XnView Software

XNView 1.3.1 64-bit
Windows 10



File: https://www.dropbox.com/s/cqzqgcjzyh1s0 ... .HEIC?dl=0

You are using the guetzli jpeg encoder and not the standard jpeg encoder.
The guetzli encoder use the minimum quality level of 84% and is very slow for big files.
Further it uses much RAM for compressing picture files with high resolutions (e.g. camera/android/iphone pictures).
That could be the reason, why you can not use quality 80%.

Please use this one instead:

Thanks it worked!