How to turn a long YouTube video into Shorts

A twenty-minute YouTube video usually contains three to eight moments that work as standalone Shorts. Getting them out is a mechanical process, not a creative one, and it takes about twenty minutes once you know the order to do things in. Here's the whole workflow, plus the YouTube-specific details that don't apply to TikTok or Reels.

Step 1: get the source file, not the URL

Start from the original export you uploaded to YouTube, not a re-download of the published video. You already have it, it's higher quality than anything you can pull back down, and re-encoding an already-compressed upload visibly degrades the result on a platform that will compress it again.

This matters practically, because most clipping tools cannot accept a YouTube link at all. YouTube blocks automated downloading, so tools that offer "paste a YouTube URL" are either doing something fragile that breaks regularly or routing around a platform restriction. Ours refuses YouTube links outright and asks for the file, which is less convenient and more honest. Either way: find the export.

Step 2: pick moments that survive without context

The mistake almost everyone makes first is clipping the parts they personally found most interesting. Those are usually the parts that were interesting because of everything that came before them. A Short is watched by someone who has never seen you, mid-scroll, with no setup at all.

The moments that actually work standalone:

• A complete answer to a question. Including the question. This is the single most reliable Short format from interview or podcast footage.
• A claim plus its justification. "Most people get this wrong, and here's why." Self-contained by construction.
• A concrete number or specific. Anything with a real figure, a name, or a date in it tends to travel, because it's checkable and quotable.
• A reaction. Genuine surprise or disagreement reads instantly without any explanation.

What doesn't work: anything beginning with "so", "and", or a pronoun pointing at something said earlier. There's more on this in what actually makes a clip perform.

Step 3: cut on sentence boundaries, both ends

Start one full sentence before the good bit and end one full sentence after it. This costs a few seconds and fixes the most common reason a Short feels broken.

The end matters more than the start. A Short that stops mid-sentence, or on a question whose answer got cut off, reads as a mistake rather than an edit, and it's the last thing a viewer sees before deciding whether to follow you. Read the final line out loud: if it sounds like something was chopped, extend it.

Step 4: reframe to 9:16 without decapitating anyone

Shorts is vertical. Going from 16:9 to 9:16 discards roughly two thirds of the frame's width, and an automatic centre crop has no idea where the speaker actually is. If you're off to one side of frame, or there are two people, check every clip rather than trusting it.

If the footage genuinely needs its width (a screen share, a demo, anything spatial), you have two decent options: keep the original ratio and accept the letterboxing, or crop tighter on the part that matters and lose the rest deliberately rather than accidentally.

Step 5: burn in captions

Most short-form viewing starts muted. Burned-in captions are not an accessibility nicety here, they're the difference between a clip being watched and being scrolled past. YouTube's own automatic captions are soft subtitles the viewer has to switch on, which is not the same thing.

Whatever generates them, read them before posting. Automatic transcription is confidently wrong about names, jargon and anything said over background noise. See what makes a caption actually good for the specifics.

The YouTube-specific bits nobody tells you

Everything above applies to any platform. These four only apply to Shorts:

• Link the Short back to the long video. YouTube lets you attach a Short to the source video it was cut from, which puts a link to the full video on the Short. This is the single biggest advantage Shorts has over TikTok for anyone with long-form content, and it's routinely left unused.
• Post to the same channel. Splitting Shorts onto a separate channel throws away the thing that makes this work, which is that a viewer who likes the clip can immediately find forty hours of you.
• Titles are load-bearing. Unlike TikTok, Shorts titles are indexed and searchable. Write a title someone might type, not a caption.
• Under 60 seconds, and vertical. Anything longer or wider gets treated as a regular video, which is a completely different distribution system.

How many Shorts per video, realistically

Three to eight from a twenty-minute video, and closer to three than eight if the video is a tutorial rather than a conversation. Conversations produce more clippable moments per minute than structured content does, because structured content is usually structured around a single arc that doesn't decompose.

Resist the temptation to hit a number. Five good Shorts beat fifteen where ten are padding, and posting weak clips trains the algorithm on your weak clips. If you want a longer schedule out of a single upload, the honest way to get there is more formats, not more clips.

Doing it automatically

Steps 2 to 5 are what AI clipping tools automate: transcribe the video, rank the moments, cut, reframe and caption them. It's genuinely faster, and it's worth knowing exactly where it still needs you, which is checking the endings and the crop. That's the same list as why AI-generated clips look AI-generated, and it's about sixty seconds of review per clip.

Whether you automate it or not, the order matters more than the tooling: pick standalone moments, cut on sentence boundaries, check the crop, burn in captions, then use YouTube's own linking so the Short does something for the channel rather than just existing.