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Hi, would love to know the recommended/optimum image size and resolution (dots per inch) for including within Substack newsletters and for using as the thumbnail

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From our engineers: "This will change when we make design changes to our web layout … but currently the optimal image size for images in posts is at least 1,456px wide. There’s no problem with going a bit wider than that too — we’ll automatically resize the image for you as is appropriate."

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Hey Bailey, Is it required to optimise the image(compression) before uploading? Or Substack does it automatically?

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Yes, this is what I meant by optimum image size, the size of the file.

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Thanks a lot! What about the image quality or resolution?

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Same (boosting so substack sees) - specifically I'm interested in what the aspect ratio is such that the image isn't cropped.

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