Can 'optimised iphone storage' low videoquality be restored without iCloud? c

So, I have made many video's that were stored on my phone. Since 'optimise iphone storage' was turned on, they are saved in a low quality. They are not saved to iCloud because I had no internet access.

Now I want to transfer the videos from my phone to a harddrive, so I can delete them and have more space on my phone. Since I still don't have access to internet, I cannot sync / upload the videos on my phone to iCloud. Will the video's from my phone be low quality when I transfer them with a cable to a harddrive? Is there a way I can restore them to the original quality? (without internet)

I would be really grateful for advice on this!

V