Free AI Speech to Text

Transcribe audio & video to text in 100+ languages. 10+ AI models. Speaker detection. No signup required.

6.1K
transcriptions
166.5K
minutes transcribed
100+
languages
70+
free tools

Works with publicly available audio & video. DRM-protected content is not supported.

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MP3, WAV, M4A, FLAC, MP4, MKV, MOV, WebM — up to 2GB
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Private transcript
Chat with transcript
Unlock with Pro →
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Recording: 0:00
Real-time Vosk (instant)
Enhanced Whisper (accurate)
Public links: 24h, text only · Sign up for 7d + audio · Pro for private links

Real-time speech to text. AI auto-corrects as you speak — accuracy improves with longer speech.

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How STT.ai Works

Three steps to accurate transcription

1. Upload, Record, or Paste URL

Drag and drop any audio or video file (MP3, WAV, MP4, and 20+ formats). Record from your microphone in real-time. Or paste a link from YouTube, Vimeo, TikTok, and 1,300+ platforms.

2. AI Transcribes with Your Choice of Model

Choose from 10+ AI models including Whisper, NVIDIA Canary (#1 accuracy), and Moonshine. Auto-detect language from 100+ options. Speaker diarization identifies who said what.

3. Export, Share, or Integrate

Download as TXT, SRT, VTT, DOCX, JSON, or PDF. Share via link. Use our API to integrate transcription into your app. Perfect for subtitles, meeting notes, podcasts, and more.

100+
Languages Supported
70+
Free Tools
1,300+
Platforms Supported
7
Export Formats

Developer-First API

Integrate speech-to-text into your app in minutes. RESTful API with real-time WebSocket streaming.

REST + WebSocket — File upload and real-time streaming
Multiple models — Whisper, Canary, Enhanced & more
Speaker diarization — Auto-detect who said what
Flexible output — JSON, TXT, SRT, VTT with word timestamps
import requests

response = requests.post(
    "https://api.stt.ai/v1/transcribe",
    headers={"Authorization": f"Bearer {API_KEY}"},
    files={"file": open("meeting.mp3", "rb")},
    data={
        "model": "large-v3-turbo",
        "language": "auto",
        "diarize": "true",
        "response_format": "json",
    },
)

result = response.json()
for seg in result["segments"]:
    print(f"{seg['speaker']}: {seg['text']}")

Ready to transcribe?

Upload your first file free. No credit card, no signup. 600 minutes per month on the free plan.

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Frequently Asked Questions

Upload your audio or video file to STT.ai, paste a URL, or record live. Select your preferred AI model and click Transcribe. Most files complete in under 5 minutes. Export as TXT, SRT, VTT, DOCX, JSON, or PDF.

Yes — STT.ai gives every visitor 600 free minutes/month with no signup required for your first file. Paid plans starting at $5/month unlock longer files, private transcripts, and priority queueing.

Accuracy depends on the model and audio quality. Our best models reach a 3-5% Word Error Rate on benchmarks — 95-97% accuracy on clean speech. The compare-stt tool lets you run multiple models on the same file and pick the best one.

STT.ai offers 10+ models — STT.ai Enhanced (our most accurate), Whisper Large V3 (99 languages), NVIDIA Canary (#1 WER on supported langs), Whisper Turbo (fast), Moonshine (lightweight), and more. Each model page has details.

Yes. Export your transcript as SRT or VTT subtitle files — they work with YouTube, Vimeo, TikTok, VLC, and every major video player. The burn-subtitles tool overlays them onto video as hardsubs.

Yes. Speaker diarization automatically labels each voice (Speaker 1, Speaker 2, ...) and you can rename them in the editor. Works across all models and languages.

Most files are transcribed in under 5 minutes. A 1-hour audio file typically finishes in 2-3 minutes with our fastest models. Speed depends on model choice and current load.

STT.ai supports 20+ input formats — MP3, WAV, M4A, FLAC, OGG, MP4, MKV, MOV, WebM, AVI and others. Output to TXT, SRT, VTT, DOCX, JSON, and PDF.

Yes. Audio files are processed and deleted by default. Pro plans add client-side encryption — even if our database is breached, your transcripts are unreadable without your key. Data is never used for model training without explicit opt-in.

Yes. STT.ai offers a REST API with Python and Node.js SDKs, plus an MCP server for Claude and Cursor. Free API tier includes 100 minutes/month.

Yes. Every transcript opens in our built-in editor where you can correct words, rename speakers, adjust timestamps, and add notes. All changes save automatically.

Every transcript gets a unique shareable URL. Export to DOCX or PDF for email. Pro plans add password-protected and permanent links — useful for client work.

STT.ai supports 1,300+ platforms including YouTube, Vimeo, TikTok, SoundCloud, and more. URL transcription works with publicly-available content only — DRM-protected sources cannot be transcribed.