Privacy Policy

Last updated: August 9, 2026

VietPhrase (vietphrase.app) is a free Chinese-Vietnamese translation tool available as a web app and a Chrome extension. Việt Phrase, Hán Việt, and Mặc Hi translation run on your device. Google + Term is an optional online mode.

Data We Collect

We do not intentionally collect or store your translation content on our servers. Dictionaries, books, reading progress, and saved translations are stored locally on your device using IndexedDB and localStorage. When you explicitly choose Google + Term, protected text chunks are sent directly from your browser to Google for translation; the VietPhrase server does not relay or store those chunks.

Google Drive Integration

If you choose to enable Cloud Sync, the app requests access to Google Drive's app-specific folder (drive.appdata scope). This allows the app to:

Store and retrieve your sync data (books, reading progress, settings, custom phrases) in a hidden app folder on your Google Drive
This folder is only accessible by VietPhrase and is not visible in your Drive

We do not access, read, or modify any other files in your Google Drive. The access token is stored locally on your device and is never sent to any third-party server.

Chrome Extension

The VietPhrase Chrome extension translates Chinese text on any website you visit. The following applies specifically to the extension:

Host permissions (<all_urls>) — The extension requires access to all websites to inject a content script that detects and translates Chinese text. It does not collect, read, or transmit any personal data or page content beyond the Chinese text segments being translated.
Offline mode — In Offline mode, all translation happens locally on your device using imported dictionaries. No network requests are made.
API / Hybrid mode — In these modes, Chinese text segments are sent to the configured translation server (sangtacviet.com and variants) for translation. No user identifiers, cookies, or personal data are attached to these requests.
Sample dictionaries — When you import sample dictionaries, files are downloaded from vietphrase.pages.dev (Cloudflare Pages). No user data is sent during this process.
Local storage — Dictionary data, custom phrases, and preferences are stored locally using IndexedDB and chrome.storage.local. Nothing is synced externally unless you explicitly use cloud sync features in the web app.

Third-Party Services

Google Identity Services — used solely for OAuth authentication when you enable Cloud Sync (web app only)
Google Fonts — font files are loaded from Google's CDN
Google Translate services — used only when you choose Google + Term. The current Chinese text chunks, including any content you entered, are sent directly from your browser to Google with credentials omitted; no VietPhrase account identifier, Google cookie, or dictionary is attached
Translation servers (sangtacviet.com and variants) — used in API and Hybrid mode to translate text. Only Chinese text segments are sent; no personal data is included
Cloudflare Pages (vietphrase.pages.dev) — hosts the web app and sample dictionary files

Data Storage

All app data is stored locally in your browser:

Dictionaries and custom phrases — IndexedDB
Books and reading progress — IndexedDB
Settings and preferences — localStorage

You can delete all data at any time by clearing your browser's site data for this domain.

Contact

If you have questions about this privacy policy, please contact us at dan@vietphrase.app.