Changing my multisite WP install from HTTP to HTTPS – Still getting mixed content SSL errors.

I have a multisite wordpress installation that I’m attempting to force SSL browsing for ALL pages and content on the sites.

I have a wildcard SSL certificate installed but have been unable to completely secure all pages because of some images that refuse to update to https.

I have tried a few different plugins to help resolve this (WP SSL, SSL Fixer…etc) to no avail.

I manually edited the image urls but they do not appear to be updating.

There is a plugin called Search & Replace but I’m hesitant to use such a function as it may cause permanent damage to our database.

TL;DR

Is there any way to quickly and efficiently update ALL media links to https?