Open the YouTube video you want to loop and copy the URL from your browser's address bar. On mobile, tap [Share] → [Copy link] as shown in the images.

Paste the copied URL into the input field at the top of the page, and the video will load.

You can set the loop section using one of two cursors:

• Current playback position (blue circle button)
• The position where the playback was last manually adjusted (red vertical line button)

After setting, the seek bar will look like this:

You can fine-tune the marker position using the "Adjustment" slider. Adjust within any range such as ±10 seconds. You can also click the [< 0.05s] and [0.05s >] buttons for even finer time adjustments.

Click 'Save' to store your loop section in the browser, so you can use it again next time. You can also edit or delete section names.