Codex Pet Generator — Free AI Pet Maker
Turn any photo into a custom Codex pet. Free, fast, no sign-up — create pixel-art cats, dogs, and fantasy pets in minutes, then download your installable spritesheet + pet.json.
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How it works
Four steps from a photo to a coding companion that lives on your desktop.
Upload
Drop any photo — a pet, an avatar, a character. JPG, PNG or WebP.
Approve the base
AI turns it into a pixel character. Approve the look, or regenerate.
Unlock the animated ZIP
9 animation states composed into spritesheet.webp + pet.json.
Install from terminal
Copy to ~/.codex/pets/ and your companion comes to life on screen.
What you get
A Codex-ready package: a transparent spritesheet plus a metadata file.
spritesheet.webp
1536 × 18729 states × 8 frames, transparent background. The exact grid Codex reads.
pet.json
metadataFour fields tell Codex how to name and locate your pet. That is it.
{
"id": "pixel-cat",
"displayName": "Pixel Cat",
"description": "A calm coding companion",
"spritesheetPath": "spritesheet.webp"
}Compatible with OpenAI Codex custom pets.
Simple pricing
Choose the plan that fits your needs. No hidden fees.
Starter
Try it out and see what PetGen can do.
- 1 pet generation
- 9 animation states
- Standard quality spritesheet
- WebP download
- Community support
Pro
For creators who want more control and quality.
- 15 pet generations / month
- 9 animation states
- HD spritesheet (2x)
- WebP + ZIP download
- Priority support
- pet.json customization
Unlimited
For power users and teams.
- Unlimited generations
- 9 animation states
- HD + 4K spritesheet
- All download formats
- Commercial use license
- Dedicated support
- Custom color palette
Featured Pets
Who Is Codex Pet Generator For?
Whether you're sketching your first sprite or shipping a full game, Codex turns a text prompt into a consistent, game-ready pet in minutes.
Hobbyists & Indie Devs
Prototype companion creatures and NPC pets without hiring an artist. Iterate on styles until the look fits your world.
Content Creators
Build a recognizable mascot for streams, shorts, and thumbnails, then keep it consistent across every upload.
Educators & Students
Teach game art and prompt design by letting learners watch a character evolve from idea to sprite in real time.
Pet Lovers
Reimagine your own cat or dog as a fantasy creature, a pixel companion, or a tabletop token to share with friends.
New to sprite art? Our blog covers prompting tips, animation basics, and how to wire Codex into your workflow.
Frequently Asked Questions
What is PetGen?
PetGen is an AI-powered tool that transforms your photos into animated pixel-art pets compatible with OpenAI Codex.
How does the pet generation work?
Upload a photo, and our AI creates a pixel-art base character. You approve the look, then 9 animation states are generated.
What image formats are supported?
We support JPG, PNG, and WebP formats. Maximum file size is 10MB.
How long does generation take?
The base character takes about 90 seconds. The full animation set takes 2–5 minutes.
How do I install the pet into Codex?
Download the ZIP, extract it, and copy the folder to ~/.codex/pets/. Restart Codex and your pet will appear.
Is there a free plan?
Yes. The Starter plan is free and includes 1 pet generation with standard quality.