Tools Guides Use Tools →
Format conversion

SubViewer to SRT Converter

Convert SubViewer SUB subtitles to SRT online for free, locally in your browser with no upload.

Free No signup Browser-local

SubViewer SUB input

No signup. No server upload. Browser-only processing.

Drop a subtitle file here or choose one manually

Supports SRT, VTT, and ASS where relevant to the tool.

Selected file: sample.sub

SRT output

Runs locally in your browser

Selected file: sample.sub

Workflow notes

How to use this SubViewer to SRT tool

SubViewer .sub files often come from older subtitle archives and desktop tools. This converter reads start and end timestamp rows, turns [br] markers into SRT line breaks, and exports numbered SubRip cues for editing, upload, and review workflows.

  1. Add a supported subtitle file. Upload or paste a supported subtitle file (.sub, .txt), or load the sample input to see the expected structure.
  2. Run the SubViewer to SRT tool. Use the browser-based converter or repair action to process the subtitle file locally on your device.
  3. Review and download the output. Check the first few cues, the middle of the file, and the final cue before copying or downloading the result.

Input and output checklist

  • Use a complete subtitle file with valid cue timing when possible.
  • Keep a copy of the original file before replacing it in your workflow.
  • Review the first few cues, the middle of the file, and the final cue after export.
  • Test the downloaded output in the destination player, editor, or upload form.

Common mistakes to avoid

  • Using the converter on a MicroDVD frame-based .sub file instead of a time-based SubViewer file.
  • Expecting SRT output to preserve any legacy styling beyond readable line breaks.
  • Uploading the SRT output before validating cue timing and text cleanup.

All processing runs in your browser, so the subtitle or video file does not need to be uploaded to a server. That is useful for client review files, unreleased videos, internal training material, and other caption workflows where the text should stay on your device.

When to use this tool

Use this free SubViewer to SRT converter when an older .sub caption file needs standard SubRip timing for editing, upload, review, or archive handoff.

  • Convert time-based SubViewer .sub subtitles to standard SRT.
  • Move older SubViewer caption files into editors that expect SubRip timing.
  • Create an upload-ready copy from a SubViewer subtitle file.
  • Prepare SubViewer captions for SRT validation, cleanup, or archive workflows.

FAQ

How do I convert a SubViewer SUB file to SRT? +

Open the SubViewer to SRT converter, paste or upload the .sub file, and export time-based subtitle blocks as numbered SRT cues.

What is a SubViewer subtitle file? +

SubViewer is an older time-based subtitle format that usually stores cues as start and end timestamps followed by caption text in a .sub file.

Does SubViewer to SRT preserve line breaks? +

Yes. The converter turns SubViewer [br] markers into regular SRT line breaks and keeps readable caption text.

Are SubViewer files uploaded to a server? +

No. The SubViewer to SRT conversion runs locally in your browser, so the subtitle file stays on your device.