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Transcribe speech from audio (wav/mp3/m4a/flac/ogg/webm/aac) to text, SRT, VTT or JSON using the grok-stt AI model. Up to 10 minutes.
Details
Upload an audio or video file containing speech and the tool transcribes it with x-ai/grok-stt-1.0 through OpenRouter. Long inputs are split near silence into bounded FLAC chunks. Subtitle formats use native word or segment timestamps when the provider returns them; otherwise they use clearly labelled silence-aligned approximate timing. Supports WAV, MP3, M4A, FLAC, OGG, WebM, and AAC. Audio duration follows your plan limit (free tier: 10 min, enforced by the platform). Choose automatic detection or a language hint for better accuracy.
Execution
Fill in the form, run the tool, and review the result in one place.
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Tool usage guide
Audio to Text Transcriber uses the x-ai/grok-stt-1.0 AI model through OpenRouter to convert speech from supported audio or video files into plain text, SRT subtitles, VTT subtitles, or a JSON cue list. It supports files up to 10 minutes, depending on your plan.
Background
A journalist has a short recorded interview in MP3 format and needs a readable draft for writing an article.
Problem
Manually typing the interview would take longer than reviewing an automatic transcript.
How to use
Upload the MP3 file, keep the output format as Plain text, and select English or Auto detect for the language hint.
Outcome
The spoken interview is converted into text that can be reviewed and used as a drafting reference.
Background
A creator has a WebM video with spoken commentary and wants a subtitle file for the video editor.
Problem
The creator needs timed captions instead of a plain transcript.
How to use
Upload the WebM file and choose SRT subtitles or VTT subtitles. Use Auto detect or select the spoken language.
Output format: SRT subtitles; Language hint: English; Maximum chunk duration: 45 secondsOutcome
Supported audio formats include WAV, MP3, M4A, FLAC, OGG, WebM, and AAC. The tool also accepts supported WebM and MP4 video uploads containing speech.
You can export plain text, SRT subtitles, VTT subtitles, or a JSON cue list.
The free tier supports up to 10 minutes, with the applicable duration limit enforced by your plan.
Yes. Choose Auto detect or provide a language hint to help guide transcription.
SRT and VTT outputs use provider word or segment timestamps when available. Otherwise, they use clearly labelled silence-aligned approximate timing.
The tool returns a subtitle file with provider timestamps when available, or clearly labelled approximate timing when they are not.
Background
A research assistant needs to review a recorded lecture and organize spoken sections by timestamp.
Problem
Plain text does not provide a structured list of time-linked cues.
How to use
Upload the supported audio file, choose JSON cue list, and select the appropriate language hint.
Outcome
The transcription is returned as structured JSON cue data for timestamp-based review.