What is a traditional Eid greeting?

[Azquilith]

I have a friend celebrating Eid who described today as 'his Christmas Day'. What's a traditional Eid greeting ala 'Happy Christmas'?

Eid Mubarak

Eid Mubarak, I believe

Thanks!

Eid mubarak is indeed the most common one I heard in the UK but just for fun "kol 'am w antum bekheir" is also used a lot by arabic speaking muslims and is much more common here in Egypt, where for some reason I have never heard eid mubarak used. It means roughly a wish that each year finds the recipient well, it literally says "every year and you are well"