> ## 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.

# pinterest.cover_image.mime_allowed

> Cover image content-type must be jpeg, png, or webp.

## What it checks

The reachability probe of `pinterest.coverImageUrl` records the response's `Content-Type` header. If it isn't one of the allowlisted image mimes, preflight fails before the video upload runs.

Allowed: `image/jpeg`, `image/png`, `image/webp`.

## Why

Pinterest's pin endpoint expects the cover URL to serve a real image — HEIC, GIF, AVIF, or `application/octet-stream` from a misconfigured CDN all surface upstream as opaque pin failures. Preflight maps that to a clear remediation.

## Failure response

```json theme={"system"}
{
  "error": {
    "code": "preflight_failed",
    "rule": "pinterest.cover_image.mime_allowed",
    "platform": "pinterest",
    "message": "Cover image mime type 'image/heic' is not allowed on Pinterest.",
    "remediation": "Use one of: image/jpeg, image/png, image/webp."
  }
}
```

## Remediation

Re-encode the cover image to JPEG:

```sh theme={"system"}
sips -s format jpeg cover.heic --out cover.jpg
# or
ffmpeg -i cover.heic cover.jpg
```

Then host the JPEG (or PNG / WebP) URL.

## Related

* [`pinterest.cover_image_url.reachable`](/preflight/pinterest-cover_image_url-reachable)
* [`pinterest.video.cover_required`](/preflight/pinterest-video-cover_required)