Ways to Say "Thank You" in Korean

The everyday standard is 감사합니다 (gamsahamnida), which is polite and safe in almost any situation. Between close friends, and for warmer, softer thanks, Korean speakers switch to 고마워 or 고마워요.

The most common way

gamsahamnida

A polite, all-purpose "thank you" — neutral in tone and appropriate with strangers, colleagues, staff and elders.

How to say it: The 합니다 ending is not said with a real "h" plus "b": the ㅂ becomes an "m" sound, so it comes out close to "gam-sa-ham-ni-da" with even stress on each syllable.

Other ways to say it

polite casual
gomawoyo
A warm, friendly thank you — softer and less formal than 감사합니다, and the usual choice in everyday polite speech.
When to use it: Say it to acquaintances, coworkers you're close to, neighbours or anyone you speak to in polite informal style.
casual
gomawo
Plain, direct thanks between people who are close; it is warm, not rude, but only inside that circle.
When to use it: Use it with close friends, a partner, or someone clearly younger than you.
warm polite
gomapseumnida
Standard polite thanks with a slightly warmer, more personal feel than 감사합니다.
When to use it: Good with people you see regularly and want to thank sincerely — a teacher, a kind stranger, an older colleague.
very formal / humble
gamsadeurimnida
A formal, self-lowering thank you that puts the listener above you; it sounds official and respectful.
When to use it: Use it in public speeches, emails to clients, or when thanking a superior or someone who did you a big favour.
emphatic

jeongmal gamsahamnida
"Thank you so much" — the standard phrase plus an intensifier for genuine, heartfelt gratitude.
When to use it: Say it when the help was considerable or you want the other person to feel how grateful you are.

In a conversation

A
? !
igeo je seonmurieyo? gomawoyo!
Is this a present for me? Thank you!
B
. .
byeolgeo anieyo. saengil chukhahaeyo.
It's nothing. Happy birthday.
A
. .
jeongmal gamsahamnida. jal sseulgeyo.
Thank you so much. I'll use it well.

Common mistakes

~~감사함니다~~ → 감사합니다
The ending is 합니다, not 함니다 — the ㅂ is spelled ㅂ even though it sounds like an "m".
~~선생님, 고마워.~~ → 선생님, 고마워요. / 선생님, 감사합니다.
고마워 is plain casual speech and sounds disrespectful to a teacher or anyone older; add 요 or use the polite form.
~~천만에요.~~ → 별말씀을요. / 아니에요, 뭘요.
천만에요 is a textbook reply to thanks that Koreans almost never say; it sounds stiff and dated.