Guides

How to get one short video onto TikTok, Instagram Reels and YouTube Shorts without redoing the work three times.

How to Post One Video to TikTok, Instagram and YouTube at the Same Time

Export one vertical video, check each platform’s limits, write one caption you adjust per platform, then publish to all three at once with a cross-posting app or by hand.

TikTok vs Instagram Reels vs YouTube Shorts: Video Size, Length and Caption Limits (2026)

One 1080×1920 (9:16) MP4 under 3 minutes works on all three. The platforms differ on maximum length, file size, frame rate and caption limits.