FLAC to AMR Converter

Convert FLAC to AMR Online

This converts a lossless FLAC master into AMR, the narrowband speech codec built for mobile telephony — so be clear-eyed about the trade-off: you are going from studio-quality, full-bandwidth audio to an 8 kHz mono voice format. Speech survives this well; music does not — AMR's 200–3,400 Hz band throws away most of the frequencies music lives in, leaving anything melodic sounding thin and warbly. The payoff is a dramatically smaller file. Only convert to AMR when something specifically requires .amr — an old feature phone, a voicemail or IVR system, an MMS attachment, or an embedded device. Keep your FLAC as the master; if you just want small music files, convert FLAC to MP3 instead.

How to Convert FLAC to AMR

1. Upload Your FLAC File: Drag and drop your file onto the page or click "+ Add Files" to select it from your computer.
2. Pick the AMR Codec: Under Advanced Options, choose AMR Narrow Band (the standard .amr, 8 kHz, for phones and telephony) or AMR Wide Band if your target device supports 16 kHz wideband speech.
3. Set Sample Rate and Channel (Optional): AMR-NB output defaults to 8000 Hz and Mono — the values the codec requires; leave these unless your device documents otherwise. You can also Trim the clip to keep only the part you need.
4. Convert and Download: Click "Convert" and download your AMR file. No sign-up, no watermark.

FLAC vs AMR — What Changes

Standardized by 3GPP in October 1999, AMR-NB uses eight bitrate modes (4.75, 5.15, 5.90, 6.70, 7.40, 7.95, 10.2 and 12.2 kbit/s). AMR Wide Band (also known as G.722.2) raises the sample rate to 16 kHz and the speech bandwidth to 50–7,000 Hz, which sounds noticeably clearer for voice — but it is still a mono speech codec, not a music format.

Frequently Asked Questions

Will my music sound bad after converting FLAC to AMR?

Yes, if the source is music. AMR is a speech codec that only keeps the 200–3,400 Hz telephone band, so instruments and high frequencies are largely discarded — expect thin, warbly, low-fidelity output. It is the wrong tool for songs. For spoken-word audio (interviews, voice memos, narration) the result is perfectly intelligible and that is what AMR is built for.

Why would I convert lossless FLAC to a low-quality format like AMR?

Almost always for compatibility, not quality. Some systems only accept .amr: older feature phones, certain voicemail and IVR (phone-menu) platforms, MMS attachments, and small embedded devices. In those cases the tiny file size is also a benefit. If you simply want smaller music files that still sound good, use FLAC to MP3 and keep your FLAC as the master.

What is the difference between AMR Narrow Band and AMR Wide Band here?

AMR Narrow Band (AMR-NB) is the classic .amr: 8 kHz sampling, 200–3,400 Hz, the format old phones and telephony systems expect. AMR Wide Band (AMR-WB / G.722.2) samples at 16 kHz with a wider 50–7,000 Hz band, so voice sounds clearer — but the target device or service has to support wideband AMR. Pick Narrow Band for maximum compatibility, Wide Band only when you know it is supported.

Why is the AMR output mono and 8 kHz instead of my FLAC's settings?

Because the AMR-NB codec is defined that way: it is a single-channel, 8 kHz speech format, so the converter downmixes to mono and resamples to 8000 Hz to produce a valid .amr file. There is no stereo or high-sample-rate AMR-NB. If you need to preserve stereo and fidelity, AMR is the wrong target format.

How small will the AMR file be compared to the FLAC?

Much smaller. FLAC typically streams at several hundred kilobits per second, while AMR-NB tops out at 12.2 kbit/s — so a voice recording can shrink by well over 95%. In our testing, a one-minute mono FLAC voice clip of about 5 MB converted to an AMR-NB file under 100 KB. The shrinkage is the whole reason .amr exists; just don't expect music to survive it.

How do you handle my files, and how long are they kept?

Your file is uploaded over an encrypted connection, converted on our servers, and the upload and result are deleted automatically a few hours after conversion. There is no sign-up, no watermark, and files are never shared or made public.