SRT to STL Subtitle Converter
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Supports .srt files up to 50 MB
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How It Works
Upload SRT File
Drag & drop or select your .srt file
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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.
About SRT to STL
This converter transforms SubRip (SRT) subtitles into Spruce STL, a plain-text subtitle format used by DVD and legacy authoring tools. The output contains frame-based start and end timecodes, followed by cue text. Multi-line cues are represented with pipe separators.
Input Format
SRTSRT (SubRip) is a plain-text subtitle format using sequential numbered entries with HH:MM:SS,mmm timestamps. Each cue contains a start time, an end time, and one or more lines of dialogue.
Output Format
STLSpruce STL is a text-based subtitle format with lines containing a start timecode, end timecode, and subtitle text. This converter writes SMPTE-style HH:MM:SS:FF values at 29.97 fps and separates multiple cue lines with the pipe character.
Features
Why Convert?
Format Differences
Common Use Cases
DVD Authoring
Prepare subtitle text for DVD authoring tools that accept Spruce STL as an import or intermediate format.
Legacy Tool Interchange
Move SRT content into an older subtitle workstation that expects Spruce STL timing and pipe-separated lines.
Pre-Delivery Review
Use the readable line-based output to inspect cue timing and text before importing into an authoring system.
Multi-Format Distribution
Keep SRT for modern platforms and create Spruce STL for a legacy or DVD-specific workflow.
Related Formats
SRT
SubRip, the universal plain-text subtitle interchange format used as the input here.
SCC
Scenarist Closed Captions, a North American broadcast caption format that also uses frame-based timecodes.
TTML
Timed Text Markup Language, an XML format used by modern broadcast and streaming workflows.
Frequently Asked Questions
It creates Spruce STL, a plain-text subtitle format. It does not create EBU Tech 3264 binary STL. Each cue is written as a start timecode, end timecode, and pipe-separated text.
The converter uses 29.97 fps when writing STL timecodes. If your destination workflow requires a different frame rate, verify whether the resulting timecodes are acceptable before delivery.
No style conversion is performed. The output is plain cue text and timing. HTML-like tags or formatting intended for another player may remain as literal text unless your conversion options remove them.
SRT HH:MM:SS,mmm timestamps are converted to HH:MM:SS:FF timecodes using 29.97 fps. Frame numbers are rounded from milliseconds, so timing is quantized to the nearest output frame.
Line breaks inside an SRT cue are written as pipe separators in STL. Subtitle tools that support Spruce STL can interpret the pipes as separate caption rows.
No. This converter writes Spruce STL text, not EBU Tech 3264 binary STL with GSI and TTI blocks. Do not use the output as an unverified EBU broadcast deliverable.