> ## Documentation Index
> Fetch the complete documentation index at: https://docs.letmepost.dev/llms.txt
> Use this file to discover all available pages before exploring further.

# instagram.text.max_graphemes

> Instagram captions cap at 2200 graphemes. Same counter as Bluesky and Threads.

## What it checks

`countGraphemes(text) <= 2200`.

## Why 2200

Meta's Instagram Graph API documents a 2200-character cap on the `caption` field of a media container. The cap is in user-perceived characters; we count graphemes to match.

Empty captions are allowed — see [`instagram.media.required`](/preflight/instagram-media-required), which is the constraint that *does* apply when there's no media.

## Failure response

```json theme={"system"}
{
  "error": {
    "code": "preflight_failed",
    "rule": "instagram.text.max_graphemes",
    "platform": "instagram",
    "message": "Caption is 2400 graphemes; Instagram allows at most 2200."
  }
}
```

## Remediation

Trim the caption. Use grapheme-aware splitting — see [`bluesky.text.max_graphemes`](/preflight/bluesky-text-max_graphemes) for an example.