PolySubCloud Multilingual Video Subtitles

PolySub takes a straightforward approach to video localization: upload a file, choose the original and target languages, and wait for the processed results. The service returns both a WebVTT subtitle file and an MP4 with subtitles burned directly into the video, so creators do not need to assemble a local subtitle workflow.

Built for localization workflows

The service is aimed at content creators and YouTubers making short-form videos, teachers and trainers adding synchronized captions to lectures, and marketing or agency teams localizing webinars, advertisements, and internal training. Burned-in captions can be particularly practical for platforms such as TikTok, Reels, and Shorts. PolySub cites the company’s estimate that 80% of social media videos are watched with the sound off.

PolySub describes its engine as “multi-stage AI,” with contextual checks intended to reduce the mechanical errors associated with literal translation. Processing runs on Google Cloud’s Cloud Run Jobs. The website does not disclose the underlying models or accuracy measurements, so buyers have limited technical information beyond the stated workflow.

Pay-as-you-go pricing

There is no subscription. Credits can be purchased when needed and do not expire. One credit covers one minute of WebVTT subtitle generation; burning HD subtitles into the video costs an additional 0.5 credit per minute. New accounts receive 10 minutes of free usage.

• Starter: 120 credits for €6, with a maximum video length of 1 hour and a 1 GB file limit
• Pro: 360 credits for €15, with a maximum video length of 1 hour and a 1 GB file limit
• Studio: 900 credits for €30, with a maximum video length of 2 hours and a 2 GB file limit

Every plan includes burned-in subtitles, WebVTT export, support for more than 24 languages, cloud processing, and file storage. The usage-based model is a practical fit for people whose subtitle needs vary from project to project, though regular users will still need to purchase credits after the introductory allowance is used.

What to consider

PolySub’s core proposition is clear: outsource multilingual subtitle generation and receive files ready for distribution. Its main tradeoff is limited public detail about the AI models and translation accuracy. For potential users, the available information is enough to compare the workflow and pricing, but not to assess quality independently before trying the service.

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