Why does changing WooCommerce thumbnail crop remove parts of a tall product?

What the Crop Setting Changes

A tall source image contains more vertical content than a wide catalog thumbnail can display. When the thumbnail uses hard cropping, WooCommerce or the active image-generation process removes pixels outside the target frame. The product is not being squeezed; its top, bottom, or sides are being discarded.

The visible result also depends on three separate measurements: the original image pixels, the generated thumbnail size, and the dimensions of the thumbnail as rendered in the catalog. A mismatch at any of these stages can make the result appear unexpectedly cropped or blurry.

Build a Minimal Test Fixture

Use a non-destructive copy of one owned product asset. Choose a tall product image whose complete outline is easy to recognize, then make a second copy with illustrative padding added to the left and right so the product sits inside a wider canvas. Record the source pixel dimensions for both copies before uploading them.

Do not treat the padded copy as a final merchandising asset yet. Its purpose is to reveal whether the missing content is caused by the hard crop, by an old generated thumbnail, or by the catalog tile applying a separate constraint.

1. Upload the original tall image as a new test image for a test product or non-public copy, and record its filename, source dimensions, and displayed thumbnail dimensions.
2. Upload the padded copy separately and record the same evidence. Keep the two filenames unmistakable so their outputs cannot be confused.
3. View both images in the same catalog context. Compare the generated thumbnail and the rendered tile, not only the full-size product image.
4. Inspect whether the missing area occurs in the generated image itself or only when the catalog tile displays it.

Illustrative exercise

Illustrative exercise: define Asset A as “Tall-Bottle-Original,” an illustrative 1200 × 1800 pixel image with the bottle reaching near the top and bottom edges. Define Asset B as “Tall-Bottle-Padded,” an illustrative 1600 × 1800 pixel image containing the same bottle, with illustrative horizontal padding and no change to the bottle’s pixels. These values are fictional test values, not a report of a tested result.

Compare Asset A and Asset B under the same thumbnail setting. Pass means the complete bottle remains visible in the catalog tile and the evidence identifies which source, generated size, and rendered dimensions produced it. Fail means either asset loses identifiable product edges, or the two filenames appear to use the same stale output despite being separate uploads.

If Asset B passes while Asset A fails, the hard crop is removing the original edges; use a correctly padded source or a thumbnail ratio that accommodates the product. If both fail identically, inspect the rendered tile dimensions and confirm which generated file is being served before regenerating anything.

Branch Before Regeneration

Follow this short sequence: record the old result, upload the two new test assets, compare generated and rendered dimensions, then choose the branch that matches the evidence.

If the new upload displays correctly but the older product remains cropped, old thumbnail sizes may still be present. Treat this as a stale-output problem and regenerate only after confirming the desired crop and testing the new upload. If the new upload is also cropped at the same edge, changing files alone is unlikely to solve it; adjust the source padding or target ratio first.

If the generated thumbnail contains the full product but the catalog tile cuts it, the remaining crop is being applied at render time. Inspect the tile’s displayed dimensions and its image-fit behavior rather than repeatedly regenerating media. Preserve the original source while testing.

1. Choose one branch from the evidence: padded source, target-ratio adjustment, stale generated size, or rendered-tile constraint.
2. Apply the smallest change to the test copy and repeat the same comparison.
3. Accept the change only when the complete product remains visible in the intended catalog tile and the generated output is the one associated with the new upload.

Scope of the documentation

The official references below support tool behavior and feature boundaries. The test fixture, branching decisions and acceptance criteria are Itemlume editorial recommendations; citation does not imply endorsement. Illustrative sizes, names and timings are not your production specifications.