Use a thumbnail test before publishing a mockup

Put it into practice

1. Shrink the exported image to a realistic viewing size.
2. Identify what you notice first without zooming.
3. Simplify copy or enlarge the product if the message disappears.

What this looks like

A detail to keep clear

The full-resolution file can be sharp while still communicating poorly at feed size.

Using MockupX

The editor separates output size from mockup type and layout. After changing a ratio, review every device, crop and text block. These are design decisions rather than automatic guarantees: a layout that works for a wide hero often needs a simpler arrangement on a portrait canvas.

Check the result

Keep the original screenshot, then review the exported file at the size where people will see it. Check the message, the visible interface and the final crop separately. For a handoff, record the destination and the approved file so another person can distinguish the final version from a draft.

References and further reading

Use the official references for format behavior and current destination requirements. The composition advice above is a practical design approach, not a promise of platform approval.