From 1990 to 2019, the NFL playoffs included 6 teams in each conference. Here are the list of best regular season records2 for each team:
- #1 Seed record: 16-0 by 2007 New England Patriots 16-0
- #2 Seed record: 14-2 by 1998 Atlanta Falcons & 2004 New England Patriots
- #3 Seed record: 13-3 by 2011 San Francisco 49ers & 2019 San Francisco 49ers & 1999 Tennessee Titans
- #4 Seed record: 12-4 by 2006 Indianapolis Colts & 2004 San Diego Chargers & 2001 San Francisco 49ers & 2003 Tennessee Titans
- #5 Seed record: 11-5 by 2014 Arizona Cardinals & 2005 Carolina Panthers & 2000 Denver Broncos & 2009 Green Bay Packers & 2013 Kansas City Chiefs & 2017 Los Angeles Rams & 1992 Minnesota Vikings & 2008 New England Patriot & 1991 New Orleans Saints & 2001 Philadelphia Eagles & 2005 Pittsburgh Steelers
- #6 Seed record: 11-5 by 2008 Baltimore Ravens
Worst records2:
- #1 Seed record: 11-5 by 1992 Miami Dolphins & 2002 Tennessee Titans
- #2 Seed record: 10-6 by 2006 Philadelphia Eagles
- #3 Seed record: 10-6 by 1995 Buffalo Bills & 1996 Buffalo Bills & 1993 Detroit Lions & 2004 Green Bay Packers & 2017 Jacksonville Jaguars & 1994 Minnesota Vikings & 2009 New England Patriots & 2006 New Orleans Saints & 2007 ,New York Giants & 1999 Washington Redskins
- #4 Seed record: 9-7 by 2006 Dallas Cowboys & 1995 Indianapolis Colts & 1994 New York Giant & 2004 Seattle Seahawks
- #5 Seed record: 8-8 by 1999 Dallas Cowboys & 2004 Minnesota Vikings
- #6 Seed record: 8-8 by 1990 New Orleans Saints & 1991 New York Jets & 1999 Detroit Lions & 2004 New Orleans Saint & 2006 New York Giants
Notes:
- Will add links to each team's record listed above
- Some of the answer may be slightly wrong as my program doesn't seeds teams based purely on record, and doesn't take into account that divisions winners are no lower than the 4th seed. For example 2010 Seattle Seahwaks at 7-9 were a 4th seed. I will fix the code and update the answer.
In terms of playoffs, the best appearance for each seed is a Super Bowl:
- #1 Seed: Super Bowl Champions, ex 2015-16 Denver Broncos
- #2 Seed: Super Bowl Champions, ex 2018-19 New England Patriots
- #3 Seed: Super Bowl Champions, ex 2006-07 Indianapolis Colts
- #4 Seed: Super Bowl Champions, ex 2012-13 San Francisco 49ers
- #5 Seed: Super Bowl Champions, ex 2007-08 New York Giants
- #6 Seed: Super Bowl Champions, ex 2010-11 Green Bay Packers
And when it comes to worst playoffs performances, all seeds have lost on the first round of their games.