Facebook Feed Carousel Ad Specs: 1:1, 80/20/18 Text Limits

What are the Facebook Feed carousel ad specs?

Meta's Facebook Feed carousel page lists a 1:1 ratio at a minimum of 1080x1080 for both image and video cards, with images up to 30 MB and video up to 4 GB. Video cards can run from 1 second to 240 minutes with a 3% tolerance. A carousel has 2 to 10 cards. Text limits are 80 characters of primary text, 20 for the headline and 18 for the description.

Compare this with the Instagram Feed carousel, where video cards top out at 2 minutes and primary text is 125 characters. The two Feed placements look similar and have different limits, so one export does not satisfy both. I read the page on 2026-10-03.

Where do creators trip on these limits?

The 18-character description and 20-character headline are the tightest. A product name plus a size will often overflow. Write the card headline first, count it, and only then write the primary text. The 80-character primary text is shorter than the 125 you may be used to from Instagram.

How do I make square cards with Sume?

Image cards: POST /v1/images with aspect_ratio: "1:1". Video cards: trim a segment with precision: "exact" and output: { "width": 1080, "height": 1080 }. Trim is listed at $0.02 per job, and the conform range of 256 to 2160 covers the square. Source clips must be Sume-hosted, and each write needs an Idempotency-Key header.

Cut every video card from the same master so the colour and audio level match. A card that is louder than its neighbour is the first thing a viewer notices when swiping.

• Use image cards for a range of products, video cards for a demonstration.
• Keep each video card to a single idea; the 240-minute ceiling is not a target.
• Count the three text fields before upload.

Is a longer video card ever a good idea?

The ceiling exists for tutorials and long demos. For a carousel, short cards usually serve better because the viewer chooses what to open. If you do have a long demo, trim it into chapters, one per card, and give each its own link. Check Meta's current carousel rules for per-card links.