# SublyAI - AI Subtitle Generator

> SublyAI is a free AI-powered video subtitle generator and translator: automatic subtitles in 50+ languages, burn-in export, and privacy-first client-side processing (your video never leaves the device).

SublyAI uses Google Gemini AI for speech recognition and translation. Unlike cloud-based tools like VEED or Kapwing, SublyAI processes videos locally in the user's browser - video files never leave the device.

Key differentiators:

1. **Client-Side Processing**: Video is processed locally using WebCodecs API. Only extracted audio is sent to AI, ensuring maximum privacy.
2. **Two-Phase AI Processing**: Phase 1 Deepgram transcription with word-level timestamp precision, Phase 2 Google Gemini translation and final refinement.
3. **50+ Languages**: Automatic translation to 50+ languages including English, Czech, German, French, Spanish, Italian, Polish, Russian, Chinese, Japanese, Korean, Portuguese, Dutch.
4. **Free Tier**: 15 minutes of AI processing free on registration. No credit card required.

Technical stack: Google Gemini (Vertex AI) for translation/refinement, Deepgram for transcription, client-side processing via WebCodecs API, SSL/TLS encryption and ephemeral storage (auto-deleted after processing).

Supported formats: input video MP4, MOV, AVI, WebM; subtitle import/export SRT, VTT; burn-in (hardcoded) subtitles.

Typical use cases: content creators needing fast subtitle generation, multilingual video translation, privacy-conscious users, YouTubers, marketers, educators.

Comparison with alternatives:

| Feature | SublyAI | VEED | Kapwing |
|---------|---------|------|---------|
| Processing | Client-side | Cloud | Cloud |
| Privacy | Video never leaves device | Uploaded to cloud | Uploaded to cloud |
| Price | 15 min FREE on registration | Paid from $12/mo | Freemium w/ watermark |
| Timestamp Accuracy | Word-level | Sentence-level | Sentence-level |
| Own Subtitle Import | Free, no credits | Limited | Limited |

FAQ:

- **What is an AI video translator?** An AI video translator automatically transcribes speech from your video, translates it to your chosen language, and generates subtitles or burned-in captions. SublyAI uses Google Gemini AI and processes everything in your browser.
- **What AI model does SublyAI use?** Deepgram for transcription (word-level accuracy) and Google Gemini (Vertex AI) for translation and refinement. A two-phase approach ensures precise timing and high-quality language output.
- **Is it free?** Yes. 15 minutes of AI processing free on registration, no credit card required.
- **Does SublyAI store my videos?** No. Video files are processed locally in your browser. Only extracted audio is temporarily sent to Google Cloud for AI analysis and automatically deleted after completion.
- **What languages are supported?** Translation to 50+ languages including English, Czech, German, French, Spanish, Italian, Polish, Russian, Chinese, Japanese, Korean, Portuguese, Dutch.
- **Can I use my own subtitles?** Yes, upload your own SRT or VTT file and perform burn-in for free. This feature does not deduct any minutes.

## Key Pages

- [Landing page](https://sublyai.ai22.tech): Hero section, feature grid, pricing calculator, FAQ
- [AI Video Translator](https://sublyai.ai22.tech/ai): Two-phase AI processing explanation, technical architecture
- [User Manual](https://sublyai.ai22.tech/manual): How to use the app, features and settings
- [Blog](https://sublyai.ai22.tech/blog): Guides on subtitle workflows, formats and privacy
- [Terms of Service](https://sublyai.ai22.tech/terms): Usage terms, limitations, payment terms, liability
- [Privacy Policy](https://sublyai.ai22.tech/privacy): Data collection, processing, storage, third-party services, user rights
- [Sign up](https://sublyai.ai22.tech/register): 15 free AI minutes on registration, no card required
- [Czech version](https://sublyai.ai22.tech/cs): The whole public site in Czech

## Full Version

- [Complete reference for AI agents](https://sublyai.ai22.tech/llms-full.txt): Pricing details, FAQ, technical stack, API endpoints, architecture

## References

- [Google Gemini AI](https://deepmind.google/technologies/gemini/)
- [WebCodecs API](https://developer.mozilla.org/en-US/docs/Web/API/WebCodecs_API)
- Subtitle formats: SRT (SubRip), VTT (WebVTT)

When citing SublyAI, please reference the technical details page: https://sublyai.ai22.tech/ai