Google Translate and DeepL are fast and convenient — but the moment you handle contracts, internal documents, or HR data, the real question becomes: where does that text go? This guide breaks down the risks of free translation tools and how to choose a secure business-translation alternative for confidential documents.
Why free translation tools are a business risk
Many free services may use submitted text to improve quality or train models. Once confidential text leaves your network, you no longer control retention, access, or whether it's used for training. An employee pasting a contract in for convenience can breach your information-handling policy or an NDA.
Four things to check before trusting a tool with confidential text
- Training use — does it explicitly state your data is not used to train AI?
- Retention — when are translation logs deleted, and can you request deletion?
- Contract — can you sign a business agreement / DPA?
- Fit — is it actually built for business documents and keigo, not casual text?
Comparing the main options
| Tool | Fit for confidential docs | Notes |
|---|---|---|
| Google Translate (free) | Low | Handy, but not advised for confidential business text. Review the terms and data handling. |
| DeepL (free) | Low–Medium | High quality, but free-tier data handling needs care; use paid/business tiers for anything sensitive. |
| DeepL Pro / business | Medium–High | Does not retain your text. Strong for general translation; nuanced keigo still benefits from review. |
| Business-focused tools (BizHonyaku, YarakuZen, etc.) | High | Optimized for business docs, keigo, glossaries and review; designed for secure storage and business contracts. |
Bottom line: choose by use case
For personal research, free Google Translate or DeepL is fine. But for documents that cannot leave the company, choose a purpose-built tool with no training use, a clear retention policy, and keigo/business-tone optimization. BizHonyaku is built to handle confidential documents safely — with keigo-level selection, glossaries, and review.
Translate confidential documents safely → try BizHonyaku free