Step 1: Supply your FLAC files using the button above or by haul and lay.
Step 2: Click the 'Convert' button to start the conversion.
Step 3: Get your converted AMR files.
FLAC to AMR Conversion FAQ
What does the FLAC to AMR audio converter do?
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FLAC is lossless audio; AMR is lossy. The converter re-encodes the waveform at a configurable bitrate. The result is much smaller but discards some inaudible frequency content — usually transparent at 192 kbps+.
What bitrate should I pick for AMR?
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320 kbps for archival quality, 256 kbps for transparent listening on most speakers, 192 kbps for streaming, 128 kbps when file size dominates. Below 96 kbps artifacts become audible on percussive content.
Is the FLAC to AMR conversion reversible?
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You can convert the AMR back to FLAC on this site. If either format involved is lossy, the round-trip is not bit-perfect even though it is visually or audibly close.
How much smaller will the AMR be than my FLAC?
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Typically 5-10x smaller for images, 5-15x smaller for audio. Exact ratio depends on the chosen quality level and the content — flat solid-colour images and silent audio compress far more than detailed photos or busy soundtracks.
How much quality do I lose converting FLAC to AMR?
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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. 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.
Will my track titles and album art survive the FLAC to AMR conversion?
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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 exactly is an AMR file?
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A bare run of encoded audio frames with no container wrapped around them. That is why two AMR files can usually be joined by simply putting one after the other, and equally why everything beyond the audio itself — a length, a seek index, cover art — has to be bolted on as a convention rather than being part of the format, so a player often has to read the whole file to work out how long it is. It is about the simplest thing that can be called an audio file, which is exactly why it turns up inside other containers more often than on its own.
What happens to multichannel audio when converting FLAC to AMR?
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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.
Most of my FLAC files came from CDs — does that matter here?
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Only in that the encode already happened once. A FLAC ripped from a disc was compressed at whatever bitrate the ripper was set to years ago, and that is the ceiling on everything downstream — converting cannot recover what the ripper discarded. If the discs are still on a shelf, re-ripping to a lossless format and encoding from that gives a genuinely better result than any conversion of the existing files. FLAC is the Free Lossless Audio Codec, an open format from 2001 that compresses without discarding a single sample.
Is FLAC free to use and distribute?
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Yes, without conditions worth worrying about. The specification is public, anyone can implement an encoder or decoder without asking or paying, and nobody can change those terms later — which is why it turns up in open-source tooling, in game engines and anywhere a licence negotiation would have killed the project. Converting away from it does not undo that; the files you already have stay exactly as usable as they were.
Is there a file-size limit when converting FLAC to AMR?
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Anonymous uploads are capped at a generous default; signed-in free accounts get a higher cap, and Pro accounts have no per-file limit. Browser memory is usually the practical constraint long before our server-side limits kick in.
Can I batch-convert several FLAC files to AMR at once?
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Yes. Drop or pick multiple FLAC files in one upload — the converter processes them in parallel and returns a ZIP of the AMR results. There is no need to repeat the upload step per file.
