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How does two-way chat translation work?

What agents and visitors each see, which languages are supported, and what happens when a translation fails.

Live chat1 min readLast updated Oct 28, 2026TapCub teamPart of Two-way translation and AI replies

Short answer

With two-way translation on, a visitor’s message shows the original plus a translation into the agent’s language, and the agent’s reply reaches the visitor translated into theirs — the visitor sees only the translation. Internal notes are never sent or translated.

What each side sees

Open Live chatChat settingsGreeting & translation and turn on Two-way automatic translation. From then on:

  • A visitor’s message appears as the original plus a translation into the agent target language. “Auto” uses the agent’s browser language.
  • An agent’s reply is translated into the visitor’s language, and the visitor sees only the translation.
  • Internal notes are never sent to the visitor and are not translated.

Supported languages include Simplified and Traditional Chinese, English, Japanese, Korean, German, French, Spanish, Portuguese, Russian, Arabic, Italian, Thai, Vietnamese, Indonesian, Turkish, Dutch and Polish.

The Interface language setting is different: it only picks Chinese or English for the bubble’s buttons and never rewrites messages. Translation needs the Pro chat plan.

When a translation fails

Translation runs while the message is sent, with a budget of about 3 seconds. If it fails, the message still goes out in the words the agent typed, and the inbox shows “translation failed, original sent”. With automatic translation off, an agent can still translate a single message from the inbox on demand.

Translation and AI replies share one monthly budget of AI calls — see how AI calls are counted.

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