Subtitle readability checker · In your browser
Subtitle readability checker
Inspect reading speed, line length, cue duration and gaps against limits you can adjust for your project.
Drop a file here. Up to 5 MiB of UTF-8 text and 20,000 cues per file. Nothing is saved after reload.
How to use it
Your file, ready for its next step.
- Open your subtitles. Choose a file, paste SRT or VTT, or try the sample. No account needed.
- Choose your changes. Adjust the options and run the tool. Read any warnings before continuing.
- Check and download. Review the output and save a new file. Your original stays unchanged.
Worked example
Subtitle readability checker, in practice.
A 40-character subtitle displayed for two seconds has a reading speed of 20 characters per second. With a 17 CPS limit it is flagged.
Before you download
Adjust the suggested limits to match your project. Check your publishing platform’s subtitle requirements before exporting.
These tools work with existing SRT and WebVTT files. If you need captions from audio, open the video caption editor instead. Files are limited to 5 MiB and 20,000 cues per input. Results stay in this tab until you copy or download them.
Questions
A few useful answers.
Does this shorten my subtitles?
No. It flags cues for review without rewriting or removing spoken words.
Are my files private, and what are the limits?
Processing stays in this browser without an account. Each subtitle input is limited to 5 MiB of UTF-8 text and 20,000 cues. Session recording is disabled here. Closing or reloading the page clears your work.
From video to finished captions
Need the words first?
Generate captions, refine the timing and style your video in ClipSubtitles.