Start with the published baseline
Epic describes an island thumbnail as a still image that makes a viewer want to learn more. The current policy sets a 16:9 ratio, a minimum of 1920×1080 and a maximum file size of 5 MB. Treat those as the export baseline, not the whole creative brief.
- Use the real island as the subject: show a mechanic, environment or moment that players can actually encounter.
- Keep the master at 1920×1080 or larger, then inspect a small Discover-sized preview before publishing.
- Leave a quiet area for the island name only when the title needs to be added later as editable text.
Make one gameplay hook win the browse card
Discover cards are read quickly. Choose one focal subject, one action and one environmental cue that explains the island. A crowded montage can contain more information while communicating less, especially when the thumbnail is reduced on a phone.
Use contrast and silhouette before decorative detail. If the island is a race, show the race; if it is an extraction mode, show the vault, danger and objective instead of a generic Fortnite scene.
Avoid the common policy and visibility traps
A thumbnail can be attractive and still hurt an island if it misleads players or looks copied. Epic’s guidance also warns against imagery that references XP or AFK farming, platform-specific controls, unowned IP or a feature that does not exist in the experience.
- Do not promise weapons, mechanics or locations that are not available and interactable in the island.
- Do not add XP amounts, AFK language, coin-farm claims or platform-specific controller buttons.
- Use original composition and assets you own or are allowed to use; avoid near-duplicate thumbnails across islands.
Prompt an editable production draft
A useful prompt names the island mode, the player objective, the focal action, the environment, the lighting and the negative space reserved for the title. Ask for a clean 16:9 composition and keep important wording out of the generated pixels so you can edit it after the first pass.
Use a representative island screenshot as a reference when the promotional draft must match the playable environment. GUIFoundry’s UEFN workflow can then extend the same palette into HUD frames, counters and lobby graphics.