You can schedule image or video posts to Reddit using Postpone. Below are the supported formats and size limits.
Images
- Supported formats: .jpeg, .jpg, .png, .webp, .heic (Apple format)
- Maximum file size: 40 MB
Reddit accepts images up to 20 MB. Postpone automatically converts larger images, and .heic images, to a Reddit-compatible JPEG.
GIFs
- Supported format: .gif
- Maximum file size: 100 MB
Videos
- Supported formats: .mp4, .mov, .gifv, .webm, .m4v, .3gp, .3g2
- Maximum file size: 5 GB
Reddit's own limits still apply when you post. Reddit accepts videos up to 1 GB, and .mp4 or .mov files work most reliably.