Resize Image to 400x600 — Book Cover & Portrait

Quick Answer

400x600 pixels (2:3 ratio) is a common e-book cover thumbnail size used by Amazon Kindle, Google Play Books, and Apple Books. Resize with FileCurve for clean results.

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Frequently Asked Questions

What size is a Kindle book cover thumbnail?

Amazon Kindle recommends book covers with a minimum of 625x1000 pixels and ideal dimensions of 1600x2560. For thumbnails, 400x600 is the 2:3 ratio at reduced size.

Last updated: April 2026

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