How it works
- Drop in audio or video. Large videos are fine: your browser extracts the audio track, so the video is never uploaded.
- Tick the captions option. Choose to generate captions so you get SRT and VTT with the transcript.
- Sign in with Google and start. Sign-up includes 10 free minutes, no card.
- Download the files. Use the .srt for YouTube and most editors, or the .vtt for the web.
Quick facts
| Lines per caption | Up to 2 |
|---|---|
| Characters per line | Up to 42 |
| Caption duration | 1 to 7 seconds |
| Overlap | None |
| Encoding | UTF-8 |
| Formats | .srt and .vtt |
| Per file | Up to 3 hours of audio |
Plan prices and limits are on the pricing page. Pricing.
Free tools for your SRT
Already have an SRT? Fix broken characters, validate numbering and timestamps, convert between SRT and VTT, and check reading speed. All of them run in your browser.
Privacy
The video stays on your device. The audio is processed on our own server. The free tools linked on this page run in your browser and the file is not uploaded.
Frequently asked questions
What is an SRT file?
A plain text file with numbered caption blocks. Each block has a start and end time and one or two lines of text.
Should I use SRT or VTT?
SRT works in most editors and on YouTube. WebVTT is the format for the HTML video tag on the web. The content is similar; the timestamp separator and header differ.
Why do I see strange characters in my captions?
Usually an encoding mismatch: a UTF-8 file read as Windows-1252. Save and open it as UTF-8, or use the free encoding fixer.
Does it work for YouTube?
Yes. In YouTube Studio, add the language under Subtitles and upload the file.
Is it free?
You get 10 free minutes at sign-up. After that, see the pricing page.
Go deeper
- How to Create an SRT File (Step by Step)
Create an SRT subtitle file from audio or video: format rules, a sample, manual and automatic methods, and the checks that stop import errors.
- Subtitle Reading Speed: Characters per Second Guide
How fast can viewers read subtitles? Learn characters per second, the 42 character line rule, how to calculate CPS and how to fix captions that fly by.
- Open vs Closed Captions: Burned-In or SRT?
Open captions are part of the picture; closed captions are a separate file. See the differences, when to use each and how to make both from one transcript.
- SRT vs VTT: Which Subtitle Format Should You Use?
Compare SRT and WebVTT: syntax differences, styling, platform support and when to pick each. Includes a conversion checklist and a side by side sample.
- Free tool: SRT validator
Runs in your browser, the file is not uploaded.
Make your SRT
10 free minutes at sign-up, no card.
Make my SRT