Add captions to a finished clip
Attach an SRT or VTT subtitle file to a video before publishing or sharing it.
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Choose videoMP4, WebM or MOVAbout Add Subtitles to Video
Add Subtitles lets you combine a video with an SRT or VTT subtitle file. Preview the subtitle timing, then export an MP4 containing a selectable subtitle track.
Common use cases
Create accessible viewing copies
Prepare a version with timed captions for meetings, tutorials or social content.
Match translated subtitle files
Combine an already translated subtitle track with the source video for review.
How it works
1
The browser loads the selected video and subtitle file.
2
Subtitle timestamps are aligned to the video timeline and prepared as a subtitle track.
3
The output video is generated with the subtitle track included according to the tool's supported export workflow.
Privacy & file handling
Subtitle processing stays in the browser
The supported workflow reads the source video and subtitle file locally instead of requiring them to be uploaded to Zavilo for processing.
Limitations and important notes
- Subtitle timing must already match the source video; this tool does not automatically fix badly synchronized captions.
- Font appearance and subtitle rendering behavior can vary between players when subtitles are kept as a track rather than burned into pixels.
- Unsupported subtitle syntax or malformed timestamps can prevent correct output.
Add subtitles vs translate subtitles
| Feature | Input | Primary task |
|---|---|---|
| Add Subtitles to Video | Video + existing subtitle file | Attach captions to a video |
| Translate Subtitles | SRT or VTT file | Create a translated subtitle file while preserving timing |
How to use Add Subtitles to Video
- 1
Choose an MP4, WebM or MOV video.
- 2
Choose an SRT or VTT subtitle file.
- 3
Preview the subtitle timing with the video.
- 4
Click Add Subtitles.
- 5
Download the MP4 with its embedded subtitle track.
Tips for better results
- Check subtitle timing in the preview before exporting.
- SRT is widely used and easy to edit in a text editor.
- Embedded subtitle tracks can be enabled or disabled in compatible video players.
Frequently asked questions
Are the subtitles permanently burned into the picture?
No. They are embedded as a separate subtitle track so compatible players can turn them on or off.
Which subtitle formats can I use?
You can use SRT or WebVTT subtitle files.
What format is the exported video?
The result is exported as MP4 with a compatible subtitle track.