Atharv Joshi
Forum Moderator
Hi Yohann, 
 
Can you explain why you want to start SpaceClaim in read-only mode?
 
SpaceClaim opens in read-only mode only when you don’t have a valid license to use it and all functionalities are grayed out. 
Let me check about the online viewer and get back to you. 
 
Thanks and Regards
Atharv