How to Say "April Fools" in Japanese

エイプリルフール

eipurirufūru

“April fools” in Japanese is エイプリルフール (eipurirufūru).

The phrase refers to the custom on April 1st of playing practical jokes or fooling people.

How does it change in a sentence?

Unlike in English, the Japanese katakana version does not change its form to indicate plurality or possessive cases.

eipurirufūru

In Japan, companies sometimes participate in エイプリルフール by announcing fake products or services on their official corporate websites.
While エイプリルフール is the common term, some Japanese people refer to the day as 嘘つきの日, which translates to 'liar's day'.
In Japanese pop culture, such as in anime or manga, the concept is often used as a plot device to justify a character's sudden, inexplicable lies.

エイプリルフール！
April fools!
This example shows how to exclaim エイプリルフール.
Tatoeba #2214683 by tommy_san, translation #819813 by U2FS
今日はエイプリルフールだから嘘しか言わないことにする。
Today is April Fools, so I'm telling nothing but lies.
This example shows a sentence describing a decision to tell only lies because of エイプリルフール.
Tatoeba #3142116 by tommy_san, translation #3143717 by gustonrankin
エイプリルフールは、嘘をついてもいい日だよね。
Eipurirufūru wa, uso o tsuite mo ii hi da yo ne.
April Fools is a day when it's okay to tell lies, right?

Misaki and Kenta are talking at a cafe.

美咲 Misaki

健太くん、その話、本当？
Kenta-kun, sono hanashi, hontō?
Kenta, is that story true?
健太 Kenta

今日はエイプリルフールだから、嘘だよ。
Kyō wa Eipurirufūru dakara, uso da yo.
It's April Fools today, so it's a lie.
美咲 Misaki

あ、びっくりした！
A, bikkuri shita!
Ah, you startled me!
健太 Kenta

ごめんね、うまく騙せたかな？
Gomen ne, umaku damaseta kana?
Sorry, did I fool you well?

Sources

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