If you specifically want third-party tools, some creators use free AI-based upscalers like
The transition to 4K resolution has been a significant leap forward in the world of digital video, offering four times the resolution of 1080p HD. However, not all footage is shot in 4K, and much of the existing library is in lower resolutions. This disparity has created a need for effective upscaling solutions that can breathe new life into lower-resolution content, making it compatible with the high standards of modern displays and deliverables. instant 4k plugin after effects free
Increase "Sharpen" under the Creative tab to 25. Unsharp Mask: Set Amount to 30 and Radius to 1.0. If you specifically want third-party tools, some creators
: Press Ctrl+K (Windows) or Cmd+K (Mac) and set your resolution to 4K (3840x2160). If you specifically want third-party tools