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.
Checking today’s allowance…
Continue the audio workflow
Move between raw audio, timed subtitle files, and publishable text without returning to the home page.
What does Reading-speed checker do?
Measure subtitle reading speed as characters per second: displayed character count divided by cue duration. SceneDub flags cues above your chosen threshold. Its default 20 CPS is a review setting, not a universal accessibility or platform certification.
- Input
- Timed SRT or VTT subtitles
- Output
- Per-cue CPS values and a review report
- Processing
- Local caption analysis
A practical workflow
- Paste or open the timed subtitle track.
- Set a threshold suitable for your audience and delivery requirements.
- Inspect flagged cues and adjust wording or timing in a subtitle editor.
Capability notes updated . Editorial methodology
A reading-speed calculation you can check
Input / starting point
1
00:00:01,000 --> 00:00:03,000
Read this caption.Output / result
18 characters / 2 seconds = 9.0 CPSThe tool strips text markup and normalizes whitespace before counting. Spaces and punctuation count; the report does not automatically rewrite or retime cues.
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
Practical guides
Need sample files? The free creator kit includes caption templates, transcript examples, and original voice-practice scripts.
How to Generate an SRT Subtitle File for YouTube
Create an SRT draft from your own recording, review caption timing and text, and upload the subtitle file in YouTube Studio.
How to Fix Subtitles That Are Out of Sync
Diagnose constant subtitle delay versus progressive drift, choose a positive or negative offset, and shift an SRT or VTT file safely.
Subtitle Reading Speed and Line Breaks Explained
Calculate characters per second, diagnose dense caption cues, and choose line breaks without confusing visual wrapping with subtitle timing.
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.