Hi! I need to know if there's a way to log out every devices that are connected to my account.

I suspect someone got into my account and is deleting my characters. I changed the linked Gmail account but when I go back to the app it still logs in automatically, and maybe it's the same for every device too.

I would appreciate if a mod can help me 😩

Login to the original Gmail/Google account, head to google.com and click your profile icon then the 'manage your account' button. On the left click 'security' and then scroll down to the 'devices' section and click the link below the list 'manage all devices'. From there you can select a device and click 'sign out' to force that device to be signed out. You will need to this for each device.

Done, thank you so much! Is there any way to double check if another device is logging into my DndBeyond? Just to make sure everything is fine.

On website hover over your profile name at the top-right and select Account. From here you can see all linked accounts and be able to unlink them. 

Then you can go to the Mobile Devices tab. You will see a list of mobile devices signed in to D&D Beyond, presumably through the app. You can delete these. 

And is there a way to see all devices (not mobile, like computer devices) signed to my account? Because that's what I'm worried about.

No, but if you use the Google method, anyone logged in by website will be logged out. The mobile method means anyone using the D&D Beyond app will be logged out. 

Doing both means your account is secured - all logins for them are logged out.

Thank you!

How? I go to that tab and it just shows a list of the devices that have logged in, but I don't see how you can "delete" them. I know this is a rather late querey but mercifully this isn't a year old yet.

I have the same issue as PaisleySnow. I see the list of all the mobile devices but I cannot delete them. I sadly lost access to my phone entirely and I can't log out from the phone. I need to do it from the website but I just don't know how.
I even tried unliking the google account from my google dashboard entirely and also from dnd beyond website but when I checked in a different mobile I do have access to, this did not kick me out of beyond and both mobiles are still listed in my account page.