SUBTITLE QUALITY · MADE READABLE
Subtitle line length checker
Check every line against the 42-character and two-line limits. A focused tool for line width and line count only.
01Your subtitles
No account required. No subtitle content is uploaded.
Why line width matters
A line that runs too long wraps somewhere you did not choose, hides the picture, and is skimmed instead of read. The 42-character and two-line limits come from the Netflix English style guide.
Two limits, one goal
Line length counts every visible character on one line; line count caps how many lines a cue may use. Longest-line reporting shows the widest line even when the whole cue fits.
Fix a long line
Cut filler, split at a natural pause, or move text to a second line with a clean break. Re-break after punctuation and before conjunctions — never between an article and its noun.
Questions editors ask
Which reading speed should I choose?
The reference English presets are based on Netflix's English (USA) guide: 20 CPS for adult programs and 17 for children's programs. Languages and clients use different limits. Set the thresholds required by your project.
Do spaces, tags, and line breaks count?
Spaces and punctuation inside a subtitle line count. Formatting tags are removed. Line-break separators are excluded. Counts use Unicode code points, rather than JavaScript string length; some emoji and combined letters use several code points.
Does CueCheck change my subtitles?
No. It reports potential readability and timing issues. Your original file stays unchanged. The downloadable CSV is a review checklist for your subtitle editor.
Can I check subtitles in another language?
Yes, Unicode text is supported. The provided thresholds are for English, so enter appropriate values for your target language and audience. This tool does not evaluate translation quality.
What information is collected?
Your subtitles and filenames stay local. Anonymous tool-page visits and control clicks help improve the site. You can disable that measurement on the privacy page.