Online AMR Converter - Convert Audio to AMR (Speech Codec)

Convert your audio files, especially voice recordings, to the AMR (Adaptive Multi-Rate) format using our free online tool. AMR is optimized for speech coding and used extensively in mobile telephony (GSM, 3G). Convert from WAV, MP3, AAC, etc., to AMR for compatibility or size reduction of voice data. The service is secure (files deleted promptly), free, and requires no user account.

How to Convert Files to AMR Online

Creating AMR files is simple:

Upload Voice/Audio File: Select or drag and drop your source audio file into the upload box above.
Select Output Format: Choose AMR from the 'Convert to:' dropdown list. (Note: AMR exists as AMR-NB (Narrowband) and AMR-WB (Wideband); our converter likely defaults to one, typically AMR-NB unless specified).
Convert: Press the 'Convert' button to start the speech-optimized encoding.
Download: Click the 'Download' button to save your AMR file.

What is an AMR File?

AMR (Adaptive Multi-Rate) is an audio data compression format optimized for speech coding. It was adopted as the standard speech codec by 3GPP in 1999 and is now widely used in GSM and UMTS mobile networks. AMR files typically have the .amr extension.

AMR uses link adaptation to select from one of eight different bit rates based on channel conditions, aiming to maintain acceptable speech quality even in poor network environments. It exists in two main variants:

AMR-NB (Narrowband): Operates at an 8 kHz sampling rate, suitable for traditional telephone-quality speech.
AMR-WB (Wideband): Also known as G.722.2, operates at a 16 kHz sampling rate, providing higher quality, more natural-sounding speech ("HD Voice").

AMR is highly efficient for voice but not generally suitable for music or complex audio due to its speech-focused design.

AMR Features and Use Cases

Speech Optimization: Specifically designed and highly efficient for compressing human speech.
Adaptive Bitrate: Can adjust coding rate dynamically, useful for mobile networks.
Low Bitrates: Operates effectively at very low bitrates (e.g., 4.75 to 12.2 kbit/s for AMR-NB).
Mobile Telephony Standard: The standard codec for 3G calls and often used in Voice over LTE (VoLTE) alongside EVS.
Poor Music Quality: Generally sounds poor when used to encode music or complex audio.
Compatibility: Primarily supported by mobile phones for voice recording and messaging (e.g., audio notes in some apps). Some media players like VLC and FFmpeg can play AMR files.

How to Open an AMR File

AMR files are most commonly encountered from mobile phone voice recorders or messaging apps. Playback support varies:

Mobile Phones: Most smartphones can play AMR files recorded by their native voice recorder or received in messages.
VLC Media Player (Cross-platform, good codec support)
FFmpeg (Command-line tool and library, can decode/encode)
Apple QuickTime Player (May have support, depending on version/OS)
Some specific audio converters or specialized players.

For desktop use, VLC is a reliable option. If compatibility is an issue, converting AMR files to a more standard format like MP3 or WAV might be necessary.

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