Caption Line Splitter
Enforce broadcast-style caption rules: at most 2 lines per cue and 42 characters per line. Cues that exceed the limit are split into multiple cues with timing divided proportionally by character count, so the rhythm of the original transcript is preserved.
Split SRT output
// Paste an SRT file above to enforce broadcast caption rules.
How to use this tool
- 01
Upload or paste your SRT
The input cues may have lines over 42 characters or too many lines per cue.
- 02
Run the splitter
Adjust the limits if needed; the summary reports how many cues exceed them and the new total.
- 03
Download the corrected SRT
Re-verify on the video — automatic splits may need light cleanup at sentence boundaries.
Why this matters
Auto-generated captions and AI transcripts routinely produce single cues with five or more lines that flash on and off far too fast to read. Accessibility standards cap captions at two lines of about 42 characters because that's the limit at which a viewer can actually finish reading before the next cue — over-long cues are present but effectively useless.
Splitting cues by hand means recalculating timing for every break, which is tedious and easy to get wrong. This tool divides each over-long cue's duration proportionally so the total caption time is preserved exactly, and runs entirely in your browser. The output is SRT; if you need WebVTT for an HTML5 player, run it through the SRT to VTT Converter.
Related tools
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