You could have downloaded JPEG Compressor 0.4 for Mac from our application library for free. This free Mac application was originally designed by Lis@cintosh. Our antivirus analysis shows that this Mac download is virus free. The software is included in Design & Photo Tools.
From the developer:
JPEG Compressor compresses JPEG pictures to save space. Set the compress level with the slider. Best quality means a larger file while lowest quality means more compression and a smaller file (ideal for web).
You may want to check out more software for Mac, such as JPEG Jackal, Compress PDF or Smart Zipper - Compress, decompress Zip, 7Z, Rar files, which might be similar to JPEG Compressor.
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