RCWeb 4K Test
This RCWeb app is designed to be run on a 4K TV web browser. It allows you to test displaying a 4K (3840x2160) image and a 4K (3840x2160) video.
Screenshot
Scan the QR code to open the paired control app on your phone. You can then switch between the bundled 4K PNG and 4K MP4 test media.
Most TV web browsers and streaming devices can not display web pages and images at native 4K (3840x2160). Instead, these browsers render at 1080p (1920x1080) then upscale to 4K.
Zoomed Example of Native 4K Output
Zoomed Example of 1080p Output (Upscaled)
Usually, the only way to achieve native 4K output is by playing a 4K video. This means to display a static 4K image in a tv web browser, you must convert it to a video file first.
Please note, many Samsung TVs will no longer play 4K video in the web browser: