Images
- Supported formats: .jpeg, .jpg, .png, .webp, .heic/.heif (Apple format)
- Maximum image blocks per post: 10
Postpone automatically reduces oversized images to ensure successful uploads.
GIFs
- Supported format: .gif
- GIFs can be added as image blocks in your Tumblr post.
Videos
- Supported formats: .mp4, .mov (QuickTime)
- Maximum duration: 10 minutes
- Maximum uploaded video blocks per post: 1
You can include video blocks that link to external video URLs (e.g., YouTube) in addition to a single uploaded video.