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): One or both of your parents were spies; and they raised you to become a spy as well. After determining whether you have siblings by getting a result from Table 2, proceed to Table 29 instead of proceeding to Table 3 as normal.

    >>>> (T.2): You are the youngest of a 7 sibling family.

(T.29): The target turns out to be a friend. You betray your employers and help them instead on Table 18.

(T.18): Your friend needs help in illegal activites: roll on Table 15. You succeed, but the local criminal organization is alerted to your unsanctioned activities. Find out the consequences of Table 26.

    >>>> (T.15): Spying.

(T.26): You become one of the greatest members of the group. When the group's current leader is killed by a rival, you take his place. Roll on Table 5 to see who the rival was. You will have proficiency in Sleight of Hand and Stealth. Additionally, regardless of your background, you have the Feature: Criminal Contact from the criminal background. Your life of adventure begins.

    >>>> (T.5): A doppelganger.


Total Rolls: 7
Your age is TEENAGER
Teenagers are dexterious and hardy, and often are cocky enough to be quite assertive and convincing. Unfortunately, this does not translate into 'real' wisdom or intelligence, and a teenagers body still has some growth to do before they'll be at peak strength.
+1 CHA, +1 DEX, +1 CON, -1 INT, -1 WIS, -1 STR

Proficiencies:
Sleight of Hand
Stealth
Feature: Criminal Contact (criminal background)