The Giants entered the NFL draft owning 12 picks, a total general manager Dave Gettleman called “crazy.’’ He had no intention of using them all. As it turned out, the Giants made 10 selections, as Gettleman traded away picks in the fourth and fifth rounds and swapped his second-round pick (37th overall) with the Seahawks to move into the first round to take Georgia cornerback Deandre Baker at No. 30.

Adding 10 players in a single draft is unusual, but that did not end the work to be done. The Giants concluded their draft and swung immediately into filling out the back end of their roster by signing targeted undrafted free agents.

The Giants entered the draft with 67 players under contract and the 10 draft picks put them at 77, leaving 13 spots open. Rather than find and sign 13 players who went undrafted to add, Gettleman said he planned on signing “just a half-dozen guys’’ and then wait to see what unfolds the rest of the spring and into the summer before reaching the 90-player limit.

“I’m not in a rush to get to 90,’’ Gettleman said. “In an ideal world you want 90 guys that belong in a camp. So we’re — upstairs those guys know, if he doesn’t belong in a camp, we’ll wait. We’ve got rookie minicamp coming in, we’ll have tryout guys, rookie minicamp next weekend. There will be guys there on tryouts.’’

• Giants’ NFL Draft tracker: Live round-by-round picks and analysis

The 10 draft picks will attend a rookie minicamp Friday, Saturday and Sunday, with plenty of unsigned rookies also invited.

As it turns out, the Giants intend to sign nearly a dozen players. According to social media reports — often from the player himself — the Giants will sign these undrafted free agents:

Running back Jonathan Hillman (Rutgers), defensive lineman Jeremiah Harris (Eastern Michigan), receiver Reggie White Jr. (Monmouth, N.J.), linebacker Josiah Tauaefa (University of Texas-San Antonio), defensive back Jake Carlock (LIU-Post), tackle Paul Adams (Missouri), S Jacob Thieneman (Purdue), safety Mark McLaurin (Mississippi State) and center James O’Hagan (Buffalo), WR Alex Wesley (Northern Colorado) and TE C.J. Conrad (Kentucky).