However, for 90% of users—YouTubers, social media managers, corporate editors—the native combined with sharpening and grain will deliver a professional "Instant 4K" look that your audience will never question.
Instant 4K is a class of plugins or presets for After Effects that upscale lower-resolution footage (HD/2K) to 4K using algorithms that attempt to preserve or reconstruct detail, reduce artifacts, and maintain sharpness. Some tools are simple resizing presets; others use advanced interpolation, sharpening, denoising, or AI-based super-resolution.