Subtitle Generation

Generate accurate subtitles and closed captions for video content in multiple languages.

How it works →
Client-side encryption on — your transcript will be encrypted in your browser before being stored. The server processes your audio for transcription, then the result is encrypted locally with your key before saving. (All data is always encrypted via HTTPS in transit.)
Speed varies by platform. Some transcripts are ready in seconds, others may take a few minutes depending on video length.
Drop file here or click to browse
MP3, WAV, M4A, FLAC, MP4, MKV, MOV, WebM — up to 2GB
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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10 free min/day 600 min free with signup No credit card Encrypted
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Why Use STT.ai for Subtitle Generation

Industry-leading accuracy
Choose from 10+ AI models to get the lowest word error rate for your subtitle generation audio. NVIDIA Canary achieves under 6% WER on clean recordings.
Speaker diarization built-in
Automatically identify who said what -- essential for subtitle generation recordings with multiple speakers. No extra setup needed.
Every export format you need
Download transcripts as TXT, SRT, VTT, DOCX, JSON, or PDF. Generate subtitles, meeting notes, or structured data from a single upload.
Free to start, scales with you
600 free minutes per month with no signup. When you need more, paid plans start at $8.33/mo with API access for automation.

How It Works for Subtitle Generation

1

Upload your subtitle generation audio

Drag and drop your recording in MP3, WAV, MP4, or 20+ other formats. You can also record live from your microphone or paste a URL from YouTube, Vimeo, or 1,300+ platforms.

2

AI transcribes your subtitle generation recording

Select your preferred model and language (or let us auto-detect). Enable speaker diarization if your subtitle generation recording has multiple speakers. Processing typically takes seconds to minutes.

3

Export your subtitle generation transcript

Download in your preferred format -- TXT for notes, SRT/VTT for subtitles, DOCX for documents, JSON for integrations. Share via link or use our API for automated workflows.

Export Formats for Subtitle Generation

Every transcript can be exported in the format that fits your subtitle generation workflow:

TXT
Clean plain text -- ideal for notes, searchable archives, and copy-paste
SRT / VTT
Timed subtitles for video platforms, social media, and accessibility
DOCX
Formatted Word document with speaker labels and timestamps
JSON
Structured data with word-level timestamps for developers and integrations
PDF
Print-ready document for sharing, filing, and formal records

Key Features for Subtitle Generation

Srt/Vtt Generation
Timing Optimization
Line Break Rules
Multi-Language Support

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Frequently Asked Questions

Upload your audio or video file to STT.ai. Select your preferred AI model and options, then click Transcribe. Your transcript will be ready in minutes. Export as TXT, SRT, VTT, DOCX, JSON, or PDF.

Yes! STT.ai offers 600 free minutes per month for all users. No signup required for your first transcription. Paid plans with more minutes and features start at $5/month.

Accuracy depends on the AI model you choose and audio quality. Our best models achieve a 5-7% Word Error Rate on benchmarks, meaning 93-95%+ accuracy. Clear audio with minimal background noise produces the best results.

STT.ai offers 10+ models including Whisper Large V3, NVIDIA Canary, and more. You can compare results from different models on the same file.

Yes. After transcribing, export your transcript as SRT or VTT subtitle files. These work with YouTube, Vimeo, and all major video platforms.

Yes. STT.ai automatically identifies and labels different speakers using AI speaker diarization. Works across all models and languages.

Most files are transcribed in under 5 minutes. A 1-hour audio file typically takes 2-3 minutes with our fastest models.

STT.ai supports 20+ audio and video formats including MP3, WAV, M4A, FLAC, OGG, MP4, MKV, MOV, WebM, and AVI. Export as TXT, SRT, VTT, DOCX, JSON, or PDF.

Yes. Audio files are processed and deleted after transcription. Your data is never used for training. Client-side encryption is free on all plans — it encrypts stored transcripts with a key only you have. During processing, the server handles your audio in plaintext. Learn about our security.

Yes. STT.ai offers a REST API with Python and Node.js SDKs. Free tier includes 100 minutes/month.

Yes. STT.ai includes a built-in transcript editor where you can correct errors, rename speakers, and adjust timestamps.

Every transcript gets a unique shareable link. Export to DOCX or PDF for email. Pro plans offer password-protected and permanent links.