Shloosl are not locksmiths and state as much on their website. They are simply a key duplication service. They completely recommend you to visit your local locksmith for all things lock and key related.
1. Hold the key in your hand, in front of an untextured wall or table
These are great pictures
2. Take a sharp picture of the entire key from about 4 inches away
Focus the camera on the blade. Capture the entire key, including the head.
3. Email pictures to email@example.com
Send the highest resolution available. Send several pictures just in case.Hint: if you're viewing this page on your phone, click the link above and attach photos to the email.
Of course, there is no better method than taking your key to a professional local locksmith, but sometimes you either dont have the time or the desire to hunt around to find one near you or, reputeable locksmiths that do quality work may be few and far between.
I am a little dubious as to the quality of this product offering, primarily because many keys offered for duplication to locksmiths are already quite worn and often difficult to decipher accurately by photo.
Plus, a significant quantity of key duplicators (like the ones found in hardware stores) are rarely adjusted for accuracy. Most locksmiths, like me, regularly re-allign our machines to have them continually optimized for correct and accurate key cutting.