Step 1: Supply your AMR 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 WMA files.
AMR to WMA Conversion FAQ
What does the AMR to WMA audio converter do?
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It re-encodes a AMR audio file as WMA. Sample rate and channel count are preserved; the difference is the codec and container.
Will the sample rate and channel layout be preserved?
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By default yes — stereo stays stereo, the original sample rate (44.1 kHz, 48 kHz, etc.) is carried through to the WMA output.
Is the AMR to WMA conversion reversible?
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You can convert the WMA back to AMR on this site. If either format involved is lossy, the round-trip is not bit-perfect even though it is visually or audibly close.
What output quality should I expect from AMR to WMA?
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Default settings target broadcast / web quality — visually identical to the source for most viewers. For archival use, pick the highest quality option in the converter settings.
Is converting AMR to WMA a second round of lossy compression?
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Yes, and it is worth planning around. Both formats are lossy, so the WMA encoder is working from audio that has already been through one psychoacoustic pass, and its own decisions compound the first set. At 192 kbps or above the result is still transparent for most listening. If you have a lossless master anywhere, encoding the WMA from that instead avoids the double pass entirely. 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. WMA is lossy by default, in an ASF container, with lossless and voice-optimised variants that are rarely encountered.
Can I tag the WMA with artist and album information?
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Yes, and it is a genuine gain over AMR, which has nowhere dependable to store any of it. WMA carries title, artist, album, year, track number and embedded cover art in the container itself, so a music library files it correctly without a manual pass. WMA compressed better than contemporary MP3 encoders and remains readable by Windows Media Player and old PlaysForSure devices.
What exactly is a WMA file?
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A container with the audio inside it, rather than the audio on its own. That extra layer is where the length, the seek index and whatever metadata the format defines are kept, so a player knows how long a WMA is before decoding a single frame instead of scanning the whole file to find out. It also means the extension does not always settle what is inside: several containers of this kind are allowed to hold more than one sort of audio, which is why two WMA files can behave differently while looking identical from outside.
Will the WMA play in my car or on older hardware?
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Often not. AMR is decoded by essentially everything, including car head units and elderly players; WMA needs software that knows the codec, which standalone hardware frequently does not have. If the destination is a car stereo or a portable player, that is a strong argument for staying on AMR. WMA is unsupported almost everywhere outside Windows, and older WMA files may carry DRM that blocks conversion entirely.
Is there a licence attached to AMR?
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Not one you have to think about. The codec is covered by patent pools, and the licensing is settled by whoever ships the decoder — the phone, the browser, the operating system — long before a file reaches you. It is why the format is everywhere in hardware, and why royalty-free alternatives were built at all. It changes nothing about converting a file you already have, and it is only a live question if you are shipping an encoder yourself.
Why does music sound so poor in this conversion?
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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. AMR destroys music: its 8 kHz bandwidth removes everything above telephone frequencies, and no amount of re-encoding brings it back.
Is there a file-size limit when converting AMR to WMA?
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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 AMR files to WMA at once?
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Yes. Drop or pick multiple AMR files in one upload — the converter processes them in parallel and returns a ZIP of the WMA results. There is no need to repeat the upload step per file.
