1. Using the Steam client
You can easily look up your Steam ID by retrieving it from the Profile URL. You might need to look hard and jot down the ID somewhere manually but this method is the most efficient and safe.
2. Using a third party website
You can obtain details regarding your Steam ID 64 from a third-party website. Do note that for this solution, you still have to follow the steps listed above. This is more like an extension of the first method.
Note: Never enter your credentials (password or account name) on any third-party website claiming to provide you your Steam ID and information. They are mostly a scam and can lead to your account being compromised. If you think you already did such an action, please reset your password as soon as possible. If you are unable to do so, contact Steam support and request them to take action.
