Step 1: Provide your FLAC files using the button above or by toss and let go.
Step 2: Click the 'Convert' button to start the conversion.
Step 3: Fetch your converted AMR files.
FLAC to AMR Conversion FAQ
How do I convert FLAC audio to AMR without losing quality?
+
Upload the FLAC file and the converter chooses the AMR codec / bitrate combination that matches the source profile. Lossless AMR (WAV / FLAC / ALAC) preserves every sample exactly; lossy AMR (MP3 / AAC / OGG / Opus) defaults to 192 kbps which is transparent for almost all music content. FLAC uses linear prediction plus Rice coding to reach roughly 50-60% of the original size while decoding back to bit-identical PCM. AMR is a narrowband speech codec running between 4.75 and 12.2 kbps, modelling the human vocal tract rather than the full audio spectrum.
How much quality do I lose converting FLAC to AMR?
+
Some, and it is permanent — this is the one direction where information is genuinely thrown away. FLAC holds every sample exactly; AMR discards what a psychoacoustic model predicts you will not hear. At 192 kbps and above that prediction is good enough to be transparent on most material and most equipment. Keep the FLAC as your master, because you cannot get back to it from the AMR.
Will my track titles and album art survive the FLAC to AMR conversion?
+
Not intact. FLAC carries a proper metadata block, but AMR has no standard place for artist, album, track number or cover art, so tags are dropped rather than mangled. Keep the FLAC as the tagged copy, or re-tag afterwards with a tool like Mp3tag or MusicBrainz Picard. AMR destroys music: its 8 kHz bandwidth removes everything above telephone frequencies, and no amount of re-encoding brings it back.
What happens to multichannel audio when converting FLAC to AMR?
+
It is folded down to stereo, because AMR has no practical multichannel mode. The downmix uses the standard coefficients so centre-channel dialogue stays clear and the surrounds are mixed in at reduced level. Anything that depended on discrete channel placement is gone once that happens.
Why does music sound so poor in this conversion?
+
Because one side of it is a speech codec rather than a music codec. It models the human vocal tract and discards everything outside telephone bandwidth, which is fine for a voice memo and destructive for anything with instruments in it. Converting away from it cannot restore the missing frequencies — they were never encoded in the first place. FLAC is still several times larger than a good lossy file, and Apple’s ecosystem only added support recently and grudgingly.
What bitrate does the AMR file end up at?
+
Default 192 kbps for lossy AMR; pass-through for lossless AMR. Override to 320 kbps if you want maximum lossy fidelity, 128 kbps for size-constrained podcast distribution, or 96 kbps for voice-only sources where the smaller file matters more than studio detail.
Will going from FLAC to AMR actually reduce my audio quality?
+
If FLAC is lossy (MP3, AAC) and AMR is lossless (WAV, FLAC), the AMR is no better than the FLAC — you cannot recover information already discarded by the lossy FLAC codec. If FLAC is lossless and AMR is lossy, expect the AMR encoder to recompress; at 192 kbps the loss is imperceptible to most ears.
Does the FLAC to AMR converter keep ID3 / metadata tags?
+
Yes — title, artist, album, year, track number, album art, BPM, replay-gain are read from the FLAC container and written into the equivalent fields on the AMR container. ID3v2 (MP3), Vorbis comments (OGG, FLAC), MP4 atoms (AAC, M4A), RIFF INFO (WAV), iXML chunks all map cleanly. AMR is Adaptive Multi-Rate, the speech codec 3GPP standardised for GSM voice calls and mobile voice recorders.
Can I batch-convert hundreds of FLAC files into AMR?
+
Yes — drop a folder of FLAC files in and we process them in parallel. Premium has more parallel workers and no per-file size cap, so a 500-file batch finishes in minutes rather than tens of minutes. Folder structure is preserved in the output ZIP.
Will the AMR keep the same sample rate as the FLAC?
+
By default yes (a 48 kHz FLAC produces 48 kHz AMR, a 44.1 kHz FLAC produces 44.1 kHz AMR). For specific compatibility — e.g. downsampling 96 kHz studio masters to 44.1 kHz AMR for CD burning, or upsampling 22 kHz voicemail to 44.1 kHz AMR — the sample-rate dropdown applies high-quality SOX-style resampling.
Can I normalize loudness in the FLAC to AMR step?
+
Yes — the loudness-normalize option applies ITU-R BS.1770 / EBU R128 normalization to the AMR output, targeting -14 LUFS (streaming standard) or -16 LUFS (podcast standard) or a custom value. Useful when batch-converting tracks with varying mastering levels into a single AMR playlist.
Will the AMR play on my car stereo / iPod / Sonos / Bluetooth speaker?
+
MP3 plays universally on every device made in the last 20 years. AAC plays on Apple, most Android, Sonos, and modern car stereos. FLAC plays on Sonos and recent Android, less well on older iPods. WAV plays on everything but the file is huge. The device-target dropdown picks a safe AMR codec for the platform you specify. AMR makes voice recordings absurdly small — an hour of speech fits in a few megabytes — and it is what many phones still record calls in.
