Title: Thumbnails look blurry
Last modified: April 7, 2026

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# Thumbnails look blurry

 *  Resolved [glowmike](https://wordpress.org/support/users/glowmike/)
 * (@glowmike)
 * [1 week ago](https://wordpress.org/support/topic/thumbnails-look-blurry/)
 * My gallery thumbnails look blurry on retina screens, but the full images are 
   sharp. Is there a setting to generate higher-resolution thumbnails or to use 
   a different thumbnail size? I rebuilt thumbnails in WordPress, but it didn’t 
   change the gallery output.

Viewing 1 replies (of 1 total)

 *  Plugin Support [roboalexsupport](https://wordpress.org/support/users/roboalexsupport/)
 * (@roboalexsupport)
 * [1 day, 9 hours ago](https://wordpress.org/support/topic/thumbnails-look-blurry/#post-18879185)
 * In Fusion Grid, thumbnails are generated and displayed based on the layout configuration
   and screen resolution. The gallery automatically detects the device (including
   retina screens) and tries to serve the most appropriate image size.
 * If thumbnails look blurry on retina displays, here are a few things to check:
    1. Image Source Quality
       Make sure the original images are large enough (at least
       2× the display size for retina screens).
    2. Layout Settings
       In Fusion Grid, thumbnail size depends on the column width and
       layout type, smaller thumbnails may look less sharp if the source image is limited.
    3. Image Optimization Plugins
       This is a common cause, some optimization or compression
       plugins may reduce image quality or resize images too aggressively, affecting
       thumbnails. Try temporarily disabling them to test.
    4. Caching
       Clear all caches (browser, plugin, CDN) after any changes.
 * Rebuilding thumbnails in WordPress doesn’t always affect how the gallery generates
   and serves images, since Robo Gallery uses its own logic for responsive rendering.
   If you’d like, send us a link to your gallery, we can check exactly how images
   are being served and suggest the best settings for crisp retina display.

Viewing 1 replies (of 1 total)

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## Tags

 * [gallery](https://wordpress.org/support/topic-tag/gallery/)
 * [thumbnails](https://wordpress.org/support/topic-tag/thumbnails/)

 * 1 reply
 * 2 participants
 * Last reply from: [roboalexsupport](https://wordpress.org/support/users/roboalexsupport/)
 * Last activity: [1 day, 9 hours ago](https://wordpress.org/support/topic/thumbnails-look-blurry/#post-18879185)
 * Status: resolved