Subtitle quality control
Subtitle Reading Speed Checker
Measure characters per second for every SRT or VTT cue and flag captions that exceed a selectable reading-speed threshold.
SRT or VTT subtitles
Text is processed locally.
Speed report
Run the tool to create output.
One free try, then Google sign-in.
Continue the audio workflow
Move between raw audio, timed subtitle files, and publishable text without returning to the home page.
Best for
- Quality-checking subtitle drafts
- Finding captions that disappear too quickly
- Reviewing SRT exports before delivery
- Comparing cue length with display time
Key features
- SRT and VTT parsing
- Characters-per-second calculation
- Adjustable CPS threshold
- Per-cue problem list
- Local browser analysis
Limits to know
- The selected CPS threshold is a review target, not a universal accessibility rule
- The checker does not change cue timing
- Markup is excluded from visible-text counts
- Reading needs vary by audience, language, and platform
Questions this tool answers
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Frequently asked questions
What does CPS mean in subtitles?
Characters per second compares the visible character count with how long a cue stays on screen.
Does the checker support both SRT and VTT?
Yes. Paste or open either format and choose a review threshold.
Will the tool fix fast captions automatically?
No. It identifies cues to review so you can adjust wording or timing deliberately.
Are subtitle files uploaded?
No. Parsing and speed calculations run locally.
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