Subtitle Reading Speed Checker
Measure characters per second for every subtitle cue and find lines that may be too fast to read.
How is subtitle reading speed calculated?
Characters per second equals visible character count divided by cue duration. This report excludes markup and whitespace from the count and compares each cue with your chosen threshold.
Your result
A little clarity, right here.
Start with your own content or load the example. Your result will appear here.
Three simple steps
How to use Subtitle Reading Speed Checker
Paste your content or choose a supported file.
Adjust the options, then run the tool.
Review the result and copy or download it.
Common questions
Good to know
Understand the result.
Keep the original.
Is this tool free, and are my files uploaded?
This tool is free with no account required. The work happens in your browser. Your input and files are not sent to a processing server.
What are the limits and details?
Reading speed varies by language and audience. The default 20 characters per second is an editable screening threshold, not a universal accessibility standard.
Limits: 500,000 characters per text field; files up to 20 MB each, 10 files and 50 MB total. Processing stops after 30 seconds.