Before gaining prominence in WWE, Hardy performed for the Organization of Modern Extreme Grappling Arts (OMEGA), a promotion he ran with his brother Matt. After being signed by WWE, the brothers worked as jobbers before gaining notoriety in the tag team division, partly due to their participation in Tables, Ladders, and Chairs matches. With the addition of Lita, the team became known as Team Xtreme and continued to rise in popularity. As a tag team wrestler, Hardy is a former six-time World Tag Team Champion and one-time WCW Tag Team Champion. Apart from his success as a tag team wrestler, Hardy has also had success as a singles wrestler. He is a four time Intercontinental Champion, as well as having held the Hardcore, European and Light Heavyweight Championships. He received his first major main event push towards the end of 2007, including challenging for the WWE Championship at the Royal Rumble in 2008.
Moreover, Hardy is involved in motocross, music, painting, and other artistic endeavors. He is currently a member of the unsigned band Peroxwhy?gen.
Before arriving in the WWF, Matt formed his own wrestling promotion, OMEGA (Organization of Modern Extreme Grappling Arts) with Thomas Simpson. The promotion was a more successful version of the original TWF and included such talent as both Hardy brothers, Shannon Moore, Gregory Helms, Joey Matthews, among others. In OMEGA, each of the brothers portrayed several different characters; Hardy portrayed such characters as Willow the Wisp, Iceman, Mean Jimmy Jack Tomkins, and The Masked Mountain. While there, Hardy held the New Frontier Championship as a singles competitor and the Tag Team Championship with Matt. The promotion folded in April 1998 when they signed contracts with the WWF.
In 2000, the Hardy Boyz found a new manager in their real-life friend Lita. Together, the three became known as "Team Xtreme". They continued their feud with Edge and Christian throughout 2000, defeating them for the WWF Tag Team Titles on two occasions. At SummerSlam the Hardy Boyz competed in the first ever Tables, Ladders, and Chairs match (TLC match), for the Tag Team Titles against the Dudley Boys and Edge and Christian, but were unsuccessful.
Hardy gained attention for his high risk stunts in the TLC matches in the year 2000, 2001, and 2002. He made a name for himself as one of the most seemingly reckless and unorthodox WWF performers of his time. In 2001, Hardy received a push as a singles competitor, and he held the WWF Intercontinental (defeating Triple H), Light Heavyweight (defeating Jerry Lynn) and Hardcore Championships (defeating Mike Awesome and Van Dam on two separate occasions). At the end of 2001, the Hardys began a storyline in which they began to fight, which led to Matt demanding a match at Vengeance, with Lita as special guest referee. After Hardy beat Matt at Vengeance, while Matt's foot was on the ropes, Hardy and Lita began feuding against Matt. In the middle of the feud, however, Hardy faced The Undertaker in a Hardcore Title match and lost. After the match, the Undertaker was scripted to attack both Hardy and Lita, injuring them. On the next edition of SmackDown!, the Undertaker also attacked Matt, also injuring him, in storyline. The Hardys and Lita were not seen again until the Royal Rumble, because WWE did not have another storyline for their characters. The Hardys later came back as a team, and there was never any mention of their previous storyline split.
In early April 2002, the Hardy Boyz began a feud with Brock Lesnar after Lesnar gave Matt an F-5 on the steel entrance ramp, which led to an angered Hardy seeking revenge on Lesnar. At Backlash, Hardy faced-off against Lesnar in his first televised match. Lesnar dominated Hardy and won the match by knockout. Lesnar and the Hardys continued to feud over the next few weeks, with the Hardys coming out victorious only once by disqualification. At Judgment Day, Lesnar gained the upper hand on the Hardy Boyz before tagging his partner, Paul Heyman, in to claim the win for the team. In July 2002, Hardy won his third Hardcore Championship by defeating Bradshaw.
