Convert call recordings to text
Upload your file and get an accurate transcript of your call recordings with timestamps in minutes — nothing to install.
Call recordings
About call recordings
Transcribe calls recorded on your phone (M4A, MP3, AMR) or your phone system to have agreements with clients, suppliers or interviewees in writing. Phone audio is lower quality, so it's worth checking names and numbers.
How to record and export a call
- Android: many phones (Samsung, Xiaomi, Google Pixel in some countries) have call recording in the Phone app. Files are saved as M4A, MP3 or AMR in the recordings folder.
- iPhone: since iOS 18.1 you can record a call from the call screen itself; the other person hears a notice and the recording is saved in the Notes app, where you can share it or save it to Files.
- Internet calls (WhatsApp, Teams, Zoom, Meet): usually sound better than a phone line. Use the platform's own recording when available.
How to transcribe it
- 1Upload the recording (M4A, MP3, AMR, WAV…).
- 2Choose the call's language.
- 3Press Transcribe and review the text with the synced audio.
- 4Download as Word to archive it or attach it to the client record.
Quality and accuracy
A classic phone line only carries a narrow band of frequencies, so the voice arrives with less detail than in a normal recording. It transcribes well, but this is where it's most worth checking names, numbers, addresses and dates. Internet calls and good-quality speakerphone recordings give better results.
Before recording: consent
Call recording rules vary a lot between countries and states: in some it's enough for one party to know, in others recording without everyone's consent is prohibited (in Germany, for example, it's a criminal offense). Always tell people you're recording and why, and check the applicable rules if you'll use the recording for professional or legal purposes. For legal work, see also legal transcription.
3 steps
How to transcribe in 3 steps
- 1
Upload your file
MP3, WAV, M4A, MP4, WhatsApp voice notes… up to 5 hours and 2 GB.
- 2
AI transcribes it
Our GPU servers turn speech into text with timestamps.
- 3
Review and download
Edit anything you want and export to Word, TXT or subtitles.
Why Sonorarium
Everything you need to turn speech into text
Human-level accuracy
We run Whisper large-v3 turbo on GPUs, one of the most accurate speech recognition models available.
60+ languages
Automatic language detection, or pick it yourself. Great for English, Spanish, Portuguese and many more.
Really fast
An hour of audio is usually transcribed in just a few minutes.
Export to any format
TXT, Word (DOCX), SRT and VTT subtitles, or JSON with timestamps.
Built-in editor
Listen to the audio in sync with the text and fix any word before downloading.
Private by default
Files are encrypted in transit, automatically deleted after 7 days and never used to train models.
FAQ
Frequently asked questions
Are the two voices in the call told apart?
They aren't labeled automatically yet. In a call between two people it's usually easy to add names while reviewing, with the help of timestamps.
Do you accept AMR files?
Yes. AMR is common in Android call recorders; it's transcribed directly, although its quality is lower than M4A or MP3.
How do I transcribe call recordings to text?
Upload the file above, choose the language (or leave it on automatic) and click Transcribe. In a few minutes you'll have the text with timestamps, ready to copy or download.
Can I transcribe call recordings for free?
You can try it free with 15 minutes, no sign-up. After that, buy minutes whenever you need them — no subscription and no expiry.
Which formats can I download the transcript in?
TXT, Word (DOCX), SRT and VTT subtitles, and JSON with timestamps.
Is my data safe?
Your files are transferred encrypted, deleted automatically after 7 days and never used to train AI models.