Completion rate is the percentage of viewers who watch a short video all the way to the end, and on looping feeds it can exceed 100 percent when viewers watch more than once.
On a looping feed, completion is the clearest signal a viewer sent. They did not skip, and they stayed to the last frame of something they could have left at any moment. That is why the format rewards it so heavily.
TikTok replays a video automatically. A viewer who watches a 15-second clip twice has watched 30 seconds of a 15-second video, so the figure goes above 100 percent. Creators exploit this deliberately by making the last frame flow into the first, or by putting a detail in the video that only makes sense on a second viewing.
Chasing completion pushes videos shorter, which lowers total watch time per view. A 12-second video finished by everyone earns far less watch time than a 45-second video finished by half. Which one to optimise depends on whether you are chasing reach or monetization thresholds. See retention rate.
MakeViral renders in the 30 to 60 second range and ends on the payoff rather than an outro. See how to go viral on TikTok.
Retention rate is the share of a video that viewers actually watch, shown as a curve of how many people are still watching at each second, and expressed as a percentage of the total length.
Read moreGlossaryA hook is the opening of a short video, the first line of audio and the first frame of image, whose only job is to stop the scroll and buy the next few seconds of attention.
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