Mark Webb is a native of Philadelphia, Pennsylvania where he starred for Archbishop Wood under head coach Steve Devlin. He ended his prep career rated as a four-star prospect by ESPN, along with a national ranking as the 25th-rated wide receiver and sixth-best player in the state of Pennsylvania. As a senior, Webb finished with 703 receiving yards and six touchdowns on offense en route to helping his team win the 2016 PIAA Class 5A State Championship.
After committing to play collegiately for Georgia, Webb wasted little time in seeing the field for the Bulldogs. Mainly in a special teams role, Webb participated in 13 games as a freshman.