Depending on what social media platform you are posting to it may have different requirements for images. Below is a list of each platform and their image requirements.
Blogger
-no restrictions
| Max images | 1 |
Bluesky
| Maximum file size | 1mb |
| Max images | 4 |
Discord
| Maximum file size | 8mb |
| Max images | 4 |
| Maximum file size | 10mb |
| Max images | 25 |
GMB
| Minimum file size | 10kb |
| Maximum file size | 5mb |
| Minimum dimension | 250 |
| Maximum dimension | 3000 |
| Minimum aspect | 1:2 |
| Maximum aspect | 2:1 |
| Max images |
1 |
| Minimum file size | 1024b |
| Maximum file size | 8mb |
| Minimum dimension | 320 |
| Maximum dimension | 1920 |
| Minimum aspect | 4:5 |
| Maximum aspect | 1.91:1 |
| Max images |
10 |
-Images with a largest-dimension of greater than 1080px will be scaled down automatically by Instagram, and images with a shortest-side smaller than 320px will be scaled up.
| Maximum dimension | 36152320 |
| Max images | 1 |
Mastodon
| Maximum file size | 8mb |
| Maximum dimension | 2000 |
| Max images | 4 |
Nextdoor
| Maximum file size | 5mb |
| Maximum dimension | 8192 |
| Max images | 1 |
| Maximum file size | 20mb |
| Minimum dimension | 600 |
| Maximum dimension | 1500 |
| Max images | 1 |
-No restrictions
| Max images | 1 |
Slack
-No restrictions
| Max images | 1 |
Stocktwits
| Maximum file size | 1mb |
| Max images | 1 |
Tiktok
-No images allowed
Tumblr
| Maximum file size | 10mb |
| Minimum dimension | 100 |
| Maximum dimension | 1920 |
| Max images | 4 |
X (Twitter)
| Maximum file size | 5mb |
| Maximum dimension | 8192 |
| Max images | 4 |
Wordpress
-No restrictions
| Max images | 1 |