How to Say “Oh Hi” in Japanese

あ、こんにちは
a, konnichiwa
In Japanese, the phrase for "oh hi" is あ、こんにちは (a, konnichiwa).
あ、こんにちは is a casual greeting used when you unexpectedly encounter someone. The addition of the あ at the beginning makes the greeting feel spontaneous and casual, as if you just noticed the person.

Which one should you use?

A more casual alternative to あ、こんにちは is あ、どうも, which is often used among acquaintances or in very relaxed settings. For a standard morning greeting, use おはようございます。 For a very informal greeting among friends, you can use おっす! or the abbreviation こんちゃ!

Is there a formal and an informal way to say it?

あ、こんにちは is an informal way to greet someone. While こんにちは is standard, the あ prefix makes the greeting feel more spontaneous and casual, as if you just noticed the person. In contrast, おはようございます。 is a formal greeting in the morning meaning Good morning.

How do you pronounce it?

a, konnichiwa

Did you know?

  • The word こんにちは is actually a contraction of a much longer, older greeting that meant 'Regarding the day…'. The full sentence originally ended with a wish for the person's well-being.
  • While こんにちは is the standard 'good afternoon', if you use it after sunset, it can sound strange or even humorous. In those cases, you would traditionally switch to こんばんは.
  • In Japan, a small nod or a slight bow often accompanies the あ in あ、こんにちは to physically signal the sudden recognition of the other person.

Examples in context

  • おっす、元気?
    Hey, how are you doing?
  • こんちゃ!暇?
    Hi! Are you free?
  • あ、こんにちは。
    A, konnichiwa.
    Oh, hi.
  • あ、こんにちは、久しぶり!
    A, konnichiwa, hisashiburi!
    Oh, hi, long time no see!
  • あ、こんにちは、どこに行くの?
    A, konnichiwa, doko ni iku no?
    Oh, hi, where are you going?

Example conversation

Ren bumps into Yui at a local convenience store.

  1. 蓮 Ren

    あ、こんにちは、結衣さん。
    A, konnichiwa, Yui-san.
    Oh, hi, Yui.
  2. 結衣 Yui

    あ、蓮くん、こんにちは!
    A, Ren-kun, konnichiwa!
    Oh, hi, Ren!
  3. 蓮 Ren

    買い物中?
    Kaimono chuu?
    Are you shopping?
  4. 結衣 Yui

    うん、ちょっとね。
    Un, chotto ne.
    Yeah, just a little bit.
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Dean Ray
Dean RayHelp make this guide better. Spot a mistake, know another way to say it, or have an example from real life? Share it below.
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