FyDub X TranslatorLast updated: September 8, 2026
FyDub ("we", "our", or "us") is a browser extension for Chrome and Firefox that translates video audio on x.com in real time using AI-generated dubbing. This Privacy Policy explains what information we collect, how we use it, and your rights.
1. Information We Collect
Fydub collects only the minimum data necessary to provide its service:
- x.com Video Identifier — the public identifier associated with the video you choose to translate. It is used only to access and process the selected video's public media required to provide the translation service.
- Selected Language — the target language you choose for translation.
- Anonymous Device Identifier (device_id) — a randomly generated identifier stored locally in your browser using the extension's local storage API and in our database. It is not linked to your identity and is used solely to enforce usage limits and restore Premium access.
- Technical Recovery Cookie (xtranslator_did) — a secure, HttpOnly cookie set by our server. It contains only your anonymous device_id and allows continuity of usage limits and Premium access across extension reinstalls within the same browser profile.
- Anonymous Usage Counters — the number of seconds of translation used per day and per month, associated only with your device_id.
We do not collect your name, personal identity, browsing history, or X account credentials. We do not actively collect or store IP addresses for identification purposes.
2. How We Use Your Information
The x.com video identifier, selected language, and public media required for the selected video are processed by our server exclusively to:
- Access the public media and, when available, captions required for the selected video
- Transcribe and translate the video audio when needed, and generate translated speech using text-to-speech
- Return the translated audio to your browser
This data is processed in real time and is not stored after the request is completed.
The anonymous device_id is also sent with each request to:
- Enforce free-tier limits (15 minutes/month + 3 minutes/day)
- Verify Premium access
- Enable account recovery
3. Third-Party Services
Fydub uses the following third-party services to operate:
- X Public Media Data — public media and, when available, caption resources associated with the selected video are accessed only to provide the translation service. We do not access your X account credentials or private account data.
- Microsoft Edge TTS — text-to-speech audio generation. Only the translated text needed to generate speech is sent; no X account credentials or other personal information are included.
- Google Cloud Run & Firestore — our backend infrastructure and database. The anonymous device_id and usage counters are stored here. Requests are not logged beyond standard infrastructure metrics.
- Stripe — payment processing for Premium plans. Stripe handles all payment information. We receive only the email address used at checkout, solely for account recovery purposes.
4. Data Retention
Fydub does not store:
- Video IDs
- Caption or transcribed text
- Generated audio
However, we do store limited non-personal data in our secure database (Google Cloud Firestore), including:
- Anonymous device_id
- Usage counters (daily and monthly)
- Email address (only for Premium users, for account recovery)
This data is used strictly to provide the service and is never sold or shared for advertising purposes.
5. Cookies and Local Storage
Fydub does not use advertising cookies, tracking cookies, analytics tools, or behavioral tracking.
However, we use:
- Local extension storage — to store preferences (language, voice, volume) and your device_id
- A strictly necessary technical cookie (
xtranslator_did) — used only to maintain your anonymous identifier and ensure continuity of service
We do not track you across websites.
6. x.com Page Modification
Fydub modifies the x.com interface locally in your browser to provide its functionality. This includes:
- Injecting a "Translate Video" button
- Synchronizing AI-generated audio with video playback
- Adjusting original video volume
These modifications occur only on your device and do not affect X servers, other users, or your account.
7. Children's Privacy
Fydub is not directed at children under 13 and does not knowingly collect personal data from children.
8. Premium Accounts & Email
If you purchase a Premium plan, your payment email (provided via Stripe) is stored securely only to:
- Restore Premium access
- Handle account recovery
This email is:
- Never used for marketing
- Never shared with third parties
- Only accessed when necessary for support
You may request deletion of your data at any time.
9. Changes to This Policy
We may update this Privacy Policy from time to time. Changes will be reflected on this page with an updated date. Continued use of the extension constitutes acceptance.
10. Contact
If you have any questions about this Privacy Policy, contact us at: fydub.app@gmail.com