How to keep metadata when heif2jpg using nconvert/xnconvert

[xnaha2026]

xnconvert and xnview is good tool, i used a lot,
but when i convert heic image to jpg file, xnconvert and xnview can keep all metadata in dest file,
but command line tool nconvert lost all metadata(exif, iptc..), how can i keep metadata when using nconvert,
i need handle a lot of photos , prefered using command line tool in my script,

thanks.

[xnview]

Which command do you use?

[xnaha2026]

Which command do you use?

just normal use, cmd: nconvert -quiet -overwrite -opthuff -keep_icc -no_auto_ext -out jpeg -o test.jpg -q 80 -resize longest 3200 test.heic
but I processed many images, metadata all lost when heic2jpg, how to keep metadata when heic2jpg ?

[xnaha2026]

Which command do you use?

I uploaded test files (all same), you can choose one to download to check:

https://filebin.net/i20b3b36zd5956wj
https://gofile.io/d/lGJAAt
https://limewire.com/d/WCJtW#cHfQUgPHFL
https://postimg.cc/gallery/Lm8bbW6

and here are command results:

❯ nconvert -quiet -overwrite -opthuff -keep_icc -no_auto_ext -out jpeg -o test.jpg -q 80 -resize longest 3200 test.heic

❯ exiftool -ImageSize -Make -Model -DateTimeOriginal .\test.HEIC
Image Size : 3072x4096
Make : Xiaomi
Camera Model Name : Xiaomi 14
Date/Time Original : 2026:01:01 16:13:08

❯ exiftool -ImageSize -Make -Model -DateTimeOriginal .\test.jpg
Image Size : 2400x3200

❯ nconvert -quiet -no_auto_ext -out jpeg -o test2.jpg -q 80 -resize longest 3200 test.heic

❯ exiftool -ImageSize -Make -Model -DateTimeOriginal .\test2.jpg
Image Size : 2400x3200

[xnview]

right, will be fixed.