At Against All Odds in February 2005, Hardy lost to Abyss in a "Full Metal Mayhem" match for the number one contendership to the NWA World Heavyweight Championship. Hardy returned the favor by defeating Abyss in a Falls Count Anywhere match at Destination X in March. Hardy then went on to feud with Raven, with Hardy booked to defeat Raven in a steel cage match at Lockdown in April. Hardy was suspended from TNA after no-showing his "Clockwork Orange House of Fun" rematch with Raven at Hard Justice on May 15, allegedly due to travel difficulties. Hardy's suspension was lifted on August 5, and he returned at Sacrifice approximately a week later, attacking Jeff Jarrett. He wrestled his first TNA match in four months at Unbreakable on September 11, losing to Bobby Roode following interference from Jarrett. Throughout October 2005, Hardy became embroiled in a feud with Abyss, Rhino and Sabu. The four way feud culminated in a Monster's Ball match at Bound for Glory on October 23, which Rhino won after delivering a second rope Rhino Driver to Hardy. In the course of the match, Hardy delivered a Swanton Bomb to Abyss from a height of approximately seventeen feet (5.18 m). Later that night, Hardy competed in a ten-man battle royal for the number one contendership to the NWA World Heavyweight Championship, which Rhino also won. At Genesis in November, Hardy lost to Monty Brown in another number one contender match.
Hardy was scheduled to wrestle on the pre-show of Turning Point in December 2005, but once again no-showed the event, again citing traveling problems. Hardy was suspended as a result and did not appear on TNA television again. In March, April, and May 2006, Hardy appeared on several house shows promoted by TNA in conjunction with Dave Hebner and the United Wrestling Federation.
On August 4, 2006, WWE announced that Hardy had re-signed with the company. In the following weeks, vignettes aired hyping his return on the August 21 episode of Raw. On the day of his return, Hardy received a push and defeated then-WWE Champion Edge by disqualification when Lita pulled Edge out of the ring. After failing to capture the Intercontinental Championship from Johnny Nitro over the next few weeks, including at Unforgiven, Hardy finally defeated Nitro to win his second Intercontinental Championship on the October 2 edition of Raw. On the November 6 episode of Raw, Hardy lost the Intercontinental Championship back to Nitro, after Nitro hit him with the Intercontinental Championship title belt. One week later, Hardy regained it on the November 13 edition of Raw, with a crucifix pin. This marked Hardy's third reign as Intercontinental Champion.
With Hardy still feuding with Johnny Nitro and MNM into 2007, he was challenged once again by Nitro at New Year's Revolution in a Steel Cage match for the Intercontinental Championship. Hardy once again defeated Nitro. Hardy then teamed with Matt to defeat MNM at both the Royal Rumble and No Way Out. The next night on Raw, February 19, Hardy was defeated for the Intercontinental title by Umaga. In April 2007, Hardy competed in the Money in the Bank ladder match at WrestleMania 23. During the match, Matt threw Edge onto a ladder and encouraged Hardy, who was close to the winning briefcase, to finish him off. Hardy then leaped off the ladder nearly twenty feet, drove Edge through the ladder with a leg drop, seemingly injuring both Edge and himself. The two were unable to continue the match and were removed from ringside on stretchers.
The next night on Raw, April 2, the Hardys competed in a 10-team battle royal for the World Tag Team Championship. They won the titles after eliminating Lance Cade and Trevor Murdoch. They then began a feud with Cade and Murdoch, with the Hardys retaining the Championships in their first title defense against them at Backlash and again at Judgment Day. The Hardys, however, dropped the titles to Cade and Murdoch on June 4 on Raw. The Hardys earned a rematch at Vengeance but were defeated.
In the midst of feuding with Umaga, who defeated Hardy at The Great American Bash to retain the Intercontinental Championship in late July, Hardy was abruptly taken off WWE programming. He posted on his own website and in the forums of TheHardyShow.com that it was time off to heal, stemming from a bad fall taken in a match against Mr. Kennedy on the July 23 edition of Raw. He made his return on the August 27 edition of Raw beating Kennedy by disqualification after Umaga interfered. The following week, on September 3, Hardy successfully captured his fourth Intercontinental Championship by defeating Umaga for the title.
Afterward, there was the start of a push for Hardy, and at Survivor Series, Hardy and Triple H were the last two standing to win the traditional elimination match. Hardy began an on and off tag team with Triple H, which eventually led to a respectful feud between the two. The feud continued at Armageddon, when Hardy defeated Triple H to become the Number 1 Contender for the WWE Championship. In the weeks leading up to the Royal Rumble, Hardy and Orton engaged in a personal feud. It began when Orton kicked Hardy's brother, Matt in the head in the storyline. Hardy, in retaliation, Swanton Bombed Orton from the top of the Raw set and seemed to have all the momentum after coming out on top in their encounters. Hardy, however, lost the title match at the Royal Rumble, but was named as one of six men to compete in an Elimination Chamber match at No Way Out, where he survived to the final two before being eliminated by eventual winner Triple H.
