ImageStyles does not create thumbnail image while uploading large images I try to create a website using Drupal on a shared host, everything goes fine except ImageStyles.

When I try to upload large images (more than 1MB) thumbnails does not created , but works fine with smaller one.

I searched it and found these two:

Failing to create thumbnail, medium and large images

Image styles: Does not work with large images

but I can't use these solutions because I'm using a shared host.

Any suggestion will be appreciatived ;)
You can restrict the image upload size using field settings in the admin to less than 1 MB and show a help text that max upload size is 1 MB.

Other option already given by Molot.

Hope it will  help you.