In an unusual nod to the popularity of free music online, the rock act Nine Inch Nails is offering its new album, “The Slip,” through its Web site  for nothing.

In a post on the band’s Web site, www.nin.com, the band’s leader, Trent Reznor, said, “Thank you for your continued and loyal support over the years  this one’s on me.”

The album, which became available for download just after 3 a.m. Eastern time on Monday, appears to represent the first time a superstar act has distributed an entire album without any opportunity for people to pay for it. Its release comes two months after the band issued the instrumental album “Ghosts I-IV” and allowed fans to obtain a portion of it for free or the entire recording for $5. Before that, the British rock act Radiohead broke with convention by offering its 2007 album, “In Rainbows,” online under a tip-jar-style setup in which people could name their own price  including zero.

Mr. Reznor’s new offer could serve as another test of how the easy availability of free music online affects subsequent CD sales and other money-making opportunities. “The Slip” will not be sold on CD or vinyl until at least July, according to representatives for the band. But the free digital version could stoke interest for Nine Inch Nails’ recently announced concert tour. Already, radio stations have shown interest in “Discipline,” a song from “The Slip” that was released about two weeks ago.