During the March 3 edition of Raw, Hardy appeared on Chris Jericho's "Highlight Reel" segment as a special guest, but ended up delivering a Twist of Fate to Jericho. This led to an Intercontinental title match on the following Raw where Hardy dropped the title to Jericho. Off-screen, Hardy dropped the title after he was suspended for sixty days, as of March 11, for his second violation of the company's Substance Abuse and Drug Testing Policy. Hardy was also removed from the Money in the Bank ladder match at WrestleMania XXIV after the suspension was announced. Hardy returned on the May 12 edition of Raw, defeating Umaga via pinfall. This reignited the feud between the two, and they met in a Falls Count Anywhere match at One Night Stand, which Hardy won.
On June 23, 2008, Hardy was drafted from the Raw brand to the SmackDown brand, as a part of the 2008 WWE Draft. Hardy made his SmackDown debut on the July 4 edition of the show, defeating John Morrison. Hardy participated in the WWE Championship Scramble match at Unforgiven but failed to win the Championship.
In 2003, Hardy and Matt, with the help of Michael Krugman, wrote and published their autobiography The Hardy Boyz: Exist 2 Inspire. As part of WWE, Hardy has appeared in several of their DVDs, including The Hardy Boyz: Leap of Faith (2001) and WWE The Ladder Match (2007). He is also featured in the Total Nonstop Action Wrestling release Enigma: The Best of Jeff Hardy (2005) and Pro Wrestling's Ultimate Insiders: Hardy Boys - From the Backyard to the Big Time (2005). On April 29, 2008, WWE released "Twist of Fate: The Matt and Jeff Hardy Story." The DVD features footage of the brothers in OMEGA and WWE, and also briefly mentions Hardy's time in TNA. Hardy also appears on The Hardy Show, an internet web show which features the Hardys, Shannon Moore and many of their friends.
Hardy taught himself how to play guitar and later bought a drum kit. In 2003, Hardy formed a band, Peroxwhy?gen, with members of the band Burnside 6, and Moore, who later left. He also converted a trailer into a recording studio. The band recorded two songs; One song was "September Day", a song Jeff wrote in reaction to the September 11, 2001 attacks. Rumors arose that Peroxwhy?gen split up in 2004 shortly after recording the second song, "Modest", which Hardy later used as his entrance music in Total Nonstop Action Wrestling. On the official Peroxwhy?gen MySpace, however, the rumors were denounced. Currently, Peroxwhy?gen only has two members, Hardy and JR Merrill.
He has a tattoo of roots that starts on his head, behind his ear, and finishes at his hand. He also has a few other signature designed tattoos, one of which, a dragon, he hid from his father. It was also the first tattoo he got in 1998. He later got tattoos of the Chinese symbols for "Peace" and "Health", as well as tattoos of fire and a wave. Hardy regards his tattoos as his "artistic impulses". Hardy is very good friends with Shannon Moore, who he has known since around 1987. He is also good friends with Marty Garner and Jason Arhndt. He regards Vanilla Ice as a big influence on him, and he was even nicknamed "Ice" by Scott Hall.
Hardy met his girlfriend Beth Britt in 1999, shortly after the Hardy Boyz had won the WWF Tag Team Championships for the first time. Hardy and his brother Matt went to a club in Southern Pines, North Carolina, where Hardy met her. On March 15, 2008, it was reported that Hardy's house had burned to the ground in a fire. Hardy and his girlfriend were not home at the time, but his dog, Jack, was killed in the fire. It is believed that the fire was started by faulty electrical wiring. Hardy is building a new home in the same area.
On September 17, 2008, Hardy was involved in an incident at the Nashville International Airport's Southwest gate. A Southwest Airline employee reported that Hardy appeared to be intoxicated and therefore, he was not allowed to board the flight. He was not, however, arrested as he was said to be "calm" and "co-operative", and he made other arrangements to get home.