How to Make YouTube Shorts From Long Videos in 5 Steps

To make YouTube Shorts from a long video, find the two to five moments that work without context and cut each one to a single idea. Then reframe it to vertical 9:16, add word-by-word captions and open on the payoff instead of the setup. The slow part is finding the moments. With Cut Express connected to Claude, you upload the long video and ask for the best moments. Claude cuts the Shorts from a ranked list instead of from your memory of the recording.

Which moments in a long video make good Shorts?

A good Short is a moment that lands for someone who never saw the full video. Look for:

• A clear result. The finished build, the reveal, the final score.
• A strong reaction. Laughter, surprise, a heated disagreement.
• A self-contained explanation. One question, one answer, under a minute.
• A line people would quote. The sentence you’d put on a thumbnail.

Skip intros, sponsor reads, “as I said earlier” callbacks and anything that needs the previous five minutes to make sense. If you have to explain the setup in a caption, it isn’t a Short yet.

What are the 5 steps from long video to Short?

1. Find the candidates. Scrub the timeline, read the transcript, or let a tool flag the stretches where something happens.
2. Cut to one idea. Start as late as you can and end as soon as the point lands. Most cuts get better when you remove the first sentence.
3. Reframe to 9:16. Crop around the speaker or the action, or place the wide shot over a blurred or colored background. Our guide on converting horizontal video to vertical covers the three ways.
4. Caption it. Your viewer is probably scrolling with the sound off. Word-by-word captions keep the eye moving with the speech (styles that work).
5. Open on the payoff. Move the best line or the result to the first second, then let the clip explain how you got there. See the first 3 seconds for opening patterns.

How do you find the moments without rewatching the whole thing?

You have three options, and they stack.

Method	What you look at	Good for	Weak at
Transcript	What was said, with timestamps	Talks, podcasts, tutorials	Silent action, gameplay
Contact sheets	Frames sampled across the video	Spotting scenes and locations	Short events between frames
Signal peaks	Loudness, motion and scene changes over time	Reactions, action, gameplay	Quiet but important lines

A transcript tells you what was said. Signals tell you where something happened. Together they cover most videos. For a podcast or a talking head, the transcript does most of the work. For gameplay or an event, the signals do. Gameplay highlights goes deeper on the silent case.

How does Cut Express turn a long video into Shorts?

You stay in the chat. The steps map one to one:

1. Open the Cut Express upload panel in Claude and drop the long video.
2. Ask: “Find the best moments for Shorts.” Cut Express analyzes the file for sound peaks, movement and scene changes, then ranks the candidate moments as highlights, each with a sheet of frames and a time range.
3. Claude reads the moments (and the transcript, when you ask for one) and picks the ones that stand alone. Then it zooms into each with a dense sheet of frames to find the exact in and out points.
4. Claude writes the edit: 9:16, a crop that follows the subject, and word-by-word captions in the style you pick. The strongest line goes first.
5. Each Short renders as its own video. “Make the second one shorter” or “captions in yellow” renders a new version, and every version stays in your account.

A prompt that works:

“This is a 22-minute interview. Find the 4 best moments for YouTube Shorts, each under 45 seconds, open each one on its strongest line, pop captions, 9:16.”

The how it works section shows the same loop on one screen.

How long should each Short be?

As long as the idea needs and no longer. A punchline might be 12 seconds; a tight explanation might be 50. YouTube allows Shorts longer than a minute at the time of writing (check the current limit in YouTube Studio), but length is never the goal. Cut until removing anything else breaks the point. Our reel length guide applies to Shorts too.

What makes a Short from a long video feel native?

• Vertical framing that follows the subject. A centered crop of a two-person shot cuts someone in half. Pick a focus point per scene.
• No dead air. Trim the breath before a sentence and the pause after.
• Captions sized for a phone. Three or four words per line, a heavy font with an outline.
• Sound that stays clear. If you add music, keep it under the voice.

FAQ

How many Shorts can I get from one long video?
It depends on the video. A dense hour-long interview can give a dozen; a slow vlog might give two. Cut fewer, better clips rather than every passable moment.

Do I need the transcript?
For talking videos, yes: it’s the fastest way to find quotable lines. Cut Express makes a transcript on credits, once per file. For gameplay and events, the moment detection works from sound and movement without any speech.

Can I make a 16:9 version too?
Yes. Ask for a 16:9 cut of the same edit and it renders as the next version, in 1080p, or 2K on Ultra.

Does it cost extra to find moments?
No. Finding and ranking moments is free; renders use your monthly render minutes. Details on the pricing page.

Cut your next Shorts with Cut Express

Cut Express is the video editor you drive from Claude. Upload a long video, ask for the best moments, and get Shorts with captions, reframing and a strong first second. See the plans or browse more guides on the blog.