Step 1: Transfer your M4A files using the button above or by slide and deposit.
Step 2: Click the 'Convert' button to start the conversion.
Step 3: Retrieve your converted AAC files.
M4A to AAC Conversion FAQ
What bitrate will the resulting AAC file use?
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A lossy AAC is encoded at 192 kbps by default. The Audio Quality setting also offers 320 kbps for the best quality and 128 kbps for a smaller file. A lossless AAC (WAV, FLAC) ignores the bitrate and keeps every sample.
Is converting M4A to AAC a second round of lossy compression?
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Yes, and it is worth planning around. Both formats are lossy, so the AAC 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 AAC from that instead avoids the double pass entirely. An M4A holds AAC in most cases, or Apple Lossless (ALAC) when it came from a lossless rip. AAC is lossy but more efficient than MP3, and it handles up to 48 channels natively rather than being bolted onto a stereo design.
Why will some of my M4A files not convert?
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DRM. A subset of M4A files are encrypted by the store or the software that issued them, and encrypted audio cannot be decoded by any converter. Anything you ripped yourself, recorded, or bought without protection converts normally; a licensed purchase will not. M4A hides two very different things behind one extension — lossy AAC and lossless ALAC — and non-Apple hardware support is inconsistent.
Will going from M4A to AAC reduce my audio quality?
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If M4A is lossy and AAC is lossless (e.g. MP3 → WAV), the AAC is no better than the M4A — you cannot recover information already discarded. If M4A is lossless and AAC is lossy, the AAC codec recompresses; at 192 kbps the result is transparent for most content.
Can I batch convert hundreds of M4A files to AAC?
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Several files in one job need a paid plan. Free use is one file per conversion, one conversion an hour. On a paid plan you can add several files to one job, then download each result on its own or all of them in one ZIP.
Will the AAC keep the same sample rate as M4A?
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By default yes — 48 kHz M4A stays 48 kHz in AAC. If you need to downsample for compatibility (96 kHz → 44.1 kHz for CD burning), the sample-rate option applies high-quality resampling in the same encode pass.
Can I normalize loudness when converting M4A to AAC?
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Not in this step. The converter has no loudness setting and leaves the level as it is. To even out the volume, run the finished AAC through a Normalize tool on this site.
Will my AAC play on car stereo, iPod, and Sonos?
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MP3 plays almost everywhere. AAC plays on Apple devices, most Android phones and Sonos. FLAC plays on Sonos and Android but not on older iPods, and WAV plays on nearly everything but makes large files. There are no device presets on this page, so choose the target format your player supports. AAC sounds noticeably better than MP3 below 128 kbps and is the default audio track in MP4, YouTube, Apple Music and broadcast. AAC is patent-encumbered, and a handful of very old players still refuse it where they would accept an MP3.
Is my M4A file private during conversion to AAC?
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Yes. Uploaded M4A files are processed on our own conversion servers, no person reviews them, and they are never shared. The upload and the converted AAC are both deleted automatically about 24 hours after the conversion, which leaves time to download the result. See /privacy/ for the full policy.
How long does converting a 1-hour M4A to AAC take?
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It depends on the size and length of the file. Small documents and images are usually ready quickly. Long videos take the longest, because most video conversions re-encode every frame.
M4A is an audio file format that is closely related to MP4. It offers high-quality audio compression with support for metadata, making it suitable for various applications.
