Before uploading captions, confirm whether the target expects SRT or WebVTT, then check timestamp style, whole-file timing offset, cue numbering, and encoding. Chakan converts subtitles locally in the browser so you can review format and timing before uploading, embedding captions on a site, or handing the file back for manual editing.
Subtitle checks / video upload / local conversion
Subtitle SRT, WebVTT, timing offset, and local pre-upload review
A local browser workflow for SRT to WebVTT, WebVTT to SRT, uniform subtitle timing offsets, cue renumbering, and pre-upload format checks.
subtitle format converterSRT to VTTWebVTT to SRTsubtitle time offsetlocal subtitle converterweb video caption uploadsubtitle renumberingsubtitle file checker
Do not fix subtitle format by renaming the suffix
A common failure is uploading SRT where WebVTT is required, or the reverse. SRT usually uses comma milliseconds, while WebVTT usually starts with `WEBVTT` and uses dot milliseconds. Renaming the file alone does not convert the content.
- Must Do: Confirm whether the target platform expects SRT or WebVTT.
- Must Do: Convert the content format instead of just changing the filename.
- Should Do: Review encoding and cue numbering when subtitles come from an older workflow.
Uniform offsets help only when the whole file drifts equally
A uniform offset works when every subtitle is early or late by the same amount. If only some sections drift, the source timing, frame-rate, export settings, or manual edits need section-by-section correction instead of repeated global offsets.
- Must Do: Use a global millisecond offset only for whole-file drift.
- Should Do: Return to the source subtitle timeline when drift is local.
- Later: automatic transcription, translation, and cloud collaboration remain out of scope.
Common lookup scenarios
Convert SRT subtitles into WebVTT for web video
Convert WebVTT back into SRT for players or upload portals
Apply a uniform time shift to a whole subtitle file
Clean up cue numbering before publication
Review local subtitle files before website, course, or short-video upload
Keep real subtitle text out of public result URLs
Recommended workflow
- Confirm whether the target platform expects SRT or WebVTT
- Use the subtitle converter to review timestamp style, cue count, time offset, and preview output
- Apply a millisecond offset only after checking that the whole file drifts consistently
- Check encoding locally if subtitles come from older exports or multilingual workflows
- Use text splitting only for local prep, not to publish real scripts
- Keep customer captions, unreleased scripts, meeting transcripts, and internal review notes out of public result URLs, sitemap entries, and llms.txt examples
Related tool entries
A local browser workflow for SRT to WebVTT, WebVTT to SRT, uniform subtitle timing offsets, cue renumbering, and pre-upload format checks.
Subtitle format converter
Convert SRT subtitles to WebVTT, WebVTT to SRT, or normalize SRT locally with time offsets and downloadable output.
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Inspect and convert local text file encodings such as UTF-8, UTF-16, GB18030, Big5, Shift_JIS, EUC-KR, and Windows-1252.
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Split pasted text into chunks by line count or character count, then review chunk stats and export chunk mappings.
LookupToolChakanFAQ
Before uploading captions, confirm whether the target expects SRT or WebVTT, then check timestamp style, whole-file timing offset, cue numbering, and encoding. Chakan converts subtitles locally in the browser so you can review format and timing before uploading, embedding captions on a site, or handing the file back for manual editing.
Why not rename `.srt` to `.vtt` directly?
Because renaming does not add the `WEBVTT` header or convert comma timestamps into dot timestamps. A platform that validates format can still reject the file.
Will this topic expose my subtitle text publicly?
No. Only short synthetic public examples are allowlisted. Real captions, course scripts, customer subtitles, and internal review notes should remain local-only.
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