What is checked
Bounded syntax, timestamp order, overlap, declared media boundary, duration, gap, estimated reading speed, line count and length, cue IDs and WebVTT block coverage.
Free local subtitle evidence
Subtitle Timing & Accessibility QA Studio
Inspect SRT or WebVTT overlap, boundaries, pacing and layout-risk heuristics in your browser. Export a same-format normalized file, a cue ledger and a hash-backed receipt; cross-format conversion appears only after syntax and cue round-trip checks.
- 1 · Input
- 2 · Analyze
- 3 · Decision
- 4 · Evidence Pack
- 5 · Verify
1. Add one subtitle file
UTF-8 SRT/WebVTT · maximum 5 MiB · 10,000 cues. Processing stays in this tab.
2. Set the check boundary
Profiles are source-informed FastTool heuristics—not Netflix, BBC, WCAG or player compliance certificates.
Without it, out-of-media remains unverified.
Ready.
PASS
Worked synthetic sample: exact, reproducible evidence
This is an engine-derived fixture result, not a customer result or popularity claim. Re-run the PASS sample in the workbench to reproduce the decision and artifacts.
| Fixture | Cues | Verdict | Artifacts | Engine SHA-256 | Receipt core SHA-256 |
|---|---|---|---|---|---|
subtitle-qa-v1-synthetic-pass | 3 | PASS | 7 | e7424750d6c2376baad7472d2074c5a74294458a9717883e44940ede77246604 | 1204f9ff64aac95dc5359d7c7c64259b7b6390ce20cb67105a4f64a81a236b05 |
Sources reviewed 2026-08-09 · boundaries below · exact fixture bytes are bundled with the public tool.
What is not claimed
No OCR, audio alignment, translation quality, target-player rendering, accessibility certification or Netflix/BBC compliance claim. STYLE, REGION and cue layout settings require review.