SublyAI is a free AI video translator that automatically transcribes speech, translates it to 50+ languages, and generates subtitles or burned-in captions. Unlike cloud-based tools (such as VEED or Kapwing), SublyAI processes videos locally in your browser - your video never leaves your device. Translate YouTube videos, MP4 files, and any video content online with our AI video translator app.
Supported formats: MP4, MOV, AVI. No file size limits.
Audio is extracted locally in your browser using WebCodecs API. Video never leaves your device.
Phase 1 (Deepgram): transcription with word-level timestamp precision. Phase 2 (Google Gemini): translation and transcript refinement for perfect results.
Automatic translation using Google Gemini AI. Including English, Czech, German, French, Spanish, Russian, and more.
Export as SRT, VTT, or burn-in (embed subtitles directly into video client-side).
Current AI models have inherent limitations: they either provide accurate word-level timestamps but imperfect translation, or they can perfectly adapt text for readability but lose timing precision (so-called "timestamp drift"). SublyAI is the first in the world to combine two specialized models: Phase 1 (Deepgram) extracts a precise transcript with word-level timestamps. Phase 2 (Google Gemini) uses a model optimized for language quality and context. The result is subtitles that are accurate in both timing and linguistic expression.
| Feature | SublyAI | VEED | Kapwing |
|---|---|---|---|
| Video Processing | Client-side (in your browser) | Cloud-based (uploaded to servers) | Cloud-based (uploaded to servers) |
| Privacy | Video never leaves your device | Video uploaded to cloud | Video uploaded to cloud |
| AI Technology | Deepgram + Google Gemini (two-phase) | Proprietary AI/not specified | Proprietary AI/not specified |
| Timestamp Accuracy | Word-level precision | Sentence-level | Sentence-level |
| Speed | ~30 seconds (no queues) | Depends on queue | Depends on queue |
| Price | 15 min FREE on registration | Paid (from $12/month) | Freemium with watermark |
| Import Own Subtitles | Free, no minutes deducted | Limited | Limited |
SublyAI uses WebCodecs API for audio extraction and FFmpeg.wasm for video processing directly in your browser. Your video files are processed locally; only extracted audio is transmitted to Google Cloud for AI analysis.
Phase 1 (Deepgram): Speech-to-text with word-level alignment. Phase 2 (Google Gemini): Language refinement for optimal readability and translation. This approach overcomes limitations of current models that suffer from either timestamp drift or suboptimal language output.
Extracted audio is processed over encrypted connection (SSL/TLS). We use ephemeral storage (signed URLs) - audio files are automatically deleted after processing completion.
Video
MP4, MOV, AVI, WebM
Import
SRT, VTT
Export
SRT, VTT, Burn-in (video with subtitles)
Languages
50+ languages including English, Czech, German, French, Spanish, Italian, Polish, Russian, Chinese, Japanese, and more
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.
SublyAI uses Deepgram for speech recognition (word-level accuracy) and Google Gemini AI (Vertex AI) for translation and refinement. A unique two-phase approach: Deepgram ensures precise word-level timestamps, Gemini optimizes language output.
Yes! We offer 15 minutes of AI processing free on registration. No credit card required. After that you can top up with pay-as-you-go credit packs anytime via Stripe Checkout — purchased minutes never expire.
Main differences: 1) SublyAI processes videos client-side (video never leaves your device) while VEED uses cloud processing. 2) SublyAI offers 15 min free on registration, VEED has more limited free plan. 3) SublyAI uses two-phase AI processing for high fidelity.
Yes! Download your YouTube video and upload it to SublyAI. You can translate to multiple languages at once and export as SRT, VTT, or burn-in subtitles.
SublyAI is a web-based video translator app that works in your browser. No download required - just visit our website, upload your video, and get instant translations.
No. Your video files are processed locally in your browser. Only extracted audio is temporarily transmitted to Google Cloud for AI analysis and automatically deleted after completion.
SublyAI supports translation to 50+ languages including English, Czech, German, French, Spanish, Italian, Polish, Russian, Chinese, Japanese, Korean, Portuguese, Dutch, and many more.
Yes, you can upload your own SRT or VTT file and perform burn-in (embed into video) for free. This feature does not deduct any minutes.
Thanks to our two-phase approach, we achieve 95%+ fidelity. Phase 1 ensures precise word-level timestamps, Phase 2 optimizes text quality.
Client-side means processing happens directly in your browser, not on remote servers. Your video never leaves your device, ensuring maximum privacy and speed.
Typically 30 seconds to 2 minutes depending on video length. Unlike cloud solutions, you never wait in a queue.
Yes, SublyAI uses client-side architecture, meaning your video files never leave your device. AI communication is encrypted (SSL/TLS) and audio files are automatically deleted after processing.
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