Human-Level Accuracy Subtitles, Powered by Multi-Stage AI
Generate professional WebVTT (.vtt) subtitle files or burn high-quality captions directly into your video in minutes. Optimized for the world's major languages with context-aware verification.
Stop the scroll.
Content Creators & YouTubers
80% of social media videos are watched on mute. Burn professional, high-impact captions into your MP4s for TikTok, Reels, and Shorts. Stand out and keep them watching.
Make learning accessible.
Coaches, Teachers, & HR
Turn 60-minute lectures into perfectly synced VTT transcripts in seconds. Boost student retention and ensure your courses are inclusive and compliant with accessibility standards.
Scale your global reach.
Marketing & Agencies
Localize webinars, ads, and internal training for a worldwide team. With support for 24+ languages and context-aware AI, you can communicate across borders without the agency price tag.
How it works
Three simple steps to get professional subtitles on your videos.
Upload & Select
Drop your video and choose your target language.
AI Processing
Our multi-stage engine generates and verifies your subtitles.
Download
Get your video with burned-in captions and the VTT file.
Simple, transparent pricing
Buy credits and use them whenever you need. 1 credit = 1 minute of video. No subscriptions, no hidden fees, no expiration.
Starter
45 credits
$0.13 per credit
- Burned-in subtitles
- WebVTT file export
- 24+ languages
- Cloud processing
- Secure file storage
- Maximum video duration - 1 hour
- Maximum file size - 1 GB
Pro
180 credits
$0.08 per credit
- Burned-in subtitles
- WebVTT file export
- 24+ languages
- Cloud processing
- Secure file storage
- Maximum video duration - 1 hour
- Maximum file size - 1 GB
Studio
450 credits
$0.07 per credit
- Burned-in subtitles
- WebVTT file export
- 24+ languages
- Cloud processing
- Secure file storage
- Maximum video duration - 2 hours
- Maximum file size - 2 GB
About PolySub
PolySub is a cloud-based video processing service that makes it easy to add professional subtitles to any video. We combine automatic speech recognition, human-precision translation with powerful video encoding to deliver high-quality results in minutes.
Cloud-Native Architecture
Every video is processed on Google Cloud infrastructure using dedicated Cloud Run Jobs. This means consistent performance and automatic scaling without impacting your local machine.
Agentic-Powered Subtitles
We use state-of-the-art models with custom-built agentic workflow to transcribe, translate and generate accurate subtitles. The system supports 24+ languages with high accuracy, even for accented or technical speech. Perfect for content creators reaching global audiences, businesses with international teams, or anyone looking to make their videos more accessible.
Our Mission
We believe every video should be accessible to everyone, regardless of language or hearing ability. PolySub exists to make subtitle creation as simple and affordable as possible, so creators can focus on making great content while we handle the technical details.
Frequently Asked Questions
Find answers to common questions about PolySub.
Still have questions? Contact us
Get in touch
Have a question or need help? We'd love to hear from you.
hello@polysub.app
Response Time
We typically respond within 24 hours