SublyAI is an 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. Translate YouTube videos, MP4 files, and any video content online with SublyAI.
Supported formats: MP4, WebM, MOV, AVI, FLV, 3GP, MKV, OGV, TS. Limits: 500 MB and 30 minutes.
Audio is extracted locally in your browser using WebCodecs API.
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 is processed in your browser | 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 MediaBunny for fast trimming and export — all directly in your browser. Your video files are processed locally; only the extracted audio is temporarily stored in secure cloud storage for AI analysis and then deleted automatically.
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 and are never used to train AI models.
Video
MP4, WebM, MOV, AVI, FLV, 3GP, MKV, OGV, TS
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.
Registration includes 15 minutes of AI processing free — no credit card required. Styling, watermark, SRT/VTT import and all exports are always free. 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 is processed in your browser) 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 stored in secure cloud storage for AI analysis and automatically deleted after completion. The only exception is an optional format conversion, which uploads the video only after you approve it.
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 is processed in your browser, 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: your video files are processed in your browser. AI communication is encrypted (SSL/TLS) and audio files are automatically deleted after processing.
Register and get 15 minutes of AI processing free.
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