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When I add image in post, I need to make some thumbnails with several sizes. Maybe someone could tell action or filter to implement this?

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Did you try this codex.wordpress.org/Function_Reference/add_image_size? You can use add_image_size to create images of different sizes – Maruti Mohanty Nov 26 '13 at 18:36
I was using this, but it hasnt crop position. – andys Nov 26 '13 at 19:16
if you have more specific needs, then update your question with more info. you don't mention crop position in the question. – Milo Nov 26 '13 at 21:22

You can use a very useful plugin: Custom Image Size

It will automatically crop your images at your desired sizes.

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Without plugin! – andys Dec 12 '13 at 8:25

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