Subtitle QA Report
Get an overall quality score and a multi-dimension breakdown of your subtitle file, just like a broadcast QC report.
Drag & drop your subtitle file here
Drag and drop subtitle files here or click to browse
What the QA Report Analyzes
Engineered for video editors and localization teams. Helps enforce common subtitle timing rules and formatting.
Subtitle QA Report 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 a QA Report?
Real-world scenarios across video post-production, course transcription, and global localization.
Broadcast Delivery
Attach a QA report to your subtitle delivery package to document timing consistency and formatting health.
Streaming Platforms
Run pre-delivery checks on subtitle timing, line lengths, and reading speeds before submission.
Localization Teams
Add a QA scorecard to translated subtitles so reviewers can prioritize files that need attention.
Fansub Quality Control
Run a QA pass on finished subtitles to catch timing and readability issues before release.
Post-Production QC
Integrate a quick QA check into your subtitle QC workflow before final export and delivery.
Accessibility Audits
Document subtitle quality for WCAG and accessibility compliance reporting.
How It Works
Streamlined end-to-end processing pipeline engineered for speed and precision.
Upload your subtitle file
SRT, VTT, ASS, SSA, LRC, SBV, TTML, SCC, STL, and SMI are supported.
Format Analysis
The QA engine runs the subtitle checker and computes statistics across all cues.
Configuration
Six quality dimensions are scored independently, then combined into an overall score.
Processing
Review the dimension breakdown, issue counts, and a quality summary.
Verify & Export
Export the full report as text, Markdown, or HTML for your delivery package or records.
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
A QA (Quality Assurance) report analyzes a subtitle file across multiple dimensions and produces an overall quality score. It flags timing overlaps, high reading speed, inconsistent durations, over-length lines, empty cues, and encoding risks.
In this tool's scoring model, 90+ indicates a clean file with minimal flagged issues, 75-89 reflects good quality with minor items to review, 50-74 suggests noticeable timing or reading speed issues, and below 50 warrants thorough review. Final platform acceptance depends on each distributor's specific QC rules.
Yes. The full report including the overall score, dimension breakdown, and detailed issues can be exported as plain text, Markdown, or a styled HTML document.
The overall score (0-100) is a weighted average of six dimensions: Timing (25%), Reading Speed (25%), Consistency (15%), Style (15%), Content (15%), and Encoding (5%). Each dimension starts at 100 and is penalized for each issue found.
No. All analysis happens entirely in your browser. Your subtitle files never leave your device.
Input: SRT, VTT, ASS, SSA, LRC, SBV, TTML, SCC, STL, SMI. Export: text, Markdown, or HTML report.
Related Articles
Convert YouTube JSON3 Subtitles to SRT, VTT, or LRC | AllSubConverter
Download YouTube captions as JSON3 and convert them to SRT, VTT, or LRC. Step-by-step guide covering yt-dlp, the JSON3 format, and free online conversion.
Add Pinyin & Furigana to Subtitles | AllSubConverter
Learn how to add pinyin to Chinese subtitles and furigana to Japanese subtitles. AI-powered reading aids for language learners, karaoke, and study materials.