The zhimin-dev / iptv-checker repository on GitHub is one of the most active versions, offering zip releases for Windows ( x86_64-pc-windows-msvc.zip ) and other platforms.
Beyond just "online/offline" status, many versions capture screenshots, identify video/audio codecs, and detect low framerates. Download IPTV Checker zip
Automatically scans hundreds of links from an M3U file to check their status. The zhimin-dev / iptv-checker repository on GitHub is
Depending on your platform and technical comfort level, you can download the "IPTV Checker" zip file from several reputable repositories: many versions capture screenshots
Once the check is complete, the tool can save only the working streams into a new, "clean" M3U file.