Why does MockupX ask you to sign in before export?

Put it into practice

1. Finish reviewing the composition.
2. Use the sign-in flow presented by the editor.
3. Return to export and verify the selected format and scale.

What this looks like

A detail to keep clear

Editing availability does not mean every export feature is available anonymously.

Using MockupX

MockupX exports PNG and JPEG, with WebP and 2× output available to Pro accounts. Export requires sign-in, and free exports carry a watermark. A transparent background remains transparent only in a format that supports it. Inspect the downloaded file, not only the editor preview.

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.