How to Upscale AI Video to 4K, Step by Step

A 5-second clip at 480p costs a fraction of the same clip at 1080p, and when you're still testing prompts, most of your generations will be thrown away. That's the case for a two-step workflow: explore at a low resolution, then upscale only the take you actually use.

AI video models balance motion, consistency and resolution, so many clips come out at 480p or 720p. A dedicated upscaler then rebuilds detail frame by frame while keeping it consistent from one frame to the next, so the result doesn't shimmer or flicker.

Upscaling magnifies whatever is there, flaws included. Fix these at the generation stage in the Video Lab before you spend credits on resolution:

Warped hands or faces in motion: simplify the movement or regenerate.

Objects that appear or vanish: add "no new objects" to the prompt, or use a last frame to pin the ending.

A soft first frame: if you animated an image, make it sharper first. Run it through Image Upscale (2K, 4K or 8K for 8, 10 or 12 credits) before animating.

If you're choosing a model for a clip you plan to upscale, our AI video generators comparison covers the trade-offs.

1080p (16 credits): the right target for most social video and Shorts, and the biggest visible jump from a 480p source.

2K (28 credits): extra headroom if you'll crop or reframe in your editor.

4K (56 credits): for YouTube uploads meant to be watched on large screens, client deliverables and footage you'll mix with 4K camera material.

The price is per video, not per second, so a 3-second clip and a 15-second clip cost the same. Clips longer than 15 seconds have to be trimmed or split first, since the upscaler accepts 3 to 15 seconds (up to 50 MB).

Open Video Upscale, upload the clip (3 to 15 seconds, MP4, WebM or MOV), choose the target and start the job. The ByteDance Video Upscaler handles live action, animation and vertical shorts, and focuses on recovering detail and keeping it stable across frames.

When it's done, review it full screen at 100% rather than on a phone preview. Watch moving edges such as hair and hands, fine repeating patterns like fabric or brick, and any text in the frame. If something looks off, go back to the generation rather than upscaling the upscale.

Edit with the upscaled file, not the original, so captions and cuts sit on the sharper footage. Export from your editor at the same resolution you upscaled to, and keep your editor's export bitrate generous: a 4K upload squeezed through a low-bitrate export can look worse than a clean 1080p one.

Matching resolutions also matters when you cut AI clips together with your own footage. Upscale every AI clip to your timeline's resolution so nothing looks softer than the shots around it.

An example: four test generations of a 5-second Seedance 2.0 clip at 480p (35 credits each, 140 total), then one 4K upscale of the keeper (56) comes to 196 credits, against 300 for four takes at 720p before any upscaling. New accounts get 25 free credits on sign-up; plans start at €10 for 600 credits on the pricing page.