> ## Documentation Index
> Fetch the complete documentation index at: https://cometchat-22654f5b-docs-angular-v5-docs-update.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# Constraints and Limits

> Review CometChat moderation constraints for supported SDK versions, media formats, rule limits, and known behavior.

This page outlines the system constraints and limitations for CometChat's Moderation Service. Understanding these limits helps you design your moderation strategy effectively.

<Note>
  **Need higher limits?** Contact [CometChat Support](https://www.cometchat.com/contact) to discuss enterprise options for increased limits.
</Note>

<Info>
  For detailed API parameter constraints (Rules, Lists, Advanced Settings), see the [Properties and Constraints](/rest-api/moderation-apis/properties-and-constraints).
</Info>

***

## Supported Formats

| Media Type | Supported Formats |
| ---------- | ----------------- |
| **Images** | JPEG, PNG         |
| **Videos** | MP4, MOV, AVI     |

<Warning>
  Other image and video formats are not currently supported for AI moderation.
</Warning>

***

## Known Limitations

<AccordionGroup>
  <Accordion title="SDK Version Requirement">
    Moderation features require SDK version **3.0 or higher**. Ensure your app is updated before enabling moderation.
  </Accordion>

  <Accordion title="Message Delivery Status Behavior">
    If a message is marked as delivered/read and previous messages include pending or disapproved ones, those will also be automatically marked as delivered/read—even though they weren't actually delivered to the receiver.
  </Accordion>
</AccordionGroup>

***

## Quick Reference

| Limit                            | Value |
| -------------------------------- | ----- |
| **Maximum custom rules per app** | 25    |
| **Maximum custom lists per app** | 25    |
| **Maximum filters per rule**     | 10    |
| **Maximum conditions per rule**  | 10    |

***

## Related Resources

<CardGroup cols={2}>
  <Card title="Rules Management" icon="shield-check" href="/moderation/rules-management">
    Configure moderation rules
  </Card>

  <Card title="Lists Management" icon="list" href="/moderation/lists-management">
    Manage keyword lists
  </Card>

  <Card title="Moderation Overview" icon="eye" href="/moderation/overview">
    Learn about the moderation system
  </Card>

  <Card title="Contact Support" icon="headset" href="https://www.cometchat.com/contact">
    Request higher limits
  </Card>
</CardGroup>