Lynne
Level 1
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I am interested in changing the themes of two of my websites in the very near future. One thing that concerns me is that the featured image sizes would then need to change wouldn't they?
How would I go and then change the featured images for so many blog posts? This could take a huge amount of time.
I am sure there is a way to change my featured image sizes without physically uploading new images but what about when the featured image size is quite small, for example for my one there those images are 250*175. If I make those images larger they will look awful.
I am such a dummy when it comes to graphic design so please explain in a very simple way 
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anwebservices
It's true that different theme using different size of images to display in your post. But it doesn't mean that you will need to change anything. It just depend how your current theme is setup and how your future theme will work. Lately most of themes using 100% wide images so it can be responsive and mobile / website / tablet ready. You may test it by switching to new theme for few minutes and see how it look.
In case that you need to change sizes of featured images displaying in your posts, there is some plugins that will help you to resize all thumbnails in one click, will try to find which one works best, so i will let you know. But certainly you won't need to do it one by one manually! WordPress is very advanced CMS and people added many good features for it, there is fix for almost any problem you can have. While working with WordPress (as you probably do) it's always recommended to add large and quality images, probably not less then 800 pixels wide. That's for your future reference :) It's true that different theme using different size of images to display in your post. But it doesn't mean that you will need to change anything. It just depend how your current theme is setup and how your future theme will work. Lately most of themes using 100% wide images so it can be responsive and mobile / website / tablet ready. You may test it by switching to new theme for few minutes and see how it look. In case that you need to change sizes of featured images displaying in your posts, there is some plugins that will help you to resize all thumbnails in one click, will try to find which one works best, so i will let you know. But certainly you won't need to do it one by one manually! WordPress is very advanced CMS and people added many good features for it, there is fix for almost any problem you can have.
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