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Subtitle Duplicate Remover

Fast. Private. Perfect.

Upload a subtitle file and merge consecutive cues whose text matches exactly after trimming, then download a cleaner result.

Private & Secure
Blazing Fast
Free & Private

Drag & drop your subtitle file here

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SRT, VTT, ASS, SSA, LRC, SBV, TTML, SCC, STL, SMI, TXT, JSON

100% LocalNo UploadSecureInstant

How It Works

1

Upload your subtitle file in any supported format.

2

Each cue's text is trimmed at both ends for comparison.

3

When consecutive cues match exactly, the later cue is removed and the retained cue's end time is extended.

4

Review the merge count and preview the cleaned result.

5

Download the output in the preserved format when available, or SRT as the fallback.

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.

Key Features

Detects consecutive cues whose text matches exactly after leading and trailing whitespace is trimmed
Removes the later cue and extends the retained cue through the duplicate's original end time
Designed for the stuttering back-to-back repeats common in Whisper and auto-caption output
Does not perform a whole-file duplicate scan or fuzzy near-duplicate matching
Case and inline tags are treated as part of the text; there is no similarity threshold
Reports how many cues were merged so the result can be reviewed before delivery
Preserves the input format when reliable round-tripping is available, with SRT as the fallback
Browser-based standard-tool processing with no file uploads

Common Use Cases

Whisper Auto-Captions

OpenAI Whisper often repeats the same line twice in a row. This tool removes those stuttering duplicates instantly.

Translation Cleanup

When copy-pasting produces the same translated line twice in a row, merge the consecutive duplicates.

Merged File Repair

After merging subtitle material, inspect the result and merge any consecutive cues whose text matches exactly.

Broadcast QC

Quality-control teams can use the merge count to check for consecutive repeated lines before delivery.

Frequently Asked Questions

For this tool, a duplicate means two consecutive cues whose text matches exactly after leading and trailing whitespace is trimmed. It does not search the whole file for later repeats or near matches.

The retained cue keeps its original start time and its end time is extended to the later duplicate's end time. Other cues keep their original timing.

Yes, completely free with no registration, no watermarks, and no file uploads.

Near-duplicate matching is not available. Only consecutive cues with exactly matching trimmed text are merged.

SRT, VTT, ASS, SSA, LRC, SBV, TTML, SCC, STL, and SMI. Output preserves the input format when reliable round-tripping is available; otherwise it falls back to SRT.

Yes. Everything runs client-side in your browser. No subtitle data is ever sent to a server.

Ready to convert your subtitles?

Upload a subtitle file and merge consecutive cues whose text matches exactly after trimming, then download a cleaner result.