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

# Create Image Upload URL

> Create a signed upload URL for an image asset.

**Limits:** 50 MB

## Request

```bash theme={null}
curl -X POST "https://api.mosaic.so/uploads/image/get_upload_url" \
  -H "Authorization: Bearer mk_your_api_key"
```

## Response

```json theme={null}
{
  "image_id": "img-1234-5678-90ab-cdef",
  "upload_url": "https://storage.googleapis.com/...",
  "upload_fields": {
    "key": "...",
    "policy": "...",
    "x-goog-signature": "..."
  },
  "max_file_size_bytes": 52428800
}
```

Use `image_id` in `update_params` after [finalizing the upload](/api/asset-management/post-uploads-image-finalize-upload).