Readability is more than one number
CPS and WPM help identify fast cues, while line length, duration, gaps and overlaps show different readability or timing problems.
Subtitle tools
Subtitle Reading Speed & Quality Checker
Review readability and timing metrics together so you can identify cues that are too fast, too long, crowded or overlapping.
Your subtitle file is processed in your browser and is not uploaded to Voice2Sub.
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Thresholds are adjustable
The defaults are practical starting points. Set limits that match your language, audience and delivery requirements instead of treating one profile as a universal rule.
How to use this tool
- Choose a subtitle file.
- Select the operation and review cue diagnostics or loss warnings.
- Preview the result, then export if this operation provides an output.
Supported input and output
- Input
- SRT · VTT · ASS · SSA · TXT · CSV · JSON · LRC
- Output
- Inspection report · Counts
Questions about this tool
Why do emoji and combining accents affect the counts?
A visible character may contain several code points. Grapheme-aware counts help keep that distinction visible instead of treating every encoding unit as a separate displayed character.
Do my files or text leave this device?
Your source content is processed in this browser, not uploaded for processing. The browser may download a processing engine from Voice2Sub’s CDN. Those engine requests do not contain your source file.
Need subtitles created automatically from audio or video?Voice2Sub can transcribe spoken audio when you need a complete subtitle workflow instead of a file utility.
Download Voice2Sub →