Audio Transcriber

Transcribe audio files to text locally in your browser. Powered by Whisper AI. No upload, no server — completely private.

Overview

This tool runs OpenAI's Whisper speech-to-text model directly in your browser using WebAssembly, so your audio files are never uploaded to any server. Drop in MP3, WAV, M4A, OGG, FLAC, WEBM, or MP4 files and get accurate transcripts with optional word-level timestamps — no account required and nothing stored remotely. The Whisper model downloads once and is cached in your browser for offline use on future visits. Batch processing lets you queue multiple files and have them transcribed automatically, one after another.

Key Features

  • Local Whisper AI transcription
  • Multiple file batch processing
  • Model download with live progress
  • Per-file transcription progress
  • TXT download per transcript
  • Language auto-detect or manual selection
  • Optional word-level timestamps
  • Sequential processing for memory efficiency
  • Complete client-side privacy

Common Use Cases

  • Journalists and researchers — Transcribe recorded interviews or field audio privately without sending sensitive source material to a third-party cloud service.
  • Podcast creators — Generate text transcripts from episode recordings to publish show notes, improve accessibility, or repurpose content.
  • Students and academics — Convert lecture recordings or dictated notes into searchable, editable text without a subscription service.
  • Multilingual transcription — Use Whisper's automatic language detection or manually select a language to transcribe audio in dozens of languages.
  • Meeting notes — Transcribe recorded calls or meetings locally without sharing confidential business audio with external APIs.

How It Works
1

1. Upload Audio

Drop one or more audio files, or use the file picker. Supports MP3, WAV, M4A, OGG, FLAC, WEBM, and MP4.

2

2. Choose a Model

Select a Whisper model. Tiny is fastest; Small is more accurate. The model downloads once and is cached in your browser for future use.

3

3. Transcribe

Click Transcribe Audio. Whisper runs entirely in your browser using WebAssembly. Your audio never leaves your device.

Frequently Asked Questions

Is my audio sent to a server?
No. All transcription runs locally using WebAssembly. Your audio never leaves your device.

Does the model download every time?
No. Once downloaded, the Whisper model is cached in your browser and reused automatically on future visits.

How large are the models?
Tiny is ~40 MB, Base is ~74 MB, Small is ~244 MB. Larger models are more accurate but slower and require more memory.

Can I transcribe multiple files?
Yes. Add multiple files to the queue and they will be processed one after another automatically.

What audio formats are supported?
MP3, WAV, M4A, OGG, FLAC, WEBM, and MP4. All formats are automatically converted to the 16kHz format Whisper requires.

What browsers are supported?
Chrome, Edge, Firefox, and Safari with WebAssembly support. Chrome and Edge offer the best performance with WebGPU acceleration.

Can I transcribe in languages other than English?
Yes. You can select a specific language or use Auto-detect to let Whisper identify the language automatically.

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