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AMR to text

AMR to text

Upload an AMR file and get the speech as text. AMR is the old narrowband speech format of phone voice recorders and some call-recording apps; the files are tiny and low in fidelity, but they upload as they are.

Free preview: one file up to 15 minutes and 25 MB, 3 tries a day, no account needed.

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What AMR is

AMR (Adaptive Multi-Rate) was designed for phone calls, so it is built to keep a voice understandable at a very low bitrate: the narrowband version tops out at 12.2 kbps, about 0.09 MB a minute. It samples at 8 kHz, which removes high frequencies and the clarity of consonants. Wideband AMR (AMR-WB) is better but rarer.

Where AMR files come from

  • Older Android voice recorders and some manufacturers' built-in recorder apps.
  • Call-recording apps that save calls as .amr.
  • Voicemail exports and legacy dictation devices.
  • Files shared by MMS on older phones.

What to expect

Recognition has less to work with. Expect more errors on similar-sounding words, names and numbers than from a modern 16 kHz recording. That is a property of the source, not a bug. Read the transcript while listening, and if you can still record again, use a current recorder app set to M4A.

Steps

  1. Copy the .amr file to your computer or phone storage.
  2. Choose it above.
  3. Check names and numbers against the audio, then export.

How it works

  1. Add a recording

    Drop in a video or audio file, choose one from your device, or record from the microphone. Nothing to install.

  2. It transcribes

    Speech becomes timestamped text, with speaker labels when more than one person talks.

  3. Read, fix, export

    Click any line to correct it, then download TXT, subtitles, Markdown, JSON or CSV.

Questions

Can this transcribe phone call recordings?
If you have the call as a file and everyone consented to the recording, yes. Quality depends on how the call was captured. See the phone call guide.
Why is the transcript worse than for my MP3s?
AMR discards detail at 8 kHz, which hurts consonants. It is a limit of the source file.
Do I have to convert AMR first?
No.
Is it free?
Yes — one file up to 15 minutes and 25 MB with no account, up to 3 tries a day. A free account keeps your transcripts in a library and lifts the guest limits; the current limits and paid plans are on the pricing page.
What can I export?
Plain text, timestamped text, SRT, VTT, Markdown, JSON with word timings and CSV, all from the same edited transcript.

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