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Guest access, credits, and API keys

By LangBox

Compare the guest trial, the free signed-in account allowance, and custom API keys (BYOK) where supported before translating long pages or files.

Allowance rules and security limits

  • Guests receive a one-time 2,000,000-token trial; signed-in accounts receive 10,000,000 tokens valid for 30 days (unused tokens do not roll over).
  • PDF translation requires signing in; EPUB translation can start as a guest; custom API keys (BYOK) apply only where offered in the Chrome extension and do not feed learning capture.
  • Extension API keys are stored in local browser storage without a promise of encrypted storage, and requests send text to your chosen model provider.

How to manage your credits and keys safely

  1. Pick the right access method for the tool

    Use the guest trial for quick tests or EPUBs, sign in for PDF translation and the 30-day 10M-token allowance, or use an API key in the extension.

  2. Check the Models panel before translating

    Open extension settings to view eligible models and your remaining token balance, noting that different models use tokens at different rates.

  3. Keep your API keys and sensitive text private

    Never share API keys in screenshots or emails, avoid sending confidential text not permitted by your provider, and revoke exposed keys immediately.