Free browser caption generator
Add captions to a video automatically
Drop a short video, generate captions on your device, fix the text, and download an SRT or a burned-in video. Your media is never uploaded.
Want captions, clips, and publishing in one workflow?
Create a free Shortify account when you're ready to turn longer videos into finished social clips.
Generate Video Captions Without Uploading Your File
Shortify's automatic caption generator transcribes spoken audio directly in your browser. The video and generated caption text stay on your device while you review and edit each timed subtitle block.
The tool is designed for short social videos. It can produce a standard SRT subtitle file for YouTube, TikTok, Instagram, or an editor. On supported desktop browsers, it can also render the captions directly into the video.
How It Works
- Drop in a spoken video. Choose a clip up to 90 seconds long.
- Generate captions locally. A speech-recognition model runs on your device; the first run downloads and caches the selected model.
- Edit and export. Correct names or wording, then download an SRT or create a captioned video where supported.
Frequently Asked Questions
No. The tool listens to the spoken audio and generates timed captions automatically. You can then download the generated captions as an SRT file.
No. Audio extraction, speech recognition, caption editing, preview, and supported video rendering happen in your browser. Your video and caption text are not uploaded to Shortify.
Local speech recognition needs a Whisper model. The fast model is about 78 MB and the higher-accuracy model is about 148 MB. Your browser caches it for later uses.
Choose an English-specific model for English speech or a multilingual model that automatically detects many common languages.
On browsers that support the required video and audio encoders, yes. If browser rendering is unavailable, you can still download the SRT and use it in any video editor or publishing platform.
Speech recognition and rendering use your device's memory and processor. The initial limit keeps the free tool reliable for short-form videos while browser support is measured.