Translation guide
The English word 'user' can refer to a person who uses a product, service, or substance, or in computing, someone operating a system. Japanese has distinct terms for these contexts, and the most natural choice depends on what is being used.
To refer to a customer, consumer, or end-user of a product, service, or facility.
General term for a person who uses a service, facility, or system. Common in contexts like public transport, libraries, or online services.
The number of users of this library is increasing every year.
We will improve our services by listening to user feedback.
Loanword from English, widely used in tech and business for software, apps, or online platforms. Less formal than 利用者.
This app has users all over the world.
Refers to someone who operates or uses a device, tool, or machine. Often found in manuals or legal contexts.
Users of this machine must read the manual.
To refer to someone logged into a computer, network, or software, often with an account.
To refer to someone who consumes or is addicted to drugs, alcohol, or tobacco.
To distinguish the final consumer from the creator or distributor.
利用者 is the safest general term for a person using a service or facility. ユーザー is best for software and tech, and sounds more modern. 使用者 is for operating tools/machines or substance use. Avoid using 使用者 for service users, as it can sound overly technical or legal.
Library user → OK, Library user (ユーザー) → unnatural
In Japanese, ユーザー is not used for substance users. Use 使用者 or 常用者 instead. Using ユーザー in that context would be confusing or sound like a mistranslation.
This system can be used by multiple users at the same time.
利用者が増えるとサーバーに負荷がかかります。
When the number of users increases, it puts a load on the server.
彼は長年の麻薬常用者だ。
He is a long-term drug user.
The end user of this product is limited to individuals.