An AI video editor for YouTube, from the long video to the Shorts

Just ask for it

Things you can type to MirrorCut's agent:

• “Tighten the first 30 seconds so the hook lands faster”
• “Remove the dead air, filler words and retakes”
• “Add B-roll when I mention something, and a title at each topic change”
• “Cut the three strongest moments into Shorts with captions”

How it works

1. 1

   Upload your recording

   MP4, MOV, MKV or WebM, from a phone, webcam or camera. Hour-long files are fine; uploads resume if your connection drops.

2. 2

   Describe the video

   Say how long it should be, what to open on, and what to add. The agent builds an editable first cut instead of a finished render you can't change.

3. 3

   Review, then export

   Accept or revert each change, refine through chat or on the timeline, then export the video in 16:9 and the Shorts in 9:16, MP4 up to 4K.

What MirrorCut does

• A stronger opening

  Ask the agent to open on your best line or tighten the first 30 seconds, where most viewers decide whether to stay.

• Pauses, filler and retakes gone

  Long pauses are shortened to a natural length, “ums” are cut, and when you say a line twice the cleanest take is kept.

• B-roll, titles and graphics

  Real stock B-roll when you mention something, and titles, stats, lower thirds and chapter titles from over 200 motion graphics templates.

• Shorts from the same edit

  The strongest moments become vertical Shorts that follow the speaker, with animated captions in 48 styles, each on its own editable timeline.

• Captions for YouTube

  Captions stay in sync after every cut, and you can download them as SRT or VTT to upload to YouTube with the video.

• 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

• How to add chapters to YouTube videosHow to add YouTube chapters with timestamps in the description, YouTube's three rules, automatic chapters, and why chapters sometimes don't show.
• How to edit a talking-head videoHow to edit a talking-head video: cut pauses and retakes, open on your best line, add cutaways and captions, and keep it moving without overdoing it.
• What is an AI video editing agent?What an AI video editing agent is, how editing with a prompt works, how it differs from one-click AI tools and video generators, and what to check before you trust one.

Free tools

No sign-up; they run in your browser.

• YouTube chapters generatorPaste your timestamps and get a YouTube chapter list ready for the description, checked against YouTube's rules: 00:00 first, three or more, 10 seconds each.
• SRT to VTT caption converterConvert caption files between SRT and WebVTT in your browser: paste or drop a file, convert it, and download the result. Nothing is uploaded.

Questions

Can MirrorCut upload to YouTube for me?

Not yet. You export the finished video as MP4 (up to 4K) and the captions as SRT or VTT, then upload them in YouTube Studio.

Does it add YouTube chapters?

The agent can add a chapter title on screen at each topic change. YouTube's own chapters come from timestamps in the description; our free YouTube chapters generator checks they meet YouTube's rules.

Is it for faceless channels?

MirrorCut edits footage you record: talking to camera, screen recordings, interviews and podcasts. It doesn't generate a presenter or voice for you.

Can I edit by hand too?

Yes. It's a real timeline editor: edit by hand, through chat, or both, with one shared undo history.

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.