Subtitle Line Breaker
Break subtitle lines the right way: paste a subtitle cue, set max characters per line and max lines, and get clean, readable breaks instantly.
Subtitle Line Breaker
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What is Subtitle line breaker?
Subtitle Line Breaker — Break subtitle lines the right way: paste a subtitle cue, set max characters per line and max lines, and get clean, readable breaks instantly.
Pure greedy/dynamic-programming line-breaking, never AI: punctuation mode walks left to right taking the rightmost break within the limit that follows punctuation, else the rightmost break before a word from a fixed 29-entry conjunction/preposition bank, else the rightmost fitting word; balanced mode uses dynamic programming minimizing squared raggedness with small bonuses for punctuation and conjunction breaks and a per-line penalty against over-splitting. Overlong single words are hard-broken with a warning, CJK-majority text drops to 16 chars/line per Netflix CJK guidance, and text already within limits returns unchanged.
Why use this subtitle line breaker?
Built for subtitle line breaker
Break subtitle lines the right way: paste a subtitle cue, set max characters per line and max lines, and get clean, readable breaks instantly.
Transparent & honest
Algorithmic breaking only — it cannot judge readability or meaning the way a human subtitler can.
Private by design
Everything runs in your browser. Your inputs never leave your device.
Works everywhere
Fully responsive — perfect on desktop, tablet, and mobile. No app needed.
Regularly updated
Regularly maintained and reviewed to ensure accuracy.
Free forever
No accounts, no limits, no watermarks. Use Subtitle Line Breaker as much as you need.
How to use Subtitle Line Breaker
- 1Paste one subtitle cue into the subtitle text box.
- 2Set max characters per line (10-60, default 42) and max lines (1-3, default 2).
- 3Choose a break preference: punctuation (break after punctuation first) or balanced (even line lengths).
- 4Run the breaker to get the broken lines, characters per line, and any warnings.
- 5If it warns that the cue needs more lines than your max, split it into two cues.
What can you do with Subtitle Line Breaker?
- Break subtitle lines automatically — Break subtitle lines the right way: paste a subtitle cue, set max characters per line and max lines, and get clean, readable breaks instantly.
- Srt line length fixer — Break subtitle lines the right way: paste a subtitle cue, set max characters per line and max lines, and get clean, readable breaks instantly.
- Subtitle formatting tool — Break subtitle lines the right way: paste a subtitle cue, set max characters per line and max lines, and get clean, readable breaks instantly.
Good to know
- Algorithmic breaking only — it cannot judge readability or meaning the way a human subtitler can.
- The 29-word conjunction/preposition bank is fixed English; other languages get word-boundary breaks only.
- CJK detection switches to 16 chars/line automatically, overriding your setting with a warning.
- Cues needing more lines than your max are returned in full with a warning to split them — the tool never drops words.
- Same text and settings always produce the same breaks.
How it works
Pure greedy/dynamic-programming line-breaking, never AI: punctuation mode walks left to right taking the rightmost break within the limit that follows punctuation, else the rightmost break before a word from a fixed 29-entry conjunction/preposition bank, else the rightmost fitting word; balanced mode uses dynamic programming minimizing squared raggedness with small bonuses for punctuation and conjunction breaks and a per-line penalty against over-splitting. Overlong single words are hard-broken with a warning, CJK-majority text drops to 16 chars/line per Netflix CJK guidance, and text already within limits returns unchanged.
Examples
First line breaks cleanly after "Hello, world!" — every line stays within 20 characters.
Returns two even lines of 11 characters instead of ragged splits.
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