Observed arrival · 2026-11-14

PreviewMaster checks Facebook crops before you post

previewmaster.app Visit website

Editorial interest 75/100 Selection signal · not a rating of the site

A browser-based tool for previewing how image and video assets may appear across Facebook placements and phone models.

Landing page captured for the 2026-11-14 issue.

For: Social media creators checking Facebook image and video placements
Worth noticing: Its device panel lists screen measurements and system-interface dimensions, with parameters labeled as real-device measurements from 2026-11-11.

Field notes

The interface accepts JPG, PNG, WebP, GIF, MP4, MOV, and WebM, and offers aspect-ratio samples plus editable display-name and caption fields. Its controls vary placement, audience, author or viewer perspective, Story source, and playback state; a device panel lists pixel and point dimensions alongside screen-interface measurements. The page labels its device parameters as real-device measurements dated 2026-11-11, while warning that Facebook app updates may change them.

Observed signals

Read the marks

Editorial observations of this landing page, not a rating.

○OpenPublic substance visible

✦PrettyNotable craft visible

◎NicheUnusually specific use

ƒJavaScriptBrowser-side code central

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