Put it into practice
- Inspect the original screenshot at 100%.
- Inspect the downloaded export at 100%.
- Compare the destination's rendered size with the image dimensions.
What this looks like
The exported file is sharp, but the website stretches it beyond its intended width.
A detail to keep clear
Increasing output size without checking the source can create a larger blurry file.
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.
MDN image formats ↗