01
How they differ
| YouTube | ||
|---|---|---|
| Posts | video, photos | video |
| Shapes | 9:16, 4:5, 1:1 | 9:16, 16:9 |
| Text | 2,200 characters | 5,000 characters |
| Title | None | 100 characters |
| Options | Cover frame, collaborators | Title, tags, privacy, playlist |
A 9:16 video works on both without cropping. The text limit differs (2,200 against 5,000), so write a shorter version for Instagram in the same post.
02
In the dashboard
- Connect Instagram and YouTube to the same profile.
- Pick both in the composer, add the video and the caption, and change the text for either one if it needs its own.
- Post now, schedule, queue or repeat it. Each network’s result shows on its own, with one-click retry if one fails.
03
With the API
curl -X POST https://api.reelspan.com/v1/posts/video \
-H "Authorization: Bearer $REELSPAN_KEY" \
-F user=my-brand \
-F "platform[]=instagram" -F "platform[]=youtube" \
-F "[email protected]" \
-F "title=Your caption" \
-F "instagram_title=A shorter caption just for Instagram"More: Instagram, YouTube, API docs, or start free.