CapsAI

Caption line-length check

SRT Character Limit Checker

Find subtitle lines that may be too wide for comfortable viewing. Choose a maximum character count and inspect every line without changing your original captions.

Browser-basedFree to use

Start with 3 free minutes

Need to Create Subtitles First?

Upload your video to CapsAI, generate editable AI subtitles, and start with 3 free minutes.

Generate Subtitles for FreeExplore All Subtitle Tools

Tool workspace

No account required · processed locally

Many teams review between 32 and 42 characters per line.

Three steps

How this tool works

  1. 1

    Paste an SRT file into the checker.

  2. 2

    Set your preferred characters-per-line limit.

  3. 3

    Review flagged cue and line numbers.

Useful for

Common workflows

  • Mobile caption QA
  • Broadcast subtitle preparation
  • Consistent visual line length

What it checks

Focused, transparent output

  • Per-line character counts
  • Custom threshold
  • Exact cue and line references

Questions

Frequently asked questions

What character limit should subtitles use?

Many workflows target roughly 32 to 42 characters per line, but the right value depends on font, frame and platform.

Are spaces counted?

Yes. The displayed line length includes spaces and punctuation.

Does this rewrite long captions?

No. Use the related line-break optimizer when you want an automatically wrapped draft.

Continue your subtitle workflow

Subtitle Line Break OptimizerSubtitle Reading Speed CheckerBrowse all subtitle tools

Related tools

Subtitle Encoding CheckerInspect subtitle text for replacement characters, null bytes, Unicode normalization, BOM markers, and line-ending format before upload.Subtitle Line Break OptimizerRewrap long SRT caption text to a chosen line length. Preserve timing, preview cleaner breaks, and download an optimized subtitle draft.Subtitle Reading Speed CheckerMeasure subtitle reading speed by characters per second and words per minute. Flag SRT cues that exceed your selected CPS limit.Subtitle Sync CheckerScan an SRT file for overlapping cues, reversed timestamps, and unusually long captions before importing subtitles into an editor.