ULS Viewer is a Windows application that provides a simplified view of ULS log files in SharePoint 2013 that supports aggregation, filtering, sorting, highlighting, append, and more.
Dowload:
https://www.microsoft.com/en-us/download/details.aspx?id=44020
Deafult log location:
C:\Program Files\Common Files\Microsoft Shared\Web Server Extensions\16\LOGS\
Visual:
