Privacy Policy

Last updated: 7 August 2026

Danmaku Translator is a browser extension that translates danmaku and comments on bilibili.com. This policy explains exactly what data passes through our service and what does not. It applies to the extension and to translate.danmaku.app.

What we collect

• The text to be translated. The danmaku and comment text on the Bilibili page you are viewing is sent to our translation service and returned translated. Translations are cached so that popular videos do not need re-translating; cached translations are stored by the text itself and are not linked to the person who requested them.
• Your email address — only if you choose to sign in with Google. It links your account to your plan and daily allowance. We receive your email and a Google account identifier; we never receive or handle your Google password.
• A random device identifier — only if you do not sign in. It is generated on your device and exists solely to count your free daily translations. It is not derived from your hardware, your IP address, or any browser fingerprint.
• A session token issued by us after sign-in, stored on your device and sent back to identify you on subsequent requests.

What we do not collect

• We do not collect your browsing history, the URLs you visit, or which videos you watch.
• We do not collect your name, address, phone number, or location.
• We never see your payment card details — Stripe handles all payments.
• We do not record clicks, keystrokes, scrolling, or mouse movement.
• We do not build advertising profiles, run ads, or sell or rent data to anyone.
• The extension runs only on bilibili.com and does not track you on any other website.

Who else sees this data

Translation is performed by DeepSeek, an AI model provider, which receives only the text to be translated and no information about who sent it. Payments are processed by Stripe, which receives your email and payment details directly — those details never pass through our systems. Our service runs on Cloudflare infrastructure. We do not share data with anyone else.

How long we keep it

Cached translations expire after 60 days. Daily usage counters are kept per day and are not tied to any content you translated. Account records are kept while your account exists.

Your choices

You can use the extension without an account. You can turn danmaku or comment translation off at any time from the toolbar popup. You can sign out, which removes the session from your device. To delete your account and its associated data, email support@danmaku.app and we will remove it within 30 days.

Children

Danmaku Translator is not directed at children under 13, and we do not knowingly collect data from them.

Changes

If this policy changes materially, we will update the date above and note the change on the extension's store listing.