Free Duplicate Subtitle Remover
Detect and remove duplicate or near-duplicate subtitle entries. Find exact matches, similar text, and overlapping cues with configurable sensitivity.
Upload Subtitles
Upload your subtitle file or paste content directly
Detection Settings
Configure how duplicates are detected
Remove entries with identical text (ignoring formatting tags)
Remove entries with text similarity above threshold
Higher = stricter matching. 80% is recommended.
Only flag similar text if timings are close together
Maximum gap between entries to consider them overlapping.
How to Use the Duplicate Remover
📁 Upload Your File
Upload any SRT or VTT subtitle file, or paste content directly.
⚙️ Configure Detection
Choose detection modes: exact matches, similar text (with adjustable threshold), and timing overlap checks.
🔍 Review Duplicates
See which entries are flagged as duplicates, grouped with kept vs. removed entries and the reason for each detection.
💾 Download Clean File
Download the cleaned subtitle file with duplicates removed and entries properly re-indexed.
Detection Modes
Exact Match
Finds entries with identical text content. Ignores formatting tags and case differences for accurate matching.
Similarity Match
Detects near-duplicates using text similarity analysis. Adjustable threshold from 50% to 100% for fine control.
Timing Overlap
Cross-references text similarity with timing proximity. Only flags similar entries that appear near each other in the timeline.
Frequently Asked Questions
Why do subtitle files have duplicates?
Duplicates commonly appear from: auto-generated captions creating repeated entries, merging multiple subtitle sources, OCR errors during ripping, or editing mistakes. They cause text to flash or repeat on screen.
What similarity threshold should I use?
Start with 80% (the default). Lower values catch more near-duplicates but may flag legitimate similar lines. Higher values are stricter and only catch very close matches.
Which entry is kept when duplicates are found?
The first occurrence is always kept and later duplicates are removed. This preserves the original ordering and timing of your subtitle file.
Can I undo the duplicate removal?
The original file is never modified. You can review all detected duplicates before downloading. If you're unsure, keep your original file as a backup.