Sume Avatar 1.0 ratios vs TikTok ad ratios: three overlap, two do not

Sume Avatar 1.0 supports five aspect ratios: 1:1, 3:4, 9:16, 4:3 and 16:9. TikTok's non-Spark ad page lists three: 9:16, 16:9 and 1:1. Three ratios overlap, and 3:4 and 4:3 do not, so an avatar made at either needs a crop or a different ratio before you use it as a non-Spark ad.

Ratio table

Both lists come from the named pages.

Other avatar limits

Avatar 1.0 resolution is 720p at this time, and a script run is 4 to 60 seconds. 720p at 9:16 is 720x1280, above TikTok's 540x960 minimum, and 1:1 at 720x720 is above 640x640. Those pixel sizes are the arithmetic of the ratio at 720p, so probe the real file before upload.

Practical choice

Keep the default 9:16 for a TikTok ad. If you generate at 3:4 for another placement, remember that 3:4 is not a TikTok ad ratio on that page, and convert with Video filter or a Timeline render at 1080x1920.

Finally, TikTok's file rules apply to the output: mp4, mov, mpeg, 3gp or avi, up to 500 MB.

A crop that is cheap

Cropping a 3:4 avatar to 9:16 keeps the full height and trims the width: a 3:4 frame of 720x960 cut to 9:16 would be 540x960, which is exactly TikTok's 9:16 minimum. A 540-wide crop loses 180 of 720 pixels, or 25 percent of the width, and the avatar's head and shoulders must still sit in the centre. Check the frame with video inspect before you accept it.

Video filter can crop and dim a hosted clip; read its docs page for the supported operations and the price. Generating at 9:16 in the first place avoids the crop.

Avatar scripts and length

An avatar script is 4 to 60 seconds in a single job; the docs tell you to shorten or split anything longer. A 60-second avatar at 9:16 sits well inside TikTok's 10-minute non-Spark limit, and the file limit of 500 MB is far above what a 60-second 720p clip needs.

Remember the default is 9:16 and the resolution is 720p only, so the choices you actually make are the ratio and the script length.

Square avatars

A 1:1 avatar at 720p is 720x720, which clears TikTok's 640x640 minimum for square ads. The Sume docs also describe voice.type: "silence" as a beat with no speech, and captions as an optional burn-in after generation, so a square avatar ad can carry its own captions. Keep the caption lines away from the frame edge, and probe the output before upload.

Whichever ratio you pick, the script length is capped at 60 seconds, so a longer message needs several avatar jobs joined in Timeline.

Choosing between 9:16 and 1:1

Use 9:16 when the placement is full screen and 1:1 when a feed shows a square crop. TikTok's page lists both as supported shapes for non-Spark ads, and it recommends 9:16. The avatar docs default to 9:16 as well, so no setting is needed for the recommended shape.