Most free online converters have a limit (usually 50MB to 100MB). For larger movies, you might need a desktop tool like VLC Media Player.
Often, the "Playit" extension is just a container. Before using complex software, try this free online workflow. online convert playit video to normal video
For tech-savvy users, FFmpeg is the king of conversion. You can use an or the command line. If the Playit file is essentially a raw H.264 stream, this command bypasses the wrapper: Most free online converters have a limit (usually