TikTok Video Size and Length: The Complete Specs Guide

TikTok is built around a full-screen vertical frame. Everything below follows from that, and the single most consequential decision you make is shooting vertically in the first place.

TikTok re-encodes everything you upload, so shooting at 4K does not produce a 4K video on the platform — it produces a compressed one that took longer to upload. Delivering close to 1080 × 1920 means the compressor is working from material that already matches its target, which generally survives the process better than a heavily downscaled file.

Where source quality does show is in motion and low light. Compression struggles most with noise and rapid movement, so a clean, well-lit 1080p clip will consistently look better after encoding than a noisy 4K one.

The frame is full-screen, but a significant part of it is covered by interface. The right edge carries the like, comment, share and profile buttons. The bottom carries the caption, username and audio ticker. On some devices the top is partly obscured by the status bar and the For You / Following tabs.

In practical terms, keep anything that must be read — text overlays, faces, product detail — inside a central column, clear of roughly the right-hand sixth of the frame and the bottom fifth. This is the most common avoidable production mistake, and it is entirely invisible while you are editing in a desktop timeline.

The maximum is not the target. Because completion rate is one of the strongest distribution signals, length is a trade-off: longer videos accumulate more total watch time when they work, and haemorrhage retention when they do not.

The useful rule is to make the video exactly as long as its idea. Trim until removing another second would remove something a viewer actually wanted, then stop. Most creators finish cutting well before that point.

Very short videos have their own trap. A three-second clip is easy to complete, but completions of extremely short videos carry less weight than sustained watch time on a longer one, and a loop nobody chooses to rewatch is not the win it looks like in analytics.

Your cover is what people see on your profile grid, and the grid is a genuine conversion surface — visitors arriving from a video decide there whether to follow. Choosing a frame at random wastes it.

Covers are effectively square in the grid but display taller on the video page, so keep the important content centred. Text on a cover should be short enough to read at grid size, which is smaller than it looks while you are setting it.

If an upload fails or the quality drops noticeably, the cause is usually one of a short list.