With the file location open, press the Windows logo key + R, type shell:startup, then select OK. This opens a file folder window for the location where the shortcut of Signal is saved. Right-click Signal, select More, and then select Open file location.

Select the Start button and scroll to find Signal (the app you want to run at startup). So here are step by step instructions for Windows 10 assuming Signal Desktop is already installed on your computer and you are logged into Windows: Unlike some other programs, Signal desktop has no setting within Signal to automatically load when your computer boots and user logs into Windows. Keep in mind that loading Signal Desktop will add some burden to the computer's operating system and will be accessible without a password - this may be a security problem for some users. The solution is to have Windows automatically start Signal on boot/login and regularly boot/login that computer - then Signal will more likely sync. For example, if you usually use Signal on mobile devices and only rarely load it on your Windows computer then you may find your messages missing in the desktop version of Signal.

If Signal is NOT running on your computer then it will not sync your messages. To 'sync' between your mobile and desktop versions, the Signal app must be running on all devices. How to add Signal to run automatically at startup in Windows 10

Signal desktop windows