Libre de audio a texto en liña
Converta son en texto coa transcrición con IA. Envíe ficheiros de son, grave co micrófono ou apegue un URL. Máis de 100 idiomas, máis de 10 modelos, máis do 98% de precisión.
1. Enviar o son
Envíe MP3, WAV, M4A, FLAC, OGG ou calquera formato de son. Ata 2 GB.
2. AI Processes Audio
A IA extrae a fala do seu son con detección de falante e marcas de tempo.
3. Obter a súa transcripción
Vexa, edite, descargue ou comparta. Exporte como TXT, SRT, VTT, DOCX ou PDF.
Modelos de son a texto
Escolla o modelo de IA que mellor se adapte ás súas necesidades — ou deixe que escollamos o mellor.
Transcríbe audio en máis de 100 idiomas
Listo para converter o son en texto?
Comezar libre →Preguntas frecuentes
Upload your audio file or paste a URL, pick an AI model, and click Transcribe. STT.ai returns editable text with timestamps and speaker labels — most files finish in under five minutes.
MP3, WAV, M4A, FLAC, OGG, AAC, AMR, and 10+ more are all supported. You don't need to convert between formats first — upload whatever your recorder or app produces.
A little. Lossless formats like WAV and FLAC carry bit-perfect audio, so accuracy is bounded only by the model and speaker clarity. Lossy formats (MP3, M4A) at 128 kbps or higher are effectively identical; very low bitrates under 64 kbps can cost a few points.
Yes. STT.ai includes 600 free minutes per month with no signup for your first file. Paid plans starting at $5/month add longer files, private transcripts, and priority processing.
On clean audio our best models reach 95-97% accuracy (3-5% Word Error Rate). Background noise, overlapping speakers, and strong accents are the main factors that lower accuracy.
Yes. Free users can transcribe up to one hour per file; paid plans extend that to 8+ hours, which covers full-length podcasts, interviews, and audiobooks in a single pass.
Yes. Speaker diarization labels each voice (Speaker 1, Speaker 2, ...) and you can rename them in the editor — works on every supported audio format and model.
Export to TXT, DOCX, PDF, JSON, or SRT/VTT subtitles. JSON keeps machine-readable timestamps and speaker labels; DOCX and PDF are best for sharing and archiving.
Yes. 100+ languages with auto-detection, plus the option to set the language manually. Mixed-language audio is handled by switching mid-file, and you can translate the result afterwards.
Yes. Audio is processed and deleted by default, and Pro plans add client-side encryption so transcripts are unreadable without your key. Nothing is used for training without explicit opt-in.
Yes. Paste a link from any of 1,300+ supported platforms — podcast hosts, SoundCloud, YouTube, and more — and STT.ai fetches the audio directly. DRM-protected sources can't be transcribed.
Yes. The REST API accepts audio files directly, with Python and Node.js SDKs and a free tier of 100 minutes/month. Per-second billing applies beyond the free tier.