Compress 500 GB of photos & videos into a 64 GB USB — best quality, original, free (ver 3.3.3)
Batch compress images to target size (KBs) with best quality
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Batch compress videos to target size (KBs) with best quality
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Q: [Windows] What to do if “Unauthorized changes blocked” notification appears?
A: The apps needs access to the folder they are trying to modify. Go to Settings > Allowed Apps > Add an allowed app > Optimizer Apps.exe 

Q: [MacOS] What to do if "blocked from use because it is not from an identified developer" notification appears?
A: The apps needs your approval. Go to System Preferences > Security & Privacy > Security > Open Anyway
Q: [MacOS] Why is there no Images Optimizer for the Mac?
A: Images Optimizer is available on Windows and Linux. A Mac version is coming soon. In the meantime, enjoy Videos Optimizer. 
Q: [Linux] Why is there no Videos Optimizer for Linux?
A: Videos Optimizer is available on Windows and Mac. A Linux version is coming soon. In the meantime, enjoy Images Optimizer. 