What aspect ratio should a TikTok video use?

For a video meant to fill a phone screen in TikTok’s vertical viewing experience, 9:16 is a practical starting point. It describes the frame’s shape: nine units wide for every sixteen units high. A 1080 × 1920-pixel export has that shape; so does 720 × 1280. Resolution and aspect ratio answer different questions, so there is no single pixel count that defines 9:16.

TikTok’s current business guidance recommends a vertical 9:16 frame for in-feed ads, while listing square 1:1 and horizontal 16:9 ad formats separately. Those are ad specifications, not a blanket rule that every ordinary post must use 9:16. TikTok Studio’s web-upload help separately describes a 720 × 1280-or-higher resolution for that web workflow. Do not apply an ad’s technical minimum or a web-upload requirement to every type of TikTok post.

Aspect ratio versus resolution

Aspect ratio is width compared with height after the dimensions are reduced to their simplest terms. Divide both sides of 1080 × 1920 by 120, and you get 9 × 16. Divide 720 × 1280 by 80 and you also get 9 × 16. The second file has fewer pixels, but its frame has the same shape.

When setting up a project in an editor, choose a vertical canvas that matches the source video and preserves the picture you want. If you already filmed horizontally, dropping it into a vertical frame can crop the left and right edges or leave empty space, depending on the editing choice. Preview the result before exporting. Stretching footage to fill the canvas can distort faces and objects; scaling with a crop or background usually preserves their proportions.

A simple vertical-video workflow

1. Start with a 9:16 canvas if the final video is intended for TikTok’s vertical feed.
2. Place the main subject in the frame with enough room around it to survive reasonable cropping on different screens.
3. Keep important words and details away from the outer edges, caption area, and controls that appear over the video. Check TikTok’s actual posting preview rather than assuming one fixed safe-zone template suits every post.
4. Export, upload, and inspect the preview before posting. If text is obscured or the crop feels too tight, revise the edit and preview again.

TikTok’s editor lets creators add text to a recorded or uploaded video and move it within the frame. Its Help Center also lets creators choose a cover frame before posting. Use those previews to check that a title remains readable and the cover communicates the subject without relying on the entire full-screen frame being visible everywhere.

What if the original video is square or horizontal?

You can prepare it for a vertical presentation without pretending that its original shape changed. For example, place the square or horizontal footage inside a 9:16 canvas with a designed background, or crop to the area that matters. The right choice depends on whether losing material at the edges would hide the subject. A wide group shot may need a background; a single centered subject may crop cleanly. Watch the exported file from beginning to end, because a crop that works in the opening seconds might cut off someone who moves later.

For advertising, use the specifications for the exact ad format and placement you are buying. TikTok lists multiple dimensions for Non-Spark in-feed ads, and the permitted formats and safe zones belong to that ad workflow. For an everyday vertical video, treat 9:16 as a useful framing recommendation, then let the actual upload preview reveal any problems with your export.