@ELS@sfba.social it depends on what you plan to do with them and how many there are. I use a flatbed scanner to do it, but I have thousands to do and want them super high resolution so I never have to do it again, ever. You can snap them with your phone or other camera pretty quickly and effectively. There are dedicated devices that accept a stack of slides and do a bunch automatically that sound pretty good and economical. The main thing I've learned that's helpful is to keep them in order, possibly write a number on them, so if you do need a better scan someday, you can find it. (also, in general for any famliy photo item, write a description on it in pencil or on the back for photos, so that someday whoever finds it will know what it is