Translation guide
In Japanese, expressing 'anonymous report' depends on the context: whether it's a tip-off to authorities, a whistleblower report, a news source, or a general anonymous submission. The most common and natural expressions vary by situation.
An anonymous tip or report given to authorities or news outlets, often about a crime or scandal.
The most common and natural way to say 'anonymous report' in the sense of a tip-off to police or media. 匿名 (tokumei) means 'anonymous', 通報 (tsūhō) means 'report/tip-off'.
警察に匿名の通報があった。
There was an anonymous report to the police.
その事件は匿名の通報によって発覚した。
The incident came to light through an anonymous tip.
More formal, often used for providing information to authorities or in official contexts. 情報提供 (jōhō teikyō) means 'information provision'.
匿名の情報提供を受け付けています。
We accept anonymous reports (information).
Slangy, often used for juicy tips to media or police. タレコミ (tarekomi) implies leaking inside information.
週刊誌に匿名のタレコミがあったらしい。
Apparently there was an anonymous tip-off to the weekly magazine.
An anonymous report made within an organization to expose wrongdoing, often through a formal system.
Specifically refers to an internal whistleblower report. 内部通報 (naibu tsūhō) is the standard term for whistleblowing within a company or organization.
匿名の内部通報制度を導入した。
We introduced an anonymous whistleblowing system.
不正は匿名の内部通報で明るみに出た。
The misconduct came to light through an anonymous internal report.
Stronger term implying accusation or exposure of wrongdoing. 告発 (kokuhatsu) can mean 'indictment' or 'accusation', often used in legal or serious contexts.
匿名の告発文がマスコミに送られた。
An anonymous letter of accusation was sent to the media.
Information provided to journalists by an unnamed source.
Standard term for an anonymous source in journalism. 情報源 (jōhōgen) means 'information source'.
その記事は匿名の情報源に基づいている。
The article is based on an anonymous source.
Used for a leak of information, often from within an organization. リーク (rīku) is a loanword from English 'leak'.
政府高官からの匿名のリークがあった。
There was an anonymous leak from a senior government official.
A report, comment, or piece of content submitted without revealing identity, such as in surveys, contests, or online.
General term for anonymous posting or submission, especially online or in writing. 投稿 (tōkō) means 'contribution/submission'.
匿名の投稿が掲示板にあった。
There was an anonymous post on the bulletin board.
アンケートは匿名の投稿が可能です。
Anonymous submissions are possible for the survey.
A more direct translation, but can sound stiff. 報告 (hōkoku) means 'report'. Use in formal contexts like business or official reports.
匿名の報告書が提出された。
An anonymous report was submitted.
Simply saying 「匿名のレポート」 (tokumei no repōto) is not natural for most contexts. It sounds like a school report or document that happens to be anonymous, not a tip-off or whistleblower report. Use the context-appropriate phrases above.
The word 匿名 (tokumei) can be attached directly to many nouns to mean 'anonymous X', e.g., 匿名希望 (tokumei kibō, 'wishing to remain anonymous'), 匿名組合 (tokumei kumiai, 'anonymous partnership'). However, for 'report', the phrase 匿名の〜 is more common.