Here are some top AI tools to enhance old wedding videos to 4K resolution:

1. Topaz Video AI: Known for AI video enhancement and 4K wedding video upgrades, it sharpens details and improves video quality.
   
   

2. YouCam Video Enhancer: A simple tool to upgrade wedding footage to 4K, reduce blur, and enhance clarity.
   
   

3. Flixier Video Enhancer: A browser-based tool for upscaling low-resolution videos to 4K, adding sharpness, and reducing noise.
   
   

4. Media.io Video Enhancer: An online tool that upscales videos to 4K and reduces noise for better quality.
   
   

5. Cutout.pro Video Enhancer: Specializes inold wedding film enhancement and noise removal, with 4K upscaling features.
   
   

6. CapCut AI Video Upscaler: A free tool for 4K wedding video upgrades, offering easy controls for fast results.
   
   

7. HitPaw Video Enhancer: Enhances wedding footage with AI upscaling, noise reduction, and color correction.
   
   

8. TensorPix: An online AI upscaler that improves video quality and upscales old footage to 4K.
   
   

Winxvideo AI: A desktop tool that upscales to 4K and enhances old footage with clearer details.