The first thing you should take into account is that you can post all four types of posts on Twitter: Text, Image, Video, and Link.
Similarly, to posting directly on Twitter, on Postcron your tweets will be limited to a maximum of 280 characters and a maximum of 30 posts per day. You'll be able to attach 4 images per tweet, or one video. Keep in mind that Twitter's integration to third-party Apps (API) limits the video size to 512 mb and duration to 140 seconds, while its dimensions should be between 32x32 and 1280x1024.
You can include URLs to your tweets, and they will always take up exactly 23 characters out of the available 280, no matter how long they are.
Another thing you should take into account is that Twitter's API limits to posting one tweet at a time, so Tweet threads aren't available.
Twitter is very strict when it comes to Spam-like behavior, and it will usually prevent duplicate content from being posted. Itโs recommended that you follow all Twitter policies and best practices when posting either directly on Twitter or via Postcron. You can find the Twitter Rules here.
Sum up
Text Posts: Yes
Max. characters: 280
Hashtag Limit: No
Image Posts: Yes
Multi-Image Posts: Yes
Max. Images per post: 4
Link Posts: Yes
Link Editing: No
Video Posts: Yes
Mentions: Yes