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 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.2): Three siblings.

(T.3): You were apprenticed or sent to be trained. Roll on Table 4 to determine who by or what as.

(T.4): Looks like your quest for knowledge isn't even going to start! You got delayed en route. Find out why on Table 17.

(T.17): You become lost. Survive the wilds on Table 24.

(T.24): You stumble across a druid who is impressed by you and teaches you lore about the wilds. You will have proficiency in Nature. He escorts you to a road where you join a caravan on Table 20.

(T.20): The earth shakes as a Bulette appears and begins to destroy the caravan. You fall through a crevasse opened up by the beast and tumble down to Table 25.

(T.25): Beneath the earth you are suddenly confronted by a mind flayer. It waves its tentacles and you black out. When you come too, you eerily seem to have new knowledge. You will have proficiency in Arcana and are able to read, write, understand and speak deep speech. You also are somewhere else entirely: roll on Table 8 to see where.

(T.8): A haunted house. You escape, but are left with a curse. See Table 7.

(T.7): You were cursed to never again taste food or experience any joy from music or song. Can you find the information you need to lift this curse on Table 11?

(T.11): You turn up nothing. Your life of adventure begins with no progress made in this search.


Total Rolls: 11
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:
Animal Handling
Nature
Arcana
Language: Deep Speech