Upload your AC3 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 AC3 to M4A a lossy or lossless conversion?
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If both AC3 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 AC3 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 AC3 to M4A conversion?
Does PDF.to support multi-channel (5.1, 7.1) AC3 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 AC3 files to M4A?
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Yes. Drop a whole folder of AC3 files; each becomes a separate M4A and all are zipped for download.
Is the AC3 to M4A converter free?
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Yes, within the free size limit. PRO unlocks much larger files, parallel jobs, and higher bitrates.
