Find subtitle problems
before viewers do.

Audit timing, overlaps, reading speed, line length and duration. Every finding points to an exact cue and timestamp.

Safety rule

Auto Fix never rewrites dialogue or guesses new line breaks. It only applies timing changes when enough collision-free space exists.

01 / Source files

Upload subtitles

Up to 100

Drop files here or browse SRT, VTT, ASS, SSA, SMI, SUB and MPL

02 / Audit mode

Choose the handling level

Check only Create a detailed report and downloadable checked copy without requesting automatic fixes. Check & safe fix Recommended after review Format-preserving fixes for SRT, VTT, ASS and SSA. Other formats receive a check-only report.

QC thresholds

Max CPS Max chars / line Max lines Minimum gap (ms) Min duration (ms) Max duration (ms)

What the audit checks

A production handoff, not a vague pass/fail.

The result separates blocking timing errors from readability warnings and minor notices, with the exact cue number and timestamp attached.

Reading speed: CPS
Line density: CPL + lines
Timing integrity: Overlap + gap
Screen time: Cue duration

Sample audit docket

episode-07.en.srt

Review needed

Cue overlap00:08:14.240

Cue 184 overlaps the previous cue by 320 ms.

Reading speed00:12:03.600

Cue 267 reaches 26.4 CPS; dialogue is left unchanged for human review.

✓

Safe fix applied00:16:42.000

Cue 351 was safely extended to 1,000 ms without touching the next cue.

Check + fix

SRT, VTT, ASS, SSA

Native cue structures can be safely reordered and short durations extended when collision-free space is available.

Check only

SMI, MicroDVD SUB, MPL2

These formats receive the same cue-level audit while keeping their source syntax untouched.

Privacy

Temporary processing

Files follow the same automatic cleanup lifecycle as the rest of Subconverter's processing tools.

Find subtitle problems before viewers do.