On Yom Kippur, people usually avoid saying “Happy Yom Kippur” and instead use greetings that match the day’s solemn, reflective tone.

Most common simple phrases

If you just want something short and appropriate, you can say:

  • “Have an easy fast.”
  • “Have a meaningful fast.”
  • “Have a meaningful Yom Kippur.”
  • “Have a good holy day.”

These work well in person, by text, or email, especially if you are not Jewish but want to be respectful.

Traditional Hebrew / Yiddish greetings

Here are the classic phrases many Jews use with each other around Yom Kippur:

  • Gmar Chatima Tova (גמר חתימה טובה) – “A good final sealing,” referring to being sealed in the Book of Life for a good year.
  • Gmar Tov – A shorter version meaning “a good end” (to the period of judgment / the year).
  • Tzom Kal (צום קל) – “Have an easy fast.”
  • Yom Tov or Gut Yontif (Yiddish) – “Good holy day.”
  • Shana Tova – “Good year / Happy New Year,” still used because Yom Kippur comes right after Rosh Hashanah.

What not to say

Because Yom Kippur is a day of fasting, repentance, and serious reflection, “Happy Yom Kippur” or “Merry Yom Kippur” generally feels off to many observers.

If you’re unsure, “Have a meaningful fast” or “Gmar Chatima Tova” is almost always safe and appreciated.

TL;DR:
Say things like “Have an easy fast,” “Have a meaningful Yom Kippur,” or “Gmar Chatima Tova” rather than “Happy Yom Kippur.”