Great question — since CODM is a mobile game, you need a screen overlay app that draws your custom crosshair on top of everything. Here's how it works for each platform:

Android (easiest)

1. Export your crosshair from this tool as a transparent PNG using the download button.

2. Install a crosshair overlay app from the Play Store, such as:

   • Custom Crosshair Overlay — lets you import your own PNG image
   • Crosshair Hero — supports custom images with adjustable position/size
3. Import your PNG into the overlay app. It will use Android's "Draw over other apps" permission to keep it pinned on screen above CODM.
4. Launch CODM — the crosshair stays visible on top of the game at all times.

In Android Settings, go to Apps > Special Access > Display over other apps and make sure the overlay app has permission enabled.

iOS (more limited)

iOS doesn't allow third-party screen overlays the same way Android does. Your options:

1. Physical crosshair sticker — small transparent screen stickers with a crosshair dot. Cheap and works on any device with zero latency.
2. Accessibility zoom trick — Go to Settings > Accessibility > Zoom, enable it, set zoom level to minimum, and use the crosshair-shaped zoom controller as a center-screen reference point. Not ideal, but built-in.
3. Monitor/TV overlay — If you're casting to a screen that supports crosshair overlays (some gaming monitors do), you can use that.

Important notes:

• Using a screen overlay does not modify game files, so it's generally considered safe, but always check CODM's current terms of service.
• Make sure to disable the in-game crosshair in CODM settings if your overlay replaces it, to avoid visual clutter.
• Position your exported crosshair at dead center of the screen in the overlay app for accuracy.

The crosshair creator here gives you a transparent PNG at 256x256 — that's the file you import into whichever overlay method you choose.