PolySub

Professional subtitles for every video, powered by context-aware AI

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Updated Jul 2026 · Added Jul 2026

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What is Polysub?

PolySub is a cloud-powered video processing tool that generates professional subtitles and burned-in captions using multi-stage AI. It combines automatic speech recognition with context-aware translation to deliver high-quality WebVTT files or caption-embedded videos in minutes. Built on Google Cloud infrastructure, it supports 24+ languages and is designed for content creators, educators, marketing teams, and agencies.

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Key Features of Polysub

Context-aware multi-stage AI subtitles
WebVTT (.vtt) file generation
Burned-in caption video export
24+ language support
Automatic speech recognition
Cloud-native processing on Google Cloud
Secure file storage
Subject-specific logic for accuracy

Who Should Use Polysub?

Add captions to TikTok, Reels, and YouTube Shorts for social media

Create accessible transcripts for online courses and lectures

Localize webinars and training videos for global teams

Generate subtitles for marketing campaigns and ads

Ensure accessibility compliance for educational content

Polysub: Pros & Cons

✓Pros

Fast processing - converts 60-minute videos to subtitles in seconds
Context-aware AI avoids robotic, literal translation errors
No subscriptions or hidden fees - pay per credit
Supports 24+ languages optimized for major world languages
Cloud infrastructure ensures consistent performance and automatic scaling
Both WebVTT export and burned-in caption options available
Secure file storage with transparent pricing

✕Cons

Maximum video duration limited to 1-2 hours depending on plan
Maximum file size limited to 1-2 GB depending on plan
Burned-in captions require additional credits (0.5 per minute)

Frequently Asked Questions about Polysub

How many credits does it cost to add burned-in captions to a video?

Burned-in captions cost 0.5 additional credits per minute on top of the WebVTT generation cost. So a 10-minute video would use 10 credits for subtitle generation plus 5 credits for burned-in captions, totaling 15 credits. You can generate WebVTT files alone to save credits if you don't need the captions embedded in the video itself.

What's the longest video PolySub can process?

PolySub has a maximum video duration limit of 1 to 2 hours depending on your plan, though the exact threshold isn't specified by the vendor. Check their site or contact support before uploading anything longer to confirm the limit for your account type.

Can I use PolySub subtitles for commercial content?

PolySub generates WebVTT files and burned-in captions for your videos, which you control and own once created. The tool itself is designed for professional use including marketing campaigns and commercial video production, but review their terms of service for any restrictions on your specific use case.

Does PolySub support languages beyond the major ones?

PolySub supports 24+ languages optimized for major world languages, but the vendor does not list which languages are included. Visit their site to see the full language list before committing to a workflow for a language you need.