed artwork simply can't survive a shrink to 256 pixels total. The tool uses high quality smoothing when scaling, but fine lines and small text will always mush together at that size. Simplify the mark, thicken strokes, and check the smallest size before shipping.
Is converting an image to ICO online safe for an unreleased logo?
Here, yes, because the resizing and ICO packing happen on a canvas inside your browser. The logo never transfers to a server, so there's nothing sitting in an upload folder waiting to leak.
Do modern browsers still need an ICO favicon?
Current browsers happily accept PNG favicons declared in a link tag. ICO earns its keep as the fallback: browsers request /favicon.ico automatically when no tag is present, and various older clients and Windows integrations still expect the container. Shipping both is the safe play.
What bit depth does the generated ICO use?
Each entry is written as 32 bit with PNG compressed image data, which preserves the full alpha channel for smooth transparent edges. That's the same approach modern favicons from major sites use.