www.jdoodle.com/execute-cobol-online

Alternative IDEs:
   www.tutorialspoint.com/compile_cobol_online

these IDEs give different results for some decision algorithms:
   paiza.io/en/projects/new?language=cobol
   ideone.com/l/cobol - the Cobol button must be set to COBOL 85

Message with empty STDIN:

 JDoodle - Timeout 
If your program reads input, please enter the inputs in the STDIN box above or try to enable the "Interactive" mode option above.
Please check your program does not contain an infinite loop. 
Contact JDoodle support at jdoodle@nutpan.com for more information.

Message with ...

JDoodle - output Limit reached.

Čev - Technical Museum Brno / Czechia, May 2020