Audio File Compressor
Reduce audio file size by adjusting bitrate and codec settings.
Drop your file here or click to browse
Supported formats: MP3, WAV, M4A, FLAC, MP4, MKV, MOV, WebM
Processing...
Free · No signup required · 100% client-side processing
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Upload audio or video, or paste a link — AI transcription in 100+ languages with speaker detection. 10 free minutes a day, no signup.
Frequently Asked Questions
audio file compressor runs in your browser: paste a URL, upload a file, or record from your mic. STT.ai picks the AI model and returns the transcript in under 5 minutes. Export as TXT, SRT, VTT, DOCX, JSON, or PDF.
Yes. Every visitor gets 600 free minutes to start on STT.ai, usable for audio file compressor the same as any other workflow. Paid plans starting at $5/month unlock longer files, private transcripts, and priority queueing.
audio file compressor runs on the same AI models as the rest of STT.ai — our best models reach 95-97% accuracy on clean speech (3-5% Word Error Rate on benchmarks). Switch models on the fly if the first pass is below your target.
audio file compressor can run on any of the Whisper models STT.ai hosts — STT.ai Enhanced (Whisper large-v3, most accurate, on paid plans), Whisper Large V3, Whisper Turbo (fast), Whisper Medium and Whisper Small.
Yes. Every transcript exports as SRT or VTT — works 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 built-in editor. Works across all models and languages.
Most audio file compressor jobs finish in under 5 minutes. A 1-hour audio file typically completes in 2-3 minutes with our fastest models. Speed depends on chosen model and current GPU load.
audio file compressor accepts 20+ formats — MP3, WAV, M4A, FLAC, OGG, MP4, MKV, MOV, WebM, AVI, and more. Output to TXT, SRT, VTT, DOCX, JSON, or PDF.
Yes. Audio files submitted to audio file compressor are processed and deleted by default. Pro plans add client-side encryption — even if STT.ai's 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 — all usable for audio file compressor workflows. Free API tier includes 100 minutes/month.
Yes. Every transcript opens in the 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 handles 1,300+ platforms including YouTube, Vimeo, TikTok, SoundCloud, Zoom, Google Meet, podcast hosts, and more. URL transcription works with publicly-available content only — DRM-protected sources can't be transcribed.