Subtitle Line Breaker
Auto-break subtitle lines to Netflix 42-char, BBC, EBU, or custom standards
Input Subtitle
Breaking Options
Split at the word boundary that produces the most evenly-balanced pair of lines.
When to Use Subtitle Line Breaker
Netflix / Amazon Delivery
Streaming platforms require subtitles to follow strict line-length standards. Auto-format your SRT/VTT files to meet the 42-character-per-line requirement before delivery.
Broadcast Compliance
BBC, EBU, and other broadcast standards specify maximum line lengths. Apply the correct limit instantly without manually editing every subtitle cue.
Post-Translation Cleanup
Translated subtitles often have different line lengths than the source. After translation, re-break all lines to fit the target language's character limit.
Mobile Viewing
Shorter lines are more readable on small screens. Use the tool to re-format subtitles with a tighter custom limit (e.g., 32 characters) for mobile-first content.
AI-Generated Subtitles
Auto-generated subtitles from AI tools often produce very long or inconsistently broken lines. Normalize them quickly to a professional standard with one click.
Readability Review
Balanced line breaking ensures no line is awkwardly short or long compared to its pair, improving viewer reading flow and reducing distracting eye movement.
Frequently Asked Questions
What is the Netflix subtitle line length standard?
Netflix requires a maximum of 42 characters per line and no more than 2 lines per cue. This ensures readability across screen sizes and prevents subtitles from blocking too much of the frame. The BBC uses the same 42-character limit, while the EBU standard is 40 characters.
What is Balanced vs Left-heavy breaking?
Balanced finds the word boundary that produces the most evenly-sized pair of lines — e.g., a 60-character sentence becomes two lines of ~30 chars each. Left-heavy fills the first line as much as possible before starting the second. Simple cuts at exactly the character limit regardless of line balance.
What does "Merge Lines First" do?
When enabled, existing line breaks within each cue are removed and all text is joined into one line before re-breaking. Useful when reformatting previously broken subtitles — every cue is re-evaluated from scratch against the new standard.
What if a line still exceeds the limit after breaking?
If a word is longer than the limit, or the text cannot be split within the maximum line count, the tool processes it as best it can and adds it to a warning list so you can manually review those specific cues.
Does the tool change subtitle timings?
No. The line breaker only modifies text content within each subtitle cue. All timestamps, cue IDs, and VTT header data are preserved exactly as in the original file.
Is my file uploaded to a server?
No. All processing happens entirely in your browser using JavaScript. Your subtitle content is never sent to any server, ensuring complete privacy.
Which subtitle formats are supported?
SRT (SubRip Text) and WebVTT are both supported. The tool auto-detects the format and preserves it in the output, including all VTT header blocks, cue IDs, and settings.
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