Image (user) cache

[NoroHadzi]

Hello,

I regenerated size of around 10000 images to make it smaller. My question is, is there a way to force user to download new images (not from user cache)? Becouse for example, If i dont do force reset cache in my browser, I still see old size of images.

 

Thank you if anybody can help

[NoroHadzi]

I think I solved this by adding ?123 at end of image URL. Can somebody tell me if this is ok (for caching, SEO) ? 

 

Thanks