Subtitle Generator
Generate transcript segments for captions from video or audio files in your browser.
What this tool is for
Create timestamped transcript text that can be adapted into captions and subtitles.
Video creators, course builders, marketers, and accessibility-focused teams.
Supported formats
- MP4
- WebM
- MP3
- WAV
- M4A
Common use cases
- YouTube captions
- Course subtitles
- Social clips
- Webinar captions
Example workflows
Prepare subtitles for a course video
Upload the lesson video, generate timestamped transcript text, then edit line breaks before publishing.
Caption a social clip
Use a short MP4 or WebM clip, create a transcript draft, and clean it for fast-moving captions.
Create accessibility captions
Generate a first draft from the spoken audio, then review it for names, punctuation, and timing.
Tips for Better Results
- Keep caption lines short and easy to read.
- Always review AI-generated subtitles before publishing.
- Use clear source audio without loud background music.
- For best timing, use shorter clips rather than one very long video.
Why use SuperTextHub?
Files are processed in your browser and are not uploaded to SuperTextHub. The tool is free, does not require an account, and supports transcript copy or download workflows.
Troubleshooting
The SRT needs cleanup
AI output is a draft. Edit line breaks, punctuation, names, and timing before publishing.
The captions are too long
Split long sentences into shorter caption lines in your video editor.
The video audio is unclear
Use a cleaner audio export if you have one. Captions are only as good as the source recording.
Frequently Asked Questions
Can I download SRT subtitles?
When timestamp chunks are available, the transcript viewer offers an SRT-style download.
Does it work with video files?
Yes. Supported video files are decoded in the browser and the audio track is transcribed.
Are subtitles generated automatically?
Yes. You provide the media file, then the browser-based AI model generates the transcript.