Turn a long YouTube video into short clips with an AI agent
A Monmo agent can turn a long YouTube video into short vertical clips. It reads the transcript, picks the moments that stand on their own, cuts each one to 9:16, adds captions and your logo, and writes a title and caption for each platform. The clips are saved to your Library. Posting to Instagram Reels, TikTok and YouTube Shorts waits for your approval.
Updated 2026-11-13 · Free to start. Paid plans from $15 a month.
How the agent does it
- 01
You point it at the video
Share the original file in Google Drive, which keeps the picture sharp, and the YouTube link for the title, chapters and description. If the original is gone, download your copy from YouTube Studio. A 42-minute interview is a typical start.
- 02
It transcribes and reads the whole thing
On its own computer it turns the audio into a transcript with timestamps, then reads all of it. It marks where a point begins and ends, who is speaking and where the picture changes.
- 03
It picks moments that stand alone
It shortlists about six passages of 20 to 45 seconds: a clear claim, a question answered, a story with an ending. Each comes with its timestamps, its opening line and the reason it was chosen.
- 04
It cuts and reframes for a phone
Each passage is cut, long pauses are trimmed, and the frame is cropped to 9:16 at 1080 by 1920 with the speaker kept in view. Your logo and an end card are added.
- 05
It adds captions
Captions are timed from the transcript and burned into the picture, a few words at a time. Names and product terms are checked against the spelling list you give it, because a transcript can mishear them.
- 06
It writes the words around each clip
Every clip gets a title for YouTube Shorts, a caption and hashtags for Reels and TikTok, and a cover frame. The agent checks each clip against the length and size limits of the platform it is for.
- 07
It asks before anything is posted
Watch the clips in your Library first. One card then lists each clip, account and posting time. When you allow it, the agent posts through each platform's connection, or on the platform's site in its own browser if the connection will not take video.
What one video turns into
- About six vertical clips, 1080 by 1920, with captions burned in
- A title, caption and hashtags for each platform, and a cover image per clip
- The timestamps each clip came from, so you can find it in the original
- The finished files in your Library, ready to download or review
- One approval card for posting to Reels, TikTok and Shorts
When it asks you
Transcribing, cutting, captioning and saving the clips to your Library need no approval. Posting does: one card names each clip, the account it goes to and the time, and nothing is uploaded to Instagram, TikTok or YouTube until you allow it.
How to ask
- Last week's 42-minute interview is in Google Drive. Cut six vertical clips of 20 to 45 seconds with captions and our logo. Show me the shortlist of moments before you cut.
- Write a title and caption for each clip for Reels, TikTok and Shorts, then ask me before you post. One a day at 18:00, starting Monday.
- Every Friday at 10:00, check the Drive folder Recordings for new videos and send me the three strongest moments from each as clips to review.
Watch it work
A sample replay with example data, sped up. Pause it, scrub through it, or take the mouse yourself.
On screen
YouTube
Instagram
TikTok
Buffer
Pick a job. Watch it get done.
- Why
- The three clips you asked for, one for each channel.
- Where
- Buffer · Fieldwork on Instagram, TikTok and YouTube
- What to expect
- Queues one clip per channel this week. You can move or remove them in Buffer.
Your team. Connected to everything.
Queue - Buffer+Instagram ReelsHot at the summit · 0:21Tue 18:00ScheduledTikTokFits any pack · 0:18Wed 12:00ScheduledYouTube ShortsCold on the train · 0:24Thu 18:00ScheduledSample replays with fictional data, sped up. Pause one, scrub through it, or take the mouse yourself.
Questions people ask
Can an AI agent turn a YouTube video into short clips?
Yes. A Monmo agent has video tools on its own computer. Give it the video file, and it transcribes the recording, chooses passages that make sense by themselves, cuts them to a vertical 9:16 frame, adds captions and your logo, and saves the finished clips to your Library. You watch them, ask for changes in plain words and decide which ones are posted.
How does it choose which parts of the video to clip?
It works from the transcript. The agent looks for passages that a stranger could follow without the rest of the video: a claim with its reason, a question and its answer, a short story. It sends the shortlist with timestamps and a reason for each, and you can swap any of them or name a moment yourself.
How accurate are the automatic captions?
Check them before you post. Captions come from a transcript of the audio, so names, accents and technical words can come out wrong. Give the agent a list of names and product terms and it compares the captions with it. A correction takes one sentence, such as fix the spelling of Fieldwork in clip three.
Can it post the clips to Instagram Reels, TikTok and YouTube Shorts?
Yes, once you approve. The agent prepares each upload with its title, caption and cover, then shows one card with every clip, account and time. Each platform decides what its connection allows, so an upload may go through the connection or through the platform's website in the agent's own browser. Either way, nothing is posted before you allow it.
Can I use it on videos I did not make?
Use it for video you own or have permission to reuse, such as your own channel, your webinars or footage a client has cleared. The agent does not check who holds the rights to a recording or to the music in it. That decision, and the responsibility for what is posted under your name, remains with you.