What is the best subtitle timing checker?

The best one publishes its rules. This free checker tests every cue against the Netflix timing rules — 83ms minimum gap, 833ms minimum duration, 7-second maximum duration — and reports overlaps, zero-duration cues, and empty text as errors with exact cue numbers.

Is there a free subtitle timing checker?

Yes — this checker is completely free with no signup. Paste SRT or WebVTT text to get a pass/fail verdict, per-cue issues, and error/warning counts instantly.

How to check subtitle timing?

Paste your SRT or VTT into the checker. It flags overlapping cues, cues that end before they start, cues too short to read (under 833ms), cues on screen too long (over 7s), and gaps between cues under 83ms — then tells you the file passes or fails.

How does a subtitle timing checker work?

It applies fixed timing rules to each cue, not AI: it compares each cue start and end against the previous cue, measures gaps and durations in milliseconds, and sorts violations into errors (overlaps, zero duration, empty text) and warnings (flash risk, short gaps, overlong cues). It never analyzes your audio, so it cannot verify actual sync.

What is a subtitle timing checker?

A subtitle timing checker is a free online tool that gives you quick, accurate results without spreadsheets or manual math. This version runs entirely in your browser for instant, private results.

How do I check subtitle timing checker?

Paste or enter your content above and the checker analyzes it instantly. Review the results and apply the suggested fixes.

Why does subtitle timing checker matter?

It directly affects your visibility, credibility, and results. Poor scores mean missed opportunities; the checker shows you where you stand and how to improve.

Subtitle Timing Checker

What is Subtitle timing checker?

Caption Timing Validator — Catch subtitle timing errors before you publish: paste SRT or VTT to detect overlaps, zero-duration cues, and awkward gaps - all in one check.

Pure rule engine over your cue list, never AI and never an audio sync analysis: gap under 83ms triggers a minimum-gap warning (Netflix 2-frame rule at 24 fps); duration under 833ms triggers a flash-risk warning; duration over 7000ms triggers an excessive-duration warning; overlapping cues, zero-duration cues, and empty text are errors. Pass means zero errors; warnings never fail the file. Single-cue inputs skip gap checks because there is nothing to compare against.

Why use this subtitle timing checker?

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Built for subtitle timing checker

Catch subtitle timing errors before you publish: paste SRT or VTT to detect overlaps, zero-duration cues, and awkward gaps - all in one check.

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Transparent & honest

Thresholds come from the Netflix Timed Text Style Guide (83ms gap, 833ms minimum, 7s maximum) — a broadcast standard, not a social-platform rule.

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Private by design

Everything runs in your browser. Your inputs never leave your device.

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Works everywhere

Fully responsive — perfect on desktop, tablet, and mobile. No app needed.

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Regularly updated

Regularly maintained and reviewed to ensure accuracy.

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Free forever

No accounts, no limits, no watermarks. Use Caption Timing Validator as much as you need.

How to use Caption Timing Validator

1Paste your subtitle text (SRT or WebVTT) into the input box.
2Run the check — every cue is validated against the timing rule set.
3Review each issue: cue number, rule, severity (error or warning), and message.
4Fix errors first (overlaps, zero-duration cues, empty text) — they fail the file.
5Address warnings (flash-risk duration, short gaps, overlong cues), then re-check.

What can you do with Caption Timing Validator?

Check srt timing errors — Catch subtitle timing errors before you publish: paste SRT or VTT to detect overlaps, zero-duration cues, and awkward gaps - all in one check.
Subtitle overlap detector — Catch subtitle timing errors before you publish: paste SRT or VTT to detect overlaps, zero-duration cues, and awkward gaps - all in one check.
Fix subtitle sync issues — Catch subtitle timing errors before you publish: paste SRT or VTT to detect overlaps, zero-duration cues, and awkward gaps - all in one check.

Good to know

Thresholds come from the Netflix Timed Text Style Guide (83ms gap, 833ms minimum, 7s maximum) — a broadcast standard, not a social-platform rule.
The checker compares cue timings only; it never listens to audio and cannot confirm captions are in sync with speech.
No official timing standard exists for social short-form platforms — only the published broadcast rules are applied.
Unparseable timing lines cause the block to be skipped and reported as an error on the whole run.

How it works

Pure rule engine over your cue list, never AI and never an audio sync analysis: gap under 83ms triggers a minimum-gap warning (Netflix 2-frame rule at 24 fps); duration under 833ms triggers a flash-risk warning; duration over 7000ms triggers an excessive-duration warning; overlapping cues, zero-duration cues, and empty text are errors. Pass means zero errors; warnings never fail the file. Single-cue inputs skip gap checks because there is nothing to compare against.

Examples

Clean two-cue SRT

Passes with zero errors and zero warnings.

Overlapping cues

Fails: cue 2 overlaps cue 1, reported as an overlap error.

People also search for these — this tool handles them all:

subtitle timing checkercheck srt timing errorssubtitle overlap detectorfix subtitle sync issues

Frequently asked questions

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