TikTok streaming ads specs: 2:3 card image and 35-character title

TikTok's streaming ads page asks for a card image at 2:3 and at least 500x750, a title of up to two lines and 35 characters, and video that follows the in-feed guidelines. Sume can produce the card with a 2:3 image request. Read 2026-09-29.

What does TikTok list?

Video is not given its own table; the page points to in-feed rules (9:16 at 540x960 or larger, per the auction page).

How do I generate a 2:3 card?

2:3 is in the image docs' ratio list. With openai/gpt-image-2.5, use image_size 1024x1536: both edges multiples of 16, 1,572,864 pixels (inside 655,360 to 8,294,400), and exactly 2:3, above the 500x750 minimum.

curl -X POST https://api.sume.com/v1/images \
  -H "Authorization: Bearer $SUME_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "openai/gpt-image-2.5",
    "prompt": "Streaming series key art, lone astronaut on a red dune, clear space at bottom for a title",
    "image_size": "1024x1536"
  }'

Should text go in the image?

The page treats the title as a separate field, so leave the bottom clear rather than having the model draw text. Image models can misspell text; add the title in the ad tool.

What are the limits of this answer?

Sume does not submit streaming ads. Check TikTok's page for the current specs before you deliver.