Convert an SRT subtitle file to YouTube's own legacy SBV format locally in your browser - for the classic YouTube caption upload path. No upload.
Running locally on your device ...
Running locally on your device ...
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Your files never left your device
No. Everything runs in your browser - your file never leaves your device. How this is verifiable
SBV (SubViewer, referred to by YouTube as the "SubViewer" format) is the older, YouTube-native subtitle format from before today's automatic caption editor - some older guides and third-party tools for the YouTube upload path still expect it. This tool converts an existing SRT file into that format.
Technically, SBV differs from SRT mainly in its timing line: instead of a sequential number plus a "-->" line, SBV writes the start and end time comma-separated on a single line (e.g. "0:00:01.749,0:00:04.200"), with no index. The tool reads the timings and text of each SRT subtitle and writes them back out in SBV format.
The conversion runs entirely locally in your browser - the file is not uploaded and no foreign library is loaded. If the SRT file contains no valid timestamps, the tool stops honestly instead of producing an empty file.
| Input formats | SRT |
|---|---|
| Auto-conversion | MP4 |
| Output format | SBV |
| Batch processing | No |
| Processing | Locally in your browser (JavaScript) |
| File upload | None |
Limitations: Timings and text are carried over. SBV has no concept of positioning or style blocks - an SRT file does not contain any anyway. The tool converts, it does not translate into another language.
No, the conversion runs entirely locally in your browser.
Mostly for older YouTube upload workflows and third-party tools that still expect the classic SubViewer format.
Yes, the start and end time of each subtitle is carried over to the millisecond; only the line format changes.
Yes, there is the sibling tool "Convert SBV to SRT" for that.
Merge subtitles · Split subtitles · SBV to SRT · SRT to LRC · SRT to TTML · VTT to SBV