M4AResizer

M4AResizer reduces the size of M4A AAC files and converts M4A ALAC to M4A AAC.

M4AResizer is a program for reducing the size of M4A AAC and ALAC files.

• It works in batch mode - i.e. whole folders can be converted. For those with thousands of files to convert, you can do the whole bunch at once.
• It's multithreaded - i.e. fast, because it converts multiple (depending on your CPU core count) files at a time.
• It copies file info (tags) and cover art to the newly converted file.

Why might you need to reduce the size of AAC files?

• To save space on your portable music player so it can fit more music.
• To save space on the flash disk or CD so you can store more music for your car, or let's say, audio books for your trip. Audio book file size can be drastically reduced since the human speech can be often strongly compressed without noticeable loss of quality.
• You may need to send an ALAC or AAC file to someone over the internet, and it can be useful to reduce the file size if your internet is slow or you pay for traffic.
• You may have to reduce the file size since some forums have a size limit for the file you can attach to a post.

Why might you need to convert ALAC to AAC?

• Lossless audio occupies a lot of space and ALAC is not an exception. It's great if you listen to your lossless music in your quiet home with quality audio, but using so much disk space is unreasonable when listening to music in the car or in the noisy subway. Moreover, most people won't recognize a different between 320 and 256, 192 and even 160 kpbs so you can save more space by selecting 192 or 160 kbps.