A negative prompt lists what the model must avoid: artifacts ('distorted hands, extra fingers'), styles ('no cartoon look'), or content ('no text overlays'). In production systems it's the quality floor — v4v injects global negatives into every render (no warped hands, no floating objects, no mirror artifacts, no product transformation) plus category-specific ones (jewelry: no fake influencer excitement). You rarely write negatives yourself in the directed flow; in the Lab they're a power tool for stubborn artifacts.
Why negatives matter for products
The costliest failure in product video is the product changing — a ring becoming earrings, a label rewording itself. Preservation negatives pin the product; that's the difference between an ad and an error.
Writing effective negatives
Be concrete and short: name the specific artifact you saw ('no double rims on the glass'). Endless negative lists dilute; targeted ones fix.
Paste a product link. The brief builds itself.
Generate product videos, UGC-style ads and hooks in about 5 minutes.
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FAQs
Do negative prompts guarantee clean output?
No — they shift probability. QA stays in the loop; regeneration is cheap.
Does v4v expose negative prompts?
Defaults are automatic; the Lab accepts custom negatives per generation.
Facts checked July 16, 2026. Competitor claims from public pricing pages; verify before relying on them.