This is an old method but so many new members did not know it!
it contains only 2 steps!
1 : You need a combo list ofc ( You can search existing topic under combo lists)
2 : Go To** **https://checkz.net/tools/checkers its a website that contains online checkers so u just need to put your combo and he starts checking and it’s done!
NOTE: not all checkers are fast ! and there are some nonworking checkers too!
I suggest the Spotify and the league of legends checkers
Enjoy!