Over the course of a comedy career of 36 years and counting and 9 seasons of a singularly influential sitcom, Jerry Seinfeld has built a vast repository of stand-up material but was never truly master of his domain, in the online sense.

That will change on Friday with the debut of his Web site, JerrySeinfeld.com, an online home for video of nearly every recorded comedy performance given by its creator and namesake, who at 57 is hardly in his autumn years but is contemplating posterity.

“I really thought, ‘Where’s my stuff going to be when I’m dead?’ ” Mr. Seinfeld said Tuesday in an interview. “Is it just gone for all time? Who could sift through it? I thought, I should filter this out and be the judge of what I thought was good.”

For the site Mr. Seinfeld has opened his vault and come back with more than 1,000 clips of his stand-up act and comedic interviews. One segment dates to 1977, when Mr. Seinfeld, wearing glasses and wide lapels and speaking with a distinct Noo Yawk accent, made his television debut on “Celebrity Cabaret.” The others range from his first network television appearance, on a 1981 broadcast of “The Tonight Show Starring Johnny Carson,” (an occasion whose 30th anniversary coincides with the site’s opening day) to the present.