Cross-Posting Checker for TikTok, Reels and Shorts
Enter the numbers for one video and see which platforms take it as it is, and what to change for the rest.
Short answer: Yes, if one export meets the strictest limit of each. Keep the video between 3 and 90 seconds, vertical at 9:16 (1080 x 1920 is the recommended size), and under 300 MB. That fits TikTok, Instagram Reels, YouTube Shorts and Facebook Reels through their publishing APIs. Enter your video below to see which platforms accept it as it is and what to change for the rest.
Last verified against each platform’s own documentation; sources are listed below.
What each platform needs from one video
| Check | TikTok | Instagram Reels | YouTube Shorts | Facebook Reels |
|---|---|---|---|---|
| Length (API) | Up to 3 min for every creator | 3 s to 15 min | Up to 3 min to count as a Short | 3 to 90 s |
| Aspect ratio | No ratio rule in the posting docs | 0.01:1 to 10:1; 9:16 recommended | Square or vertical | 9:16 to 16:9; 9:16 recommended |
| Resolution | 360 to 4096 px per side | Up to 1920 px wide | Not stated | At least 540 x 960 px |
| File size | 4 GB | 300 MB | Not stated | Not stated |
Sources
- TikTok for Developers: Content Posting API media transfer guide
- Instagram Platform: IG User Media (Reels specifications)
- Meta for Developers: Reels Publishing API (Facebook)
- YouTube Help: Understand three-minute YouTube Shorts
- YouTube Help: Upload YouTube Shorts (computer)
This reference as plain text: /tools/cross-posting-checker.md
Frequently asked questions
Can I post the same video to TikTok, Reels and Shorts?
Yes, when it is a vertical 9:16 MP4 of 3 to 90 seconds under 300 MB. Each platform publishes its own limits, and this checker compares your numbers with all four.
What aspect ratio works on TikTok, Reels and Shorts?
9:16 (1080 x 1920). Instagram recommends it to avoid cropping or blank space, YouTube counts square or vertical videos as Shorts, and Facebook Reels accepts 9:16 to 16:9. TikTok’s posting documentation sets no ratio rule.
Which platform is the strictest?
Facebook Reels on length (90 seconds through its API) and Instagram on file size (300 MB) and width (1920 px). If you stay inside those, the other limits are met.
Will a long video still work on some of them?
Yes. A 3 min video fits TikTok, Instagram Reels and YouTube Shorts, and only Facebook Reels needs a shorter cut. The checker shows each platform separately.
Does SchedulePost resize or trim the video for each platform?
SchedulePost sends the same file to every channel you select and does not crop, trim or re-encode it, so fix the video first.