Style-Safe Subtitle Splitter
Fast. Private. Perfect.
Split long subtitle lines at a chosen position while preserving HTML and ASS override tag balance. Tags are closed and reopened automatically.
Drag & drop your subtitle file here
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SRT, VTT, ASS, SSA, LRC, SBV, TTML, SCC, STL, SMI, TXT, JSON
How It Works
Upload a supported subtitle file. Parsed cues are eligible; raw ASS Dialogue: lines are skipped.
Leave the split position at 0 for midpoint splitting, or enter a custom position.
The splitter applies its fixed 60-character minimum before splitting eligible lines.
The splitter finds the nearest word boundary to the split point.
HTML and ASS tags are closed at the end of part 1 and reopened at the start of part 2.
Download the result with perfect tag balance preserved.
Why Choose AllSubConverter?
Your Privacy Matters
Everything runs in your browser. Your files are never uploaded.
Lightning Fast
Optimized processing engine converts files in seconds.
Free & Local
Each file can be up to 50 MB. Batches can contain up to 200 files or 1 GB total.
Works Everywhere
Works on Windows, Mac, Linux, iOS, Android - any modern browser.
What the Style-Safe Splitter Does
Who Needs Style-Safe Splitting?
Styled Subtitle Editing
When editing ASS subtitles with bold, italic, or colored text, splitting a line mid-tag normally breaks rendering. Style-safe splitting keeps everything intact.
HTML Subtitle Repair
VTT and SRT files with HTML tags (<i>, <b>, <u>) need careful splitting. This tool ensures tags are always properly balanced after the cut.
Broadcast Delivery
Broadcasters often require shorter subtitle lines. Split eligible long lines while retaining supported styling tags.
Fansub and Translation
Translation teams often need to break long translated lines into two. Style-safe splitting handles supported styled text while skipping raw ASS Dialogue: lines.
Frequently Asked Questions
When you split a styled subtitle line (like <i>Hello world</i>) in the middle, the style tags would normally break. Style-safe splitting automatically closes the open tags at the end of part 1 and reopens them at the start of part 2, so both halves render correctly.
When the split position is 0, the tool automatically splits at the midpoint of each line. It finds the nearest word boundary to the center so words are never cut in half.
The tool works with supported parsed subtitle cues and skips raw ASS Dialogue: lines. Output preserves the input format where reliable round-tripping is available; otherwise it falls back to SRT.
The minimum is fixed at 60 characters. Shorter lines are left untouched; eligible longer lines can be split at the midpoint or at the position you choose.
Yes. The splitter tracks bold, italic, underline, and strikeout state from ASS override blocks like {\i1} and {\b1}. If a tag is active at the split point, it is reapplied at the start of part 2.
Yes, completely free with no sign-up, no watermarks, and clear file and batch limits. It runs entirely in your browser.