The first seconds

§1Why the opening decides

A long video gets a moment of grace. The viewer clicked a title and a thumbnail, so they arrive with a small intention to watch. A Short has no such cushion. It simply starts playing in the feed, and the viewer's thumb is already resting on the screen. The first thing they decide is not whether the Short is good. It is whether to give it another second.

YouTube's own guidance for Shorts says it plainly: capture attention in the first few seconds to prevent viewers from scrolling¹. The signals YouTube names for ranking Shorts point the same way. They include the percentage of viewers who chose to view, average view duration and average percentage viewed². Every one of those numbers is shaped first by the opening, because a viewer who leaves in the first moments takes all three down at once.

In YouTube Studio you can watch this happen through the Viewed vs. swiped away metric, which shows how often viewers watched your Short rather than swiping past it in the feed³. When that share is low, the problem lives in the first seconds: the first frame, the first line, the first sound. No amount of polish later in the video can fix a viewer who has already gone.

§2Reading the retention line

Once a Short has been out for a little while, YouTube Studio shows how viewers moved through it. YouTube's help page on the audience retention report explains how to read the shape⁴. A flat stretch means viewers watched that part from start to finish. A gradual decline means interest is slowly fading, and YouTube notes that videos generally taper off over their length. A spike appears where more viewers watched, rewatched or shared a moment. A dip means viewers abandoned or skipped at that specific point⁴.

That help page describes the report for videos in general, and we read a Short's line the same way. The question is always where the line bends. A sharp fall right at the start means the opening did not land. A dip in the middle usually marks a slow sentence, a confusing cut or a moment where the promise of the opening stopped being kept. A spike near the end of a Short often means viewers watched a moment again.

A second clue sits beside the line. Since 31 March 2025 the public view count includes every start or replay, while the stricter engaged views count was kept for Partner Programme eligibility and revenue⁶. When a Short's public views run far ahead of its engaged views, many people started it and left quickly. That gap and an early fall in the retention line are two views of the same problem, and both send you back to the opening.

§3Three minutes, if it earns them

Shorts used to have a much tighter ceiling. Since 15 October 2024, a Short can run up to three minutes, for square or taller videos; uploads from before that date were left as they were⁵. YouTube's rule is that a video with a square or vertical aspect ratio up to three minutes is categorised as a Short, and that a wider 16:9 frame keeps a video in long-form⁵.

Being allowed three minutes is not the same as needing them. A longer Short asks the viewer to keep choosing you for longer, and every slow passage is a place for the line to dip. A sensible approach is to let the story set the length: a single striking fact may need well under a minute, while a short chain of events, such as how a city rebuilt itself after a fire, may genuinely need more room. If you cannot say what the extra seconds give the viewer, cut them.

Length also has a practical edge with music. YouTube notes that in a longer Short most songs can be used for up to 90 seconds, and that Shorts over one minute with an active copyright claim of any type are blocked globally and cannot be monetised⁵. Narration, original sound and royalty free tracks avoid that trap.

Endings matter more in Shorts than people expect, because the feed plays a Short again if the viewer does not move on. Since 31 March 2025 every start or replay counts as a public view⁶. That is not a reason to trick anyone into a replay. It is a reason to end cleanly on the payoff instead of trailing off with a goodbye. A documentary Short that closes on the answer to its opening question, or on one last detail that recasts the first frame, gives the viewer something worth seeing twice.

• End on the payoff, not on a sign off.
• Cut any closing line that repeats what the viewer has just seen.
• If the last frame can echo the first one, let it, so a replay feels natural rather than forced.

§4How a documentary Short builds a hook

A researched Short has an advantage over almost any other kind of video: it holds real facts, and real facts are often stranger than anything you could invent. The craft is to put the strangest true thing first. In our experience there are three dependable ways to open.

The specific fact. Lead with the single most surprising thing your research found, stated precisely. “In 1919 a wave of molasses flooded the streets of Boston” works because it is concrete, unexpected and true. “Here is an interesting story about Boston” asks the viewer to wait for the interesting part, and many will not.

The sharp question. A question works when the viewer genuinely wants the answer and cannot guess it. “Why do planes avoid flying straight over the Pacific?” is a good one, because the obvious guess is wrong. A vague question such as “Have you ever wondered about planes?” is not a hook, it is a delay.

The striking image. Sometimes the first frame does the work before a word is spoken: a photograph of a ship standing on dry land, a map with a border drawn in a straight line across a desert. The narration then names what the viewer is already staring at. Archival footage is especially strong here because the viewer knows it is real.

Here is how the three forms play out on one subject. Imagine a Short about a city that moved its entire downtown uphill. As a fact: “In the 1850s a city lifted whole buildings, some of them several storeys tall, to raise its streets.” As a question: “Why would a city jack up its own buildings, one by one?” As an image: an archival photograph of a brick hotel standing on hundreds of screws, with the narration beginning a moment later. Each opening points at the same true story, and each gives the viewer a reason to stay for the next sentence. Try writing all three for your own subject before you choose.

What these three openings share is that they skip the background. The year, the place and the context still belong in the Short, but after the viewer has a reason to care. Think of a museum guide who starts at the most astonishing object in the room and then tells you where it came from.

§5Write your next hook

Here is a protocol we suggest for writing the opening of a documentary Short. It takes a few minutes and it is worth doing every time, because the opening is the part of the Short the feed sees first.

1. List the three strangest true things

   From your research, write down the three facts that would make a friend say “wait, really?”. Keep the ones you can back with a source.

2. Pick one and make it concrete

   Choose the fact with the clearest picture in it. Replace vague words with a place, a date, an object or a number that your source supports.

3. Decide the form: fact, question or image

   State the fact outright, turn it into a question the viewer cannot answer, or find the archival image that shows it. Pick the one that needs the fewest words.

4. Cut everything before it

   Delete the greeting, the channel name and the background sentence. The first thing the viewer hears should be the hook itself.

5. Check the payoff and the ending

   Make sure the Short answers what the opening promised, and that it ends on that answer rather than on a sign off.

6. Read the line, then adjust

   After a day or two, look at viewed vs. swiped away and the retention line³⁴. Compare it with your own recent Shorts and carry what worked into the next opening.