A safe can be an important tool to protect your valuables and keep your belongings, especially if you have large amounts of money or important documents to store. However, if you forgot the combination to your safe and cannot open it, your safe becomes far less useful. Without the combination, you have several options for opening your safe.
Call the safe company. Some company customer service departments will give you your combination based on the serial number and your proof of ownership. You may need to provide a notarised letter stating that you are the owner of the safe. The next time you buy a safe, register your ownership immediately with the company so that you can immediately retrieve your combination without the hassle of a notarised letter.
Call a locksmith. If you do not have proof of purchase--for example, if the safe is too old, or if you were not the one who bought it--you will not be able to get the combination from the company. A locksmith can help you with combination safes, especially if the combination is only a couple of numbers. Some safe combinations have as many as six numbers, making them more difficult to crack.
Try more drastic measures. If neither the safe company nor the locksmith can help, you might try destroying the safe to get it open. This can involve using a drill at the correct angle, which will vary by safe, using an axe to take off the door, or even using dynamite. Use proper safety procedures, such as working outside, wearing safety goggles, and soliciting professional advice, and realise that such procedures will damage your safe and may damage the property inside if not done carefully.