Captions from what is on screen
Reelspan samples frames from the video (up to 5 minutes) and writes a title or caption for each network you pick.
ReelspanAI captions
It watches the video. It writes the captions.
Upload a clip and get a YouTube title and description, a TikTok caption, an Instagram caption, a LinkedIn post and an X post, each in that network’s voice and within its limits. Facebook, Threads, Bluesky and Pinterest too. Edit anything before it goes out.
From the video itselfThe big networksWithin every limitIn the composer and the API
What you get
Or from a few words
Give it your notes or a link’s text and get a caption per network, with a short summary to reuse.
Fit captions you already have
Paste your own caption; it is shortened, reworded and tagged for each network instead of copied everywhere.
Never over a limit
Every caption is written to the network’s length and format: titles for YouTube, short text for X, hashtags where they belong.
Your AI agent can call it
The same tools are in the API and the MCP server, so an agent can write and post in one go.
One credit per caption set
One call writes the captions for every network at once and uses one AI credit.
How it works
- 1
Upload the video
In the composer, or send it to the API.
- 2
Click Write captions
Captions appear per network in a few seconds.
- 3
Edit and post
Change what you like, then post now or schedule.
In code
Captions from a video, in one call
Send the video and the networks; get back a caption object per network, ready to post or edit.
curl -X POST https://api.reelspan.com/v1/ai/video-captions \
-H "Authorization: Bearer $REELSPAN_KEY" \
-F [email protected] \
-F platforms=youtube,tiktok,linkedin \
-F "context=Launch of our new editor"Let the video write its own captions.