the lightshot program from prntscr.com is safe, i've been using it for months with no problems, as have many others on td.
But if you want you can download it directly from google for their chrome browser
https://chrome.google.com/webstore/detail/lightshot-screenshot-tool/mbniclmhobmnbdlbpiphghaielnnpgdp?hl=en
If you don't trust google then I don't know what to tell you...