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title: Turn your cat into a Codex pet: the actual end-to-end workflow
canonical_url: https://codexpetgenerator.com/blog/turn-your-cat-into-a-codex-pet
I kept seeing people post little pixel pets sitting in their OpenAI Codex window and figured I'd try it with my own cat. Turns out the whole thing is a photo-to-sprite pipeline, and it takes longer to read this than to do it.
A cat codex pet is just a pixel-art sprite of your cat that Codex renders as a desktop overlay. It idles, walks when you switch windows, and reacts when you poke it. The generator builds the sprite from one photo, so what you get is recognizably your cat, not a stock animal.
Why pixel art and not a live photo? Because a small sprite is cheap to animate and stays clear at the tiny size Codex uses. A photo would just be a blurry thumbnail. The pixel grid hides imperfections and keeps the file small, which is exactly what you want from something parked on your desktop all day.
What you need:
- One clear, well-lit photo of your cat, head and shoulders, plain background
- OpenAI Codex desktop app installed
- About five minutes
The photo matters more than you'd think. A blurry or busy shot makes the generator guess the outline, and the result looks like any cat. Sharp edges and a plain wall behind the cat give it the cleanest silhouette to work from.
Steps:
- Go to codexpetgenerator.com and upload the photo.
- The generator finds the subject and sketches a base sprite.
- Approve it. The tool then builds the animation states.
- Download the package. You get spritesheet.webp and pet.json.
- Drop the folder into Codex's pets directory and restart.
Install on macOS:
mkdir -p ~/.codex/pets && cp -r ~/Downloads/my-cat-pet ~/.codex/pets/
On Windows (PowerShell):
Copy-Item -Recurse "$env:USERPROFILE\Downloads\my-cat-pet" "$env:USERPROFILE\.codex\pets\"
Restart Codex fully. If the pet doesn't show, the folder name almost always doesn't match pet.json, so check that first.
Common failures are one-line fixes: a blank square means the spritesheet is missing (re-download), and a macOS permission error just needs sudo before cp.
The fun part is the motion. A lazy cat ships with more sitting and sleeping loops; a kitten gets more running. It's a tiny touch, but it makes the pet read as yours. The starter plan covers your first pet at no cost, so there's no reason not to point a camera at your cat and see what comes out.
Full walkthrough with every step and the troubleshooting table is here: https://codexpetgenerator.com/blog/turn-your-cat-into-a-codex-pet
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