Free Online AI Subtitle Video Tool

Burn subtitles into any video right in your browser — no upload, no watermark, no sign up

Add Subtitles Now

Add Subtitles To Your Video

Choose a video, generate subtitles with AI, then download the clip

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Subtitles (SRT format)

or you can paste an existing SRT text

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100% Privacy
Friendly

🆓

Completely
Free To Use

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Zero
Watermarks

How It Works

100% Private, your video never leaves your browser. Subtitles are burned in locally on your device using WebAssembly. Nothing is uploaded to our servers.

This tool runs FFmpeg, the industry‑standard video toolkit, compiled to WebAssembly so it runs entirely inside your browser. Paste your captions in SRT format and it renders them permanently into the video, no account, no watermark, no server queue.

The first time you run it, the tool downloads the video engine (~30MB) to your browser and caches it, so later runs start instantly. Because the work happens on your own device, very large files may take longer on lower‑powered machines.

Want to subtitle, trim, resize or generate videos automatically at scale? The Bannerbear API automates it for you. Plug it into your app or no‑code workflow and generate thousands of videos on autopilot.