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Whisper AI

AI Audio Transcriber (Convert Speech to Text & Timed Subtitles)

Convert spoken voice recordings, interviews, voice memos, and lectures into clean, editable text and timed SubRip (.srt) subtitles directly in your browser.

Powered by the Whisper neural speech recognition model running entirely on your device via WebAssembly and WebGPU. Your audio files are processed locally and are never transmitted to an external transcription server.

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How It Works (Step-by-Step)

1

1. Select an Audio File

Upload an MP3, WAV, M4A, OGG, WebM, FLAC, or AAC voice recording (up to 15MB and 3 minutes).

2

2. Choose Language

Select the spoken language (English, Spanish, Arabic, French, German) or choose Auto-detect.

3

3. Click Transcribe Audio

Click Transcribe to launch the in-browser neural speech engine and process your audio locally.

4

4. Edit & Export

Review and edit the generated transcript, copy the text to your clipboard, or download TXT and timed SRT files.

Key Features & Advantages

In-Browser Speech AI

Audio decoding and neural inference execute locally in your web browser. Your recordings remain private on your device.

Timed SRT Subtitle Generation

Extracts authentic chunk timestamps from the speech model to produce standard SubRip subtitle files for video editors.

Dedicated Web Worker Isolation

Runs heavy neural processing off the main browser thread, keeping your interface smooth and responsive.

Multilingual Speech Recognition

Optimized recognition for English, Spanish, Arabic, French, and German audio tracks.

Editable Transcript Workspace

Review and edit the transcription directly with live character and word counters before exporting.

No Account or API Key Required

Free to use directly in your browser without sign-up, subscriptions, or third-party cloud fees.

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Frequently Asked Questions

How does the in-browser AI audio transcription work?
The tool uses the OpenAI Whisper speech recognition model compiled to WebAssembly and ONNX Runtime. Your browser decodes the audio into raw waveform samples and feeds them to the neural model locally.
Are my audio recordings uploaded to any cloud server?
No. Your audio file is decoded and transcribed entirely inside your browser memory. No audio bytes or transcripts are sent to any server.
Why is there a file duration limit of 3 minutes?
Because speech neural models are computationally intensive when executed locally in browser memory, a 3-minute limit (up to 15MB) ensures smooth performance without exhausting your device RAM.
How are the SRT subtitle timestamps generated?
The speech recognition pipeline calculates exact start and end timestamps for each recognized audio segment, which are formatted into standard SRT timecodes.
Should I review the transcript before publishing?
Yes. AI speech recognition is probabilistic. Accuracy depends on audio clarity, background noise, accents, and recording quality, so we recommend reviewing the transcript before using it.

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