Should I generate AI video in 1080p or 4K?

For TikTok, Reels and Shorts: 1080p. The platforms display max 1080×1920 and re-compress aggressively — 4K uploads often look worse than 1080p. For YouTube long-form, desktop web hero sections and TV display: 4K if the model supports it natively. 4K upscales of 1080p generations rarely beat native 1080p for short-form.

  • TikTok / Reels / Shorts → 1080p, always.
  • YouTube long-form / desktop / TV → 4K if native.
  • 4K upscales of 1080p rarely beat native 1080p on phones.
  • 4K generations cost 2–4× more credits.

Why 4K loses on short-form

TikTok and Instagram re-encode every upload. Uploading 4K means more re-compression artifacts because the platform has to squeeze more data down to display size. Uploading at exactly 1080×1920 gives the platform less work and a cleaner result.

Where 4K is worth the cost

YouTube long-form on a desktop or TV. Hero video on a desktop landing page. Anything cinema-projected. Outside those contexts, 4K is paying double for pixels the viewer's device cannot display.

FAQ

Does Topaz 4K upscaling beat native 4K?

No — native 4K from the model is sharper. Topaz is for rescuing legacy 1080p, not as a substitute for native 4K.