Upload your AMR file and PDF.to re-encodes it into a M4A container with sensible default bitrate and sample-rate. The M4A download is ready in seconds.
Is AMR to M4A a lossy or lossless conversion?
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If both AMR and M4A are lossless (WAV, FLAC, AIFF), no quality is lost. If M4A is lossy (MP3, AAC, OGG, Opus), audio is re-encoded; we default to a high bitrate (192-320 kbps) for near-transparent quality.
What bitrate does the M4A output use?
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192 kbps by default for M4A where applicable. Use the options panel to pick 96, 128, 192, 256, or 320 kbps depending on whether you want smaller files or higher fidelity.
Are tags (artist, title, album) preserved when converting AMR to M4A?
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Yes. ID3 / Vorbis / iTunes-style tags are mapped across formats. Album artwork is preserved when M4A supports it.
Will sample-rate and bit-depth survive the AMR to M4A conversion?
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هو په تلواله توګه. موږ downsample یا dither نه کوي، پرته له دې چې تاسو د دې لپاره په انتخابونو پینل کې وپوښتئ. د غږ لپاره تاسو کولی شئ د 22 kHz mono ته د فایل اندازه راټیټولو لپاره انتخاب کړئ.
Can I convert a stereo AMR to mono M4A?
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هو — د 'منېو زور' غوراوی ونجول. دا د پوډکاسټونو او غږيزو ميموګانو لپاره ګټور دی چې دوتنه کچ يې نږدې نیمه کړي.
Does PDF.to support multi-channel (5.1, 7.1) AMR files?
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Yes for M4A formats that support multi-channel (AC3, FLAC, Opus). For stereo-only targets, multi-channel audio is downmixed using a perceptually weighted mix.
Can I batch-convert AMR files to M4A?
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Yes. Drop a whole folder of AMR files; each becomes a separate M4A and all are zipped for download.
Is the AMR to M4A converter free?
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Yes, within the free size limit. PRO unlocks much larger files, parallel jobs, and higher bitrates.
