---
title: Cartridge files
description: Understand the portable `.tynt` file format and validation rules.
---

# Cartridge files

Export creates a readable `.tynt` JSON file with non-empty `title`, `author`, `description`, `controls`, and `source`, plus exact format, canvas, and palette metadata.

The editor accepts incomplete local drafts while you work. Export and publication require complete details. Import rejects missing, blank, oversized, or unknown version 1 fields before replacing the active draft.

The format always uses a 160 × 144 canvas and four indexed colors. This strict boundary keeps public cartridges portable and reviewable.

<Callout title="Portable by design">
  A cartridge contains its metadata and TypeScript source. It does not contain network dependencies or privileged browser access.
</Callout>