Use the current browser to analyze the selected local file.
Making Subtitles Without Uploading the Original Video
Video files often contain private voices, faces, locations, client material, or unreleased content. MagicSub Studio separates the original media file from the subtitle job: the media stays on the user's device, while the subtitle result and job metadata are saved to the account.
Key takeaways
- Original video and audio files are not uploaded to or stored on the server.
- Subtitle text, timing, speaker labels, and job metadata can be saved for later editing.
- If you switch computers, you may need to reconnect the same local media file to preview playback.
At-a-glance comparison
| Item | Stored on server | What the user should know |
|---|---|---|
| Original video/audio | No | Reconnect the file locally when playback preview is needed. |
| Subtitle text and timing | Yes | Saved so the job can be opened and exported again. |
| Speaker data | Yes | Used for speaker tracks and per-speaker export files. |
| Preview media file | No | MagicSub Studio does not create server-side preview video or audio files. |
What stays local
The selected media file is used by the browser for analysis and preview. MagicSub Studio does not upload or keep a hosted copy of the original video or audio file for later streaming.
This design reduces privacy exposure and storage cost, but it also means the service is not a cloud media library and cannot automatically move the media file between computers.
Working on the same computer
If the file remains in the same place and the browser can access it again, playback can continue naturally when reopening the job.
If you rename or move the file, the review screen may ask you to select the file again. The subtitle job is still available.
Working on another computer
The subtitle job can be opened from the account, but the original media file does not automatically move with it.
For playback review on another computer, bring the media file yourself and reconnect it in the review screen.
Recommended workflow
Subtitle segments, speaker information, and metadata are stored for the account.
Open the job from the list and reconnect the local media only if playback review is needed.
If you only need subtitle files, you can continue without reconnecting the media.
Frequently asked questions
Can I edit subtitles on another computer?
Yes. The subtitle job can be opened from the account. Playback preview requires reconnecting the local media file.
Why not create a preview video?
Preview files can become large and create privacy and storage costs. MagicSub Studio focuses on subtitle data instead.
How long are jobs kept?
The default retention period is 3 days from creation or extension.
Related guides
What to check when choosing a free AI automatic subtitle tool for real editing work.
A feature-by-feature guide to the subtitle review screen and timeline editor.
How each AI subtitle export format fits review, web captions, and editing-program workflows.
Which MagicSub Studio AI subtitle export formats match the major editing programs.
How speaker separation helps editing, where it can fail, and how to review it.
Why subtitle files and motion templates are different, and how editors can combine them.
What affects browser AI model setup, transcription speed, diarization speed, and long-video stability.
A final review checklist for text accuracy, timing, line breaks, speaker labels, and import checks.
Try it in MagicSub Studio
Choose a video or audio file, select the video language and expected speaker count, then create a free subtitle draft you can review and export.