Is the AI subtitle generator free?

Yes — 100% free, no signup, no usage limits.

Does it save my data?

No. Inputs are processed in your browser and never uploaded to a server.

Can I use it on mobile?

Yes. The interface is fully responsive and works on iOS and Android.

SRT or VTT — which should I pick?

SRT is the universal format for editing software (Premiere, DaVinci, YouTube, TikTok, VLC). WebVTT is the modern web standard for HTML5 video and HLS streaming. Pick based on where the captions will end up.

Can I edit the subtitles before downloading?

The current version downloads the auto-generated subtitles directly. Open the .srt in any text editor — the format is human-readable and easy to tweak.

WebGenAI

AI Subtitle Generator — SRT & VTT, Free

Upload a video or audio file and download timed subtitles in SRT or WebVTT format. Bring your own OpenAI key — files are sent directly from your browser.

OpenAI API Key

Your key is stored only in your browser (localStorage) and sent directly to the provider. We have no backend, so it never touches our servers. Get an OpenAI API key.

Drop audio or video up to 25 MB. Outputs SRT or VTT subtitles.

How to use

Step 1: Paste an OpenAI API key
Step 2: Drop a video or audio file (up to 25 MB)
Step 3: Choose .srt or .vtt format
Step 4: Click Generate subtitles
Step 5: Download the file and import into your editor or player

SRT vs WebVTT

SRT is the universal format — works in Premiere, DaVinci, YouTube, VLC, and most editing software. WebVTT (.vtt) is the modern web standard used by HTML5 <track> elements and by HLS streaming. Same timestamps, slightly different syntax.

Frequently asked questions

A tool that listens to a video or audio file and produces timed subtitle files (SRT or WebVTT) you can drop into editing software or web players.