Security & Privacy
Exactly what happens to your audio and transcripts at every step. No marketing fluff — just how it actually works.
Three Levels of Privacy
Standard
Every user, every plan — including free
- HTTPS (TLS 1.3) for all data in transit
- Audio deleted immediately after processing
- Transcripts stored in our database
- We can read stored transcripts
- Data never sold or used for training
- Delete your data anytime
Private Transcript
Pro+ Available on Pro and Business plans
- Everything in Standard, plus:
- Transcript encrypted in your browser (AES-256-GCM) before saving
- We store only encrypted data — we cannot read it
- Key derived from your password, never sent to us
- ⚠ Audio is still processed on our servers during transcription
Private Cloud / Self-Hosted
Full isolation — from $99/mo
- Audio never leaves your infrastructure
- Transcription runs on your GPU
- No data sent to STT.ai servers
- Air-gapped support available
- True end-to-end privacy
What Actually Happens to Your Data
A transparent, step-by-step breakdown of how your audio and transcript are handled.
Standard (all users)
1
You upload audio or record live
Your file is sent over HTTPS (TLS 1.3) to our GPU server for transcription.
2
Audio is processed in memory
Our AI models transcribe your audio on the GPU. The audio is held in memory during processing — never written to disk — and deleted from memory immediately after.
3
Transcript is stored in our database
The text transcript, timestamps, and speaker labels are saved so you can access them later. We can read this data (this is how search, AI summaries, and sharing work).
4
You can delete everything anytime
Delete individual transcripts or your entire account from Privacy Settings. Deletion is permanent and immediate.
With Private Transcript enabled
Steps 1-2 are the same — your audio must be processed on our servers to generate the transcript. The difference is what happens next:
3
Transcript is encrypted in your browser before saving
After transcription, the result is returned to your browser. Your browser encrypts it with AES-256-GCM using a key derived from your password (PBKDF2, 100K iterations). The encrypted blob is then sent to our servers for storage. We never see or store the encryption key.
4
We store only encrypted data
Our database contains only the encrypted blob. We cannot decrypt it. If our database were breached, your transcripts would be unreadable.
Important: Private transcript protects the stored transcript. During the transcription process itself, your audio is processed on our servers in order to generate the text. If your threat model requires that audio never touches third-party servers, consider Private Cloud or Self-Hosted.
What We Can and Can't See
We CANNOT see (with Private Transcript)
- Your stored transcript text
- Speaker names or labels (stored)
- Timestamps or word-level data (stored)
- Your encryption key or password
We CAN see (even with Private Transcript)
- Your audio during processing (deleted after)
- File name, size, duration (metadata)
- Language detected, model used
- Timestamp of transcription
- Your account info and billing
Technical Details
| Encryption algorithm | AES-256-GCM (authenticated encryption) |
| Key derivation | PBKDF2 with SHA-256, 100,000 iterations |
| IV (nonce) | Random 12 bytes per encryption (never reused) |
| Key storage | Never stored — derived from password on each session |
| Transport encryption | TLS 1.3 (HTTPS) + HSTS (1 year, preload) |
| Audio retention | Processed in memory, never written to disk, deleted immediately |
| Implementation | Web Crypto API (browser-native, no external libraries) |
| Source code | github.com/sttaigit/stt-encryption (MIT license) |
Private Transcript Trade-offs
Private transcript is opt-in because encrypting the stored transcript limits some features:
Works with encryption
- Viewing your transcripts
- Exporting (TXT, SRT, VTT, etc.)
- Downloading
- Editing (decrypted in browser)
Not available with encryption
- Server-side search across transcripts
- AI summaries and chat (server can't read data)
- Public sharing via link
- Team workspace collaboration
Need Audio to Never Leave Your Servers?
Private transcript protects the transcript at rest, but audio still passes through our GPU during processing. If your compliance or security requirements demand that audio never touches third-party infrastructure, these are your options:
Private Cloud
$499/mo
Dedicated GPU server managed by us. Your audio never leaves your isolated environment.
- Dedicated A100 GPU
- Isolated — no shared infrastructure
- Audio processed on your hardware only
- Full API access + SLA
Self-Hosted
$99/mo
Docker image. Your servers. Your GPU. Nothing leaves your network.
