Yes. LINE runs free official interpreter accounts, and they are genuinely good at what they do. But LINE only documents four of them, every documented one pairs Japanese with one other language — English, Korean, Simplified Chinese or Traditional Chinese — and each account handles that one pair and nothing else.
So if your chat is Japanese and one other language, use LINE's own account: it is free and it is made by LINE. If your chat is anything else, or more than two languages, the official accounts are not the answer people usually assume they are.
These are listed on LINE's own user guide. Add one as a friend, or invite it into a group, and it translates between its two languages:
| Account | Translates between |
|---|---|
| @linejpen | Japanese and English |
| @linejpkr | Japanese and Korean |
| @linejpcn | Japanese and Simplified Chinese |
| @linejptcn | Japanese and Traditional Chinese |
Source: LINE's official usage guide. Note its own timestamp — the page was last updated in March 2022.
This is where most advice goes wrong, in both directions.
Older guides — mostly Taiwanese blog posts from around 2019 — list a second family of official accounts for pairs that do not involve Japanese at all, including Chinese and English. Those accounts do appear to still exist. But LINE does not list them on any current documentation page we could find, at least one account from those old lists has since disappeared, and an account existing is not the same as an account still answering. We are not going to reprint handles we cannot confirm are maintained, and we would be careful about any page that does.
The other common error runs the opposite way: being told to add @linejpen or @linejpcn for a chat with no Japanese in it. Those accounts translate Japanese and one other language. A Taiwanese team working in Chinese and English gets nothing useful from either.
For Thai specifically: there is no documented official Japanese–Thai interpreter account. If you were given a handle for one, check it before you rely on it.
Each interpreter account does one pair. The obvious workaround — add the Japanese–English one and the Japanese–Korean one to the same group — does not work, and not because of anything to do with translation. LINE's platform rules do not allow two Official Accounts in the same group chat at all.
That rule applies to every bot on LINE, ours included, and it is the single most important thing to understand before planning a multilingual group. Here is what it means in practice.
PlumiBot is one of those. It carries as many of 126 languages as a chat needs at the same time rather than one pair, so a group reading Chinese, Vietnamese and English gets all three from one message. The alternatives, compared honestly.
PlumiBot