Know what upscaling can and cannot recover, generate at the highest native resolution first, upscale once at the end of the edit, and use the upscaler built into your generator before reaching for a separate tool.
For anyone asking: How do I upscale a video to 1080p or 4K without making it look fake?
Each one's way of doing it, and the point where it stops.
The Upscale app takes videos made outside Runway, up to 40 seconds, and returns a 4K version as a new generation; Runway's own 720p generations show an Upscale to 4K option. Where it stops: Uploads up to 40 seconds per job; a result you dislike keeps its cost.
The AI video upscaler takes uploaded 3-10 second clips, including blurry, compressed or AI-generated footage, and outputs up to 4K; reference images or Elements help keep key subjects consistent. Where it stops: 3 to 10 seconds per clip; Kling says faces, products and text may change.
Higgsfield Upscale takes any uploaded video or finished generation, with Topaz or ByteDance engines and presets for AI video, UGC, series and old film; Video Deflicker and frame interpolation sit alongside. Where it stops: Each upscale is charged as its own generation, including takes you do not keep.
Select a video and ask the Agent, or right-click and choose Upscale, to get a new 1080p, 2K or 4K version with the Luma or Topaz engine while the original stays untouched. Where it stops: One job up to 120 seconds; longer videos must be split and re-stitched.
After the 1080p export, the Pro or Ultra modes of Agent Two run an upscale model such as Topaz for 4K or HDR, also on MP4s brought in from other tools. Where it stops: The timeline itself exports at up to 1080p; Agent Two Lite cannot upscale.
Omni drafts made in Flow are upscaled to 720p or 1080p, or to 4K on the top tiers, so you draft at low resolution and finish only the chosen clip. Where it stops: Documented only for Flow's own Omni generations; no video upscaling without a subscription.
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