Skin Collection
Paste your Steam profile link to see every skin you own and every one you're still missing. Your Steam inventory needs to be set to Public.
Accepts steamcommunity.com/id/name, steamcommunity.com/profiles/7656…, or a 17-digit SteamID.
Private inventory? In Steam go to Profile → Edit Profile → Privacy Settings and set Inventory to Public.
Load it manually
Steam didn't answer automatically, but you can grab your inventory yourself in a few seconds:
Collected
Also in your inventory
Items that aren't on the skin list above: shards, boxes, and items that were renamed on Steam.