Preview image cropping can remove the part of a graphic that carries its meaning. A wide promotional image may look complete in an editor and then lose its edge text inside a square preview. The source file is unchanged; the frame is showing only part of it.
This is why a single image should not place a date, price or essential instruction at the extreme border when it will appear in several layouts. The relevant risk is the placement of information, rather than a universal image-size rule.
Try a different frame before adding more text
Consider a sample 1,200-by-800 image. A centered square crop using its full height retains an 800-by-800 region. That removes 200 pixels from each side. A phrase close to the left edge can disappear even though the middle subject stays visible.
Use Image Cropper to inspect a supported image in the shapes you expect to need. Compare the complete image with the crop. Ask whether a person who only sees the crop can understand the message.
On websites, an image's frame can apply fit behavior independently of the source dimensions. MDN's object-fit documentation explains the difference between containing an image and covering a frame. Covering can crop content; containing can leave unused space.
Separate the message from its decorative surroundings
Place the essential information in a region that survives your tested crops. This is a practical design choice for those layouts, not a guaranteed safe zone for every platform. Interfaces and preview shapes can change.
If the graphic needs a large amount of text, consider putting the details in the accompanying page or post instead. A thumbnail has limited space, and even uncropped text can become too small to read. The image can identify the subject while ordinary text carries the complete instruction.
For a portrait, inspect whether the tested crop cuts through a face. For a product image, check whether it removes the feature being described. “Keep everything centered” is too broad when the meaningful part of the image lies elsewhere.
Image Resizer can prepare a required size. Fit preserves the whole image within a box; Fill can crop around the centre; Exact can stretch when aspect lock is off. Canvas Padding and Square Fit can add space around an intact image when the design permits it. The fixed-ratio cropping Guide covers deliberate crop calculations. None of these choices makes a future platform preview predictable.
Upload a review version through the intended publishing workflow and inspect its real preview before releasing it. Check both the image and the surrounding title. A clear title can help, but it should not be required to rescue a graphic whose essential words were cut off.
Retain a source layout that can produce separate wide and square exports. Preparing two deliberate versions is often less work than squeezing every message into one heavily compromised image.