Style
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
Drag and drop subtitle files here or click to browse
What the Style-Safe Splitter Does
Engineered for video editors and localization teams. Helps enforce common subtitle timing rules and formatting.
Style Live Execution Demo
In-Memory Processing
File parsing, mutations, and time shifts for standard tools run in browser memory without sending subtitle files to our servers.
Millisecond Precision
Millisecond-accurate timecode parsing and arithmetic prevent synchronization drift across desktop and web players.
Fault-Tolerant Engine
Automatic multi-encoding detection and syntax sanitization gracefully handle malformed cues and unexpected linebreaks.
Who Needs Style-Safe Splitting?
Real-world scenarios across video post-production, course transcription, and global localization.
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.
How It Works
Streamlined end-to-end processing pipeline engineered for speed and precision.
Upload a supported subtitle file
Parsed cues are eligible; raw ASS Dialogue: lines are skipped.
Format Analysis
Leave the split position at 0 for midpoint splitting, or enter a custom position.
Configuration
The splitter applies its fixed 60-character minimum before splitting eligible lines.
Processing
The splitter finds the nearest word boundary to the split point.
Verify & Export
HTML and ASS tags are closed at the end of part 1 and reopened at the start of part 2.
Delivery
Download the result with perfect tag balance preserved.
Why Choose AllSubConverter?
Client-Side Privacy
Standard tools run in your browser so standard files are not uploaded to our servers.
Fast Local Parsing
Optimized processing engine parses and converts files directly in your browser.
Generous Batches
Up to 50 MB per file, 200 files or 1 GB total per batch.
Universal Compatibility
Runs in modern browsers across Windows, macOS, Linux, iOS, and Android.
More Subtitle Tools
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.
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