When a video won't play smoothly

Smaller sizes, converted as you watch, chosen for you when needed.

If a video stutters or won't play on your phone, open the quality menu at the top left of the player and choose a smaller size. x4u then converts the video as it plays. Phones often can't keep up with 8K, and some can't play certain formats at all.

When a device says it can't play a video, or a size stops loading, x4u moves to the next size down by itself. And when a video keeps stalling because the connection can't keep up (8K over Wi-Fi, say), it switches to a smaller size from the same moment and says so, with a button to go back to the original.