About Subtitle Workbench
Subtitle Workbench is an independent browser-based utility for people working with SubRip subtitle files. It helps explain a file’s structure and timing before a deliberate export. It is not affiliated with a streaming platform or a subtitle standards organization.
What the checker actually does
- Reads common SRT blocks with comma-separated millisecond timestamps.
- Reports malformed timings, impossible intervals, and missing text as blocking errors.
- Separates editorial findings from format errors. Readability thresholds are editable.
- Checks readable cues for timeline overlaps, including long cues that span several shorter ones. Each warning names one intersecting block; it does not list every overlapping pair. Backward start times receive a separate finding. Checking and export preserve the source order.
- Renumbers readable cues and optionally applies one constant millisecond-precision shift. Export is disabled if any block cannot be read.
Content and quality
The tool and guides were created with AI assistance. The examples are original, the arithmetic is reproducible, and the core operations are checked with automated tests. Each guide explains its review criteria and links to the source documentation.
What remains a viewing decision
This page cannot listen to your audio, judge a translation, or inspect subtitle placement. A clean report is not proof of accessibility or delivery compliance. Keep your original file and review exported captions in your intended player.
Current format support
The checker reads UTF-8 SRT files up to 1 MB and 10,000 blocks. The on-screen report shows format errors first, with up to 200 findings per page. Previous and Next reach every finding; totals cover the full accepted file. Editing the source or review settings returns to the first page. WebVTT, ASS, SSA, subtitle images, and automatic speech recognition are outside its current scope. An unsupported file is rejected rather than converted implicitly.
Open the checker · Read the privacy notice
Contact
For bug reports, guide corrections, or privacy questions, email paulkwon.gemini@gmail.com.