From 1990 to 2019, the NFL playoffs included 6 teams infrom each conference. Note that in 2020 the league expanded playoffplayoffs teams from 6 to 7 in each conference, so this answer doesn't include any teamteams from the 2020-21 season onwards.
Here are the list of best regular season records for each team:
- #1 Seed record: 16-0 by
- 2007 New England Patriots 16-0
- #2 Seed record: 14-2 by
- #3 Seed record: 13-3 by
- #4 Seed record: 13-3 by
- 1999 Tennessee Titans
- #5 Seed record: 12-4 by
- #6 Seed record: 11-5 by
Worst regular season records:
- #1 Seed record: 11-5 by
- #2 Seed record: 10-6 by
- #3 Seed record: 9-7 by
- #4 Seed record: 7-9 by
- 2010 Seattle Seahawks
- #5 Seed record: 8-8 by
- #6 Seed record: 8-8 by
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 Baltimore Ravens
- #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.