- Docker — runs on any NVIDIA GPU
- Air-gapped support — no internet required
- Model updates included
- Full control, full privacy
Our Commitments (All Users, All Plans)
- Audio files are never stored permanently. Processed in GPU memory, deleted immediately after transcription.
- Your data is never used for AI training unless you explicitly opt in via Voice Lab.
- We don't sell your data. Ever. To anyone.
- All traffic encrypted in transit via TLS 1.3 with HSTS.
- Delete your data anytime from Privacy Settings or by deleting your account.
- Encryption code is open-source — audit it yourself (MIT license).
Open-Source Encryption
Our encryption library is fully open-source under the MIT license. Don't trust us — verify the code. No trust required, just math.
View on GitHub | View SourceReady to transcribe securely?
Upload your first file free. Private transcripts available on Pro and Business plans.
Start TranscribingMaiz egiten diren galderak
Igo audio- edo bideo-fitxategia STT.aira. Hautatu nahi duzun AI modeloa eta aukerak, eta egin klik Transkribatu botoian. Zure transkribapena minutu gutxitan prest egongo da. Esportatu TXT, SRT, VTT, DOCX, JSON edo PDF gisa.
Bai! STT.aik 600 minutu eskaintzen ditu doan hilean erabiltzaile guztientzat. Ez da erregistratu behar lehen transkribapena egiteko. Ordainpeko planak minutu eta ezaugarri gehiago dituzte eta $5/hilean hasten dira.
Zehaztasuna aukeratzen duzun AI modeloaren eta audioaren kalitatearen araberakoa da. Gure modelorik onenek %5-7ko hitzen errore-tasa lortzen dute erreferentzia-balioetan, hau da, %93-95+ko zehaztasuna. Audio garbiak eta atzeko planoko zaratak gutxienekoak emaitzak hobeak ematen dituzte.
STT.aik 10 modelo baino gehiago eskaintzen ditu, Whisper Large V3, NVIDIA Canary eta beste batzuk barne. Fitxategi berean modelo desberdinen emaitzak konpara ditzakezu.
Bai. Transkripzioa egin ondoren, esportatu zure transkribapena SRT edo VTT azpitituluen fitxategi gisa. Horiek YouTube, Vimeo eta bideo-plataforma nagusi guztiekin funtzionatzen dute.
Bai. STT.aik automatikoki identifikatzen eta etiketatzen ditu hiztun desberdinak AI hiztun-diarizazioa erabiliz. Modelo eta hizkuntza guztietan funtzionatzen du.
Fitxategi gehienak 5 minutu baino gutxiagotan transkribatzen dira. Ordu bateko audio-fitxategi batek 2-3 minutu behar ditu gure modelo azkarrenekin.
STT.aik 20 audio eta bideo formatu baino gehiago onartzen ditu, MP3, WAV, M4A, FLAC, OGG, MP4, MKV, MOV, WebM eta AVI barne. Esportatu TXT, SRT, VTT, DOCX, JSON edo PDF gisa.
Bai. Audio-fitxategiak prozesatu eta ezabatzen dira transkribatu ondoren. Zure datuak ez dira inoiz entrenamendurako erabiltzen. Bezeroaren aldeko enkriptatzea doakoa da plan guztietan — gordetako transkribapenak enkriptatzen ditu zuk bakarrik duzun gako batekin. Prozesatzean, zerbitzariak zure audioa testu arruntean kudeatzen du. Ikasi gure segurtasunari buruz.
Bai. STT.aik REST API bat eskaintzen du Python eta Node.js SDKekin. Doako mailan 100 minutu/hilabete sartzen dira.
Bai. STT.ai-k transkribapen editore bat dauka, erroreak zuzentzeko, hizlariak izenez aldatzeko eta denbora-zigilua doitzeko.
Transkripzio bakoitzak esteka partekagarri bakarra jasotzen du. Esportatu DOCX edo PDF formatuan posta elektronikorako. Pro planek pasahitz bidez babestutako esteka iraunkorrak eskaintzen dituzte.
STT.aik 1.300+ plataforma onartzen ditu, YouTube, Vimeo, TikTok, SoundCloud eta beste batzuk barne. URLen transkribapenak soilik funtzionatzen du publikoki eskuragarri dauden audio eta bideoekin. DRM-k babestutako edukiak (adibidez, Spotify premium episodeak, Netflix, Disney+, etab.) ezin dira transkribatu. DRM edukietarako, deskargatu fitxategia bereizita eta igo zuzenean.