Turn a long video into Shorts, Reels and TikToks

Quick answer

Upload the long video to MirrorCut, such as a YouTube video, webinar, livestream, interview or lesson, and ask for Shorts. Its AI agent scores the strongest moments by how well they hook, cuts each into a vertical clip that follows the speaker, and adds animated captions. Each Short opens as its own timeline, so you can trim it or swap the hook before you export.

A long video usually holds several moments that work on their own as a Short: a clear answer, a strong opinion, a story with a point. Finding them means watching the whole thing again, then cutting, reframing to 9:16 and captioning each one by hand.

MirrorCut's agent does that first pass. It reads the whole video, ranks the moments by how well they hook, and cuts each into a vertical clip with captions. You review every Short on a real timeline and keep what works.

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7 days free, then $10 a month. Works in your browser.

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MirrorCut editor showing a finished 9:16 Short with a '9/10 dentists recommended this' stat graphic above the speaker, caption and graphics tracks on the timeline, the 16:9 / 9:16 / 1:1 / 4:5 format switcher, and the agent's checklist: cut to the beat at 92 BPM, sound effects placed, music trimmed.
A finished 9:16 Short: stat graphic, word-timed captions, cuts on the music's beat, and one click to switch format.

Just ask for it

Things you can type to MirrorCut's agent:

  • “Find the five strongest moments and cut each into a Short”
  • “Make a 30-second Short from the best answer in this webinar”
  • “Cut a teaser for this video that opens on the strongest line”
  • “Reframe each Short to 9:16 and add bold word-by-word captions”

How it works

  1. 1

    Upload the long video

    MP4, MOV, MKV or WebM: a YouTube video, webinar, livestream recording, interview or lesson. Large files upload in the background.

  2. 2

    Ask for Shorts

    Say how many, how long, and the caption style. The agent picks the moments, starts each on its hook and reframes it to vertical.

  3. 3

    Review each Short

    Every Short opens as its own timeline. Trim it, swap the opening line, change the captions, or ask for another pass, then export.

What MirrorCut does

  • Moments ranked by hook

    The agent ranks moments by how quickly they grab attention, so the first clips you see are the ones most likely to hold a viewer.

  • Vertical, following the speaker

    Horizontal footage becomes 9:16 with the speaker kept in frame, and 1:1 or 4:5 from the same edit.

  • Captions in 48 styles

    Animated, word-by-word captions that stay in sync when you trim a clip.

  • Every Short stays editable

    Clips aren't flattened videos: each keeps its own timeline with the same tools as the main edit.

  • You approve every change

    Each AI edit is outlined on the timeline and explained in one line. Accept it, revert it, or keep editing by hand; your edits and the agent's share one undo history.

Guides

Free tools

No sign-up; they run in your browser.

Questions

What kinds of long videos work?
Anything where people talk: YouTube videos, webinars, livestream recordings, interviews, lessons and podcasts. For podcasts in particular, see our podcast to Shorts page.
How long should each Short be?
You choose. Ask for a length (for example 30 seconds) and the agent cuts to it; YouTube Shorts can be up to 3 minutes, but most clips that work are much shorter.
Can I also edit the long video?
Yes. The same project edits the full video (pauses, filler, captions, graphics) and the Shorts, so fixes carry over.
What does it cost?
Every account starts with 7 days of Creator free (a card is required). After that, Creator is $10, Pro is $30, Studio is $60 a month, and every yearly payment adds 50 bonus AI credits.

Bring one recording and see your first cut

7 days free, then $10 a month.

Start your free trial