WordPress Image Sizes

Enter the width and height of the original image and see every format WordPress generates (thumbnail, medium, large and custom). Check which crops are produced and why.

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WordPress automatically generates multiple versions of every image uploaded to the media library, based on the sizes registered by the theme via add_image_size(). Understanding which versions are produced, how crops are handled and what happens when the original is smaller than the requested size is essential for optimising performance and visual quality.
With this calculator you can:
  • View all generated versions for the input sizes
  • Check if crop is enabled and how it affects the cropping
  • Add custom sizes to simulate your theme's add_image_size() calls
  • Understand which sizes are skipped when the original is too small