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Opus to SRT

Opus to SRT, voice recordings to subtitles

Turn an Opus audio file into an SRT subtitle file on your own computer. SnailText transcribes the speech and writes the SRT with phrase-level timing - no upload and no per-minute meter.

Download for Mac Or for Windows →

Generate SRT and VTT locally, nothing uploaded

No account · Nothing uploaded

Convert Opus to an SRT subtitle file

Opus is a modern open-source audio codec used by WhatsApp voice messages, Discord, Matrix, and many VoIP and podcast tools. SnailText reads the Opus audio, transcribes the speech with the Whisper model, and writes a phrase-level SRT, all on your machine.

You get a standard .srt file ready to use in any subtitle editor or video player. Opus works immediately with no extra codec download.

How to convert Opus to SRT

  1. Open the Transcribe files screen in SnailText.
  2. Add your Opus audio file (or a folder of them).
  3. Choose SRT as the output before you run it.
  4. Run it. The .srt file is saved next to your audio.

Try it on your own files

Download for Mac

Generate SRT and VTT locally, nothing uploaded

Opus to SRT free, without uploading the file

Online Opus-to-SRT tools upload your audio to a server. SnailText does it locally: the file stays on your machine, there is no length limit, and the free tier has no watermark. Opus works immediately with no extra codec download.

If you only want the plain transcript of an Opus file rather than a subtitle file, the Opus to text page covers that. If you need VTT instead of SRT, the Opus to VTT page covers that.

Opus to SRT FAQ

How do I convert an Opus file to SRT?
Install SnailText, open Transcribe files, add your Opus file, choose SRT as the output, and run it. It generates the SRT locally with the Whisper model, no account and no per-minute charge. Opus needs no extra codec download.
Can SnailText transcribe WhatsApp voice messages saved as Opus?
Yes. Export the voice message from WhatsApp as an Opus file, add it to SnailText, choose SRT as the output, and run it. The transcription and subtitle file are generated locally, nothing is uploaded.
What is the difference between Opus to SRT and Opus to text?
Opus to SRT produces a timed subtitle file (.srt) with start and end times per phrase. Opus to text produces a plain transcript with no timestamps. SnailText does both, you just pick the output before the run.
Does SnailText burn the subtitles into the video when I use Opus to SRT?
No. SnailText writes a separate SRT and VTT file and does not hardcode captions into the video. That keeps the subtitles editable and lets you attach them in any player or editor. If you want them burned in, overlay the file in a video editor afterward.

More ways to transcribe and caption

Same format, other output

Opus to VTT →

Subtitle hubs

SRT — other formats

VTT — other formats

All transcription formats →

Generate an SRT from your Opus

Free local subtitle generation, no account needed. SRT and VTT files on Mac and Windows.

Download for Mac Or for Windows →