Local by design
Your sprite atlas never leaves the browser.
CUSTOM PET WORKBENCH
Turn a sprite atlas into a real Codex companion.
Validate the official atlas contract, preview every state, edit metadata, and export an install-ready local pet package.
v1 1536×1872
v2 1536×2288
20 MiB max
PNG/WebP
Nebby
Original concept · not an atlas
START WITH A PERSONALITY
An original anime character shelf
These are identity presets for planning. A preset only becomes installable after a real animated atlas passes validation.
PRIVATE LOCAL CHARACTER PACKS
Bring your own characters
Import licensed or personal character packs on this device. Files are stored in this browser only and are never added to the public repository.
⌁
Choose a completed pet folderThe folder must contain pet.json and its referenced PNG/WebP spritesheet.
No local character packs yet.
VALIDATE · PREVIEW · PACKAGE
Pet studio
1 Atlas
2 Identity
3 Export
01
Sprite atlas
Drop a transparent PNG or WebP here.
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File typePNG / WebP
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Atlas size1536×1872 / 1536×2288
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File weight≤ 20 MiB
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TransparencyTransparent background required
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Unused cellsMust remain fully transparent
02
Animation preview
Waiting for a valid atlas
Frame
— / —
03
Pet identity
Metadata saved in pet.json.
pet.json
04
Export package
No upload: processing stays in your browser.
📁 nebby
├─ pet.json
└─ spritesheet.webp
Add a valid atlas to unlock export.
Install on Windows
After export, run this from the repository root:
.\scripts\install-pet.ps1 -SourceDir "C:\path\to\nebby"
Real contract checks
Dimensions, alpha, empty slots, metadata, and v2 format are checked.
Open and bilingual
MIT-licensed, English-first, with complete Simplified Chinese UI and docs.