This tool is based on the work of user Arachobia on RPG Crossing with his permission. He had taken a list of tables from Dragon magazine #422 in an article called "Building Character" by Matt Sernett and updated them for 5th edition. I've turned them into an automatic tool for generating a characters background.

Instructions: Refresh the page to generate a new background story. As always, you can use it however you like and fill in your own details. Your age and acquired proficiencies are listed at the bottom and are based on the results you got. Try to pick a Race/Class/Background combo that fulfills all the proficiencies. Your age may also result in ability score modifiers that can be applied after building your character.

...or ignore everything and do whatever you want. Whatever.
Background Generator

(T.101): If this is your 1st roll on this table you were adopted. Roll on this table another maximum of two times* as if it is your first and 2nd roll, for your biological parents, then again maximum of 2 times* (again as if it is your 1st and 2nd roll). After this, you may move on to Table 2.
Biological Parents:

    >>>> (T.101): One of your parents was a criminal. Roll on Table 15 to determine what crime(s) they committed. Regardless of what they did, you will have proficiency in Intimidation.

    >>>> (T.15): Spying.

    >>>> (T.102): One of your parents was a noble. You will have +25% starting gold and proficiency in Insight.
Adoptive Parents:

    >>>> (T.101): If this is your 1st roll on this table you were raised by animals or beasts. They can either be unintelligent creatures like wolves, or a sentient animal like a unicorn. You will have proficiency in Animal Handling. Continue on to Table 2 and it is up to you whether any siblings you have were your biological siblings, or your animal-parents own young, or a mixture.

    >>>> (T.102): One of your parents was a scholar and teacher. You will have proficiency in History.

(T.2): An older brother.

(T.3): Your family is ensorcelled. A wizard offers to help remove the spell, but only if you help them out in exchange. Roll on Table 10.

(T.10): You manage to ruin a ritual, and a demon is conjured forth. As the wizard and the demon have their fight, you flee to Table 19.

(T.19): With the constant need to evade those who pursue you, you develop a lack of trust and are always trying to suss out everybody's intentions. You will have proficiency in Insight. Roll on Table 8 to see where you eventually end up.

(T.8): A secret bandit hideout. They left some gold lying around which you take. You will have +10% starting gold. However, now you have to escape them on Table 19.

(T.19): You evade your pursuers for now, but you know they are never going to be far behind and you must remain alert. You will have proficiency in Perception. Your life of adventure begins.


Total Rolls: 12
Your age is ADULT
Adults are at the most equalized stage of development. From here their physical body will begin to weaken while their minds and personalities benefit from experience.
Adults have no modifiers to their attributes.

Proficiencies:
Intimidation
25% More Starting Gold
Insight
Animal Handling
History
10% More Starting Gold
Perception