Quick answer: which phrase depends on what you are replying to
“No problem” in English does two jobs. It accepts a request — “can you help me?” — and it dismisses an apology — “sorry I am late.” Chinese uses separate phrases for these, and choosing the wrong one is noticeable.
没问题 (méi wèntí) literally means “no question” or “no issue”, and it accepts a request or confirms something is possible. 没关系 (méi guānxi) literally means “it has no connection”, and it dismisses an apology by saying the matter does not affect the relationship. 没事 (méishì) means “it is nothing”, and it works for both, in a casual register.
| Chinese | Pinyin | Literal sense | Reply to |
|---|---|---|---|
| 没问题 | méi wèntí | No issue | A request, or a question about feasibility |
| 没关系 | méi guānxi | No connection | An apology |
| 没事 | méishì | It is nothing | Apology or a request, casual |
| 没事儿 | méishìr | It is nothing | Same, with the northern 儿 ending |
| 不客气 | bú kèqi | Do not be polite | Thanks |
| 不用谢 | búyòng xiè | No need to thank | Thanks |
没问题 accepts a request
没问题 is the phrase for agreeing to do something, and it is the closest match to English “no problem” in the agreeing sense. 帮我一下，可以吗？(Can you help me?) answered with 没问题 means yes, that is fine. It also answers questions about whether something is possible: 明天能到吗？没问题.
It sits in a neutral-to-friendly register and works in both personal and professional contexts. For a more formal agreement, 当然可以 (of course) or 好的 (all right) may fit better in writing.
没关系 answers an apology
没关系 is what you say when someone apologises. It means the matter does not damage anything between you, which is why it belongs with apologies rather than requests. If someone says 对不起 (duìbuqǐ, sorry), 没关系 is the standard reply.
For a small everyday inconvenience, Chinese often softens it further: 没事没事 (“it is nothing, really”) or 没关系的. For a serious harm, 没关系 can sound dismissive, and a more substantial reply is expected.
没事 is the all-purpose casual form
没事 is very common in speech and covers both uses. It can mean “it is nothing” as an apology reply, “it is fine” as reassurance, and “nothing is wrong” when someone asks whether something is bothering you. Context and tone do the work.
The 儿-ending version 没事儿 belongs to northern speech, particularly Beijing, and sounds more colloquial. Neither version belongs in formal writing.
Why 不客气 is not the same as “no problem”
Where English speakers often say “no problem” after being thanked, Chinese uses 不客气 (bú kèqi) or 不用谢 (búyòng xiè). 不客气 is the standard, slightly formal reply to thanks. 不用谢 is lighter. Using 没关系 after thanks would answer the wrong question, in the way that replying “don’t worry about it” to “thank you” sounds slightly off in English.
What it does not mean
没问题 is not a promise of quality or a guarantee — it confirms the task or the plan, not the outcome. 没关系 does not mean “I forgive you” in a formal sense; that would be closer to 我原谅你. 没事 does not mean “I am fine” in every context, and it should not be used to dismiss something serious.
Common mistakes
- Replying 没问题 to an apology where 没关系 belongs.
- Replying 没关系 to a request; that answers a question nobody asked.
- Using 不客气 as a reply to an apology.
- Using 没事 for a serious harm, where it sounds dismissive.
- Mixing 没事 with 不客气 in formal writing.