MP3 to AMR Converter

AUTO-DELETE/Files are processed on our server and deleted as soon as conversion finishes.

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How to Convert MP3 to AMR Online

MP3 to AMR: what changes in the file

This tool takes a MP3 file, processes it with FFmpeg on DownloadVideo.vn servers and returns a AMR file.

Both MP3 and AMR are lossy, so converting adds another generation of compression: a small further loss that is usually hard to notice after one conversion.

How MP3 and AMR differ

Property	MP3	AMR
Full name	MPEG-1 Audio Layer III	Adaptive Multi-Rate (narrowband)
Introduced	Fraunhofer / MPEG, 1993	3GPP, 1999
Compression	lossy	lossy
Strengths	plays everywhere: phones, cars, speakers, browsers; about 1 MB per minute at 128 kbps	tiny files designed for speech: call and voice recordings on older phones
Limitations	lossy: removed detail cannot be recovered; less efficient than AAC or Opus at the same bitrate	8 kHz mono speech codec: music sounds muffled; most computer players cannot open it

Measured with a sample file

On September 26, 2026 we ran the tool on our production server with a sample file: 10 seconds of 44.1 kHz stereo audio (MP3 192 kbps), 236 KB.

Result: 236 KB → 16 KB, processed in 0.5 s. Output: AMR-NB audio at 8 kHz mono, 12 kbps.

Real sizes depend on your content (how complex the picture and sound are, and the length); the figures only show the order of change.

Before you convert

AMR is an 8 kHz speech codec: music will sound muffled, like a phone call. Use it only for spoken recordings.
The tool always re-encodes the picture and sound, even when the source codec would already fit the target format.
Up to 500 MB per file; a conversion that runs longer than 10 minutes is cancelled.
The file is sent to our server for conversion and deleted as soon as processing ends, including when it fails.

Frequently asked questions

Does converting MP3 to AMR reduce quality?

Slightly: it is a second round of lossy compression. One conversion is usually hard to notice, but repeated conversions add up.

Should I convert music to AMR?

No. AMR is 8 kHz mono and designed for speech; music will sound muffled.

How does the file size change from MP3 to AMR?

With our sample file: 236 KB → 16 KB. Your file may differ depending on its content.