Tool Lab

LOCAL FILE UTILITY · U2

SRT correction with an independent third anchor

Fit a shift and stretch with two anchors, check a third point, and export a consistent subtitle correction.

Scope: Rejects inconsistent correction and negative times. Three anchors cannot rule out every local cut.

Check a subtitle correction with a third anchor

Three subtitle/video time pairs are needed. The first two fit a global shift and stretch; the independent third checks that fit. A mismatch blocks export. Three points cannot detect every local jump. UTF-8 SRT only, up to 5 MiB / 100,000 cues. Processing stays in this browser.

Times use HH:MM:SS,mmm. Subtitle time is the original cue time; video time is when the line should appear.

Fit anchor 1
Fit anchor 2 (farther along)
Independent check anchor 3 (a different point)

No subtitles processed yet.

How to use
  1. Choose UTF-8 SRT and find three subtitle/video time pairs.
  2. Fit the first two points and check the independent third.
  3. Review the residual and timing changes before downloading.
Limits and context
Read format limits and warnings before exporting. Sample buttons use synthetic content. No uploaded content is sent to a server.
Original task discussion · Implementation context
The discussion explains task context; it does not prove this tool is better than existing alternatives.