SAN FRANCISCO (KRON) – Happy National Coffee Day!

To celebrate the festivities, some of the nation’s biggest coffee sellers are offering deals, including a free cup of Joe.

For example, Krispy Kreme is offering a free iced or brewed hot coffee today, no purchase necessary! If you’re a rewards member, you can also receive a free donut.

Wendy’s is offering a free small coffee with any in-app purchase from now through Wednesday.

Panera is offering a free two-month membership today to its Unlimited Sip Club. Afterward, a membership is $10.99 per month. Anyone already signed up is eligible to get $2 off on select beverages.

Dunkin’ is giving a free medium coffee, hot or iced, with any purchase to its DD Perks members.

Peet’s, which was founded in Berkeley, is offering a complementary drip coffee with any purchase at participating locations. It is also offering 20% off beans, capsules and K-cup pods through Oct. 2 nationwide and on its website, and 20% off statewide on any other website purchase through the same date. Further there’ll be no delivery fees for orders placed on the website through that date.

“Also, free small drip coffee is offered to guests year-round when they purchase one-pound bag of beans in Coffeebars,” a spokesperson added.

Burger King is giving a free small iced coffee to anyone who orders through its app or on its website any purchase over one dollar, during breakfast hours (till 10:30 a.m. locally) at participating locations both today ant tomorrow.

And, through the end of the year, McDonald’s is offering one 99 cent iced or premium roast coffee per day with any in-app purchase.

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Now all that caffeine is something to celebrate!

UPDATE: 1:05 p.m. Sept. 29 — This story has been updated to include information about Peet’s Coffee.