Add your AMR file
Drop one or more .amr files onto the converter above, or browse for them. They load into browser memory only — nothing is uploaded, so there is no size-based pricing and no server queue.
AMR to FLAC
Re-encoding .amr audio as .flac changes how the sound is compressed and which players will accept it. Free, private, and validated — the file never leaves your browser.
100% private for supported formats
Runs on your deviceConvert supported files
Drop AMR files here
Batch files can each use a different output. Nothing uploads for local conversions.
Working inputs include camera RAW, browser-local audio/video, PDF, CBZ/CBR comics, office documents, ebooks, markup, 3D models, structured text, images, and archives.About converting Adaptive Multi-Rate audio to FLAC audio
Re-encoding .amr audio as .flac changes how the sound is compressed and which players will accept it. An .amr file stores speech compressed with the Adaptive Multi-Rate codec, engineered to squeeze a voice call into a few kilobits per second. Feature phones saved voice notes and MMS clips as .amr, and the format still surfaces in old phone backups and some Android recorder apps.
A .flac file contains audio compressed with the Free Lossless Audio Codec, which shrinks recordings without discarding a single sample. Decoded .flac output is bit-identical to the source, so the format has become the standard for music archiving and high-resolution downloads. For this route the practical draw is genuinely lossless while roughly halving storage and open specification with no royalties anywhere in the chain — balanced against still several times larger than a good lossy encode, which is worth knowing before you commit a large batch.
Why convert AMR to FLAC?
The practical trigger for this conversion is usually a mismatch: with .amr, telephone-grade fidelity: nothing above roughly 3.4 kHz survives. Switching to .flac buys you genuinely lossless while roughly halving storage, which is why it is the better fit for ripping CD collections for permanent archival. Because the conversion runs locally, trying it costs nothing but a few seconds of compute on your own machine.
AMR vs FLAC at a glance
| Aspect | Adaptive Multi-Rate audio (.amr) | FLAC audio (.flac) |
|---|---|---|
| Format type | Lossy — discards detail it judges invisible to shrink files | Lossless — every pixel or sample is preserved exactly |
| How it stores data | narrowband AMR samples at 8 kHz, mono only, across bitrates from 4.75 to 12.2 kbps | linear prediction followed by Rice coding typically yields files 40 to 60 percent the size of raw PCM |
| Strongest at | retrieving voicemail exports and call recordings from old handsets | ripping CD collections for permanent archival |
| Weak spot | telephone-grade fidelity: nothing above roughly 3.4 kHz survives | still several times larger than a good lossy encode |
| Metadata | none; the storage format is a bare magic number followed by speech frames, with no tagging structure at all | vorbis comments for tags plus a dedicated PICTURE block for cover art; cue sheets can be embedded for whole-disc rips |
Pick FLAC as the output
Select .flac in the output menu next to each file. The menu only offers targets this engine can genuinely produce, so if FLAC is selectable, the route is real and validated.
Convert on your device
Press Convert. The transcode runs on an FFmpeg engine compiled to WebAssembly, so the audio never leaves your device.
Verify and download
Each result is signature-checked before the download unlocks, so a failed encode can never masquerade as a valid FLAC file. Outputs keep the original filename with the .flac extension.
AMR to FLAC questions, answered
Will converting AMR to FLAC lose quality?
No new loss is introduced — since amr is lossy-oriented and flac is lossless-oriented, everything the .amr file still contains is carried over exactly. What was already discarded by the original lossy encode cannot be recovered, though; converting to .flac does not "restore" quality.
Is it private to convert AMR files here?
Yes — the .amr file is processed inside your browser tab and never uploaded. The transcode runs on an FFmpeg engine compiled to WebAssembly, so the audio never leaves your device. Close the tab and the file is gone from memory.
Where will the FLAC file work?
All major browsers decode .flac, Windows 10 and later plus Android play it natively, and virtually every dedicated audio player supports it. The persistent gap is Apple's Music ecosystem, where converting to ALAC delivers the same audio in a supported wrapper.
Will the FLAC file be bigger or smaller than my AMR?
Larger, sometimes much larger. A lossless .flac must store every pixel or sample the decoder produced, without the perceptual shortcuts .amr used. Use this route for editing headroom, not for saving space.
What happens to the metadata in my AMR file?
This converter strips container metadata deliberately (the FFmpeg command runs with metadata mapping disabled) so exported files do not leak recording details. In the source, none; the storage format is a bare magic number followed by speech frames, with no tagging structure at all; none of it is transmitted anywhere because the file never leaves your browser.