Step 1: Attach your AIFF files using the button above or by bring and position.
Step 2: Click the 'Optimize' button to start the optimization.
Step 3: Collect your converted AAC files.
AIFF to AAC Optimization FAQ
What bitrate does the AAC file use?
+
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.
Will going from AIFF to AAC reduce my audio quality?
+
If AIFF is lossy and AAC is lossless (e.g. MP3 -> WAV), the AAC file is no better than the AIFF — you cannot recover information that was already thrown away. If AIFF is lossless and AAC is lossy, the AAC codec recompresses; at 192 kbps this is transparent for most content.
Can I batch convert hundreds of AIFF files to AAC?
+
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.
Can I normalize loudness in the AIFF to AAC step?
+
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 the AAC play on my car stereo / iPod / Sonos?
+
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.
Is my AIFF file private during conversion?
+
Yes. Uploaded AIFF 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 AIFF to AAC take?
+
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.
Why is the AAC file louder / quieter than the AIFF source?
+
The converter does not change the level: it has no gain or normalize setting. If you hear a difference, your player or media library is probably applying ReplayGain or its own volume levelling on playback; switch that off to hear the AAC as it is.
Can I convert AIFF downloads to AAC?
+
If the AIFF download is unprotected (no DRM), yes. DRM-encrypted streaming files (Spotify, Apple Music) are encrypted at the bit level and we cannot process them. Sources from Bandcamp, SoundCloud, and personal recordings convert fine.
