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How to Change Thumbnail / Images Sizes

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Best Practices for WordPress Performance

Ensuring your WordPress site loads quickly and efficiently is essential for both user experience and SEO.

One key aspect of this is using properly sized image thumbnails.

Why Thumbnails Matter

Large, high-resolution images (for example, 5000 x 700 px) can slow down your site significantly, especially when multiple large images are displayed on a single page (such as a gallery or property listing). By using optimized thumbnails—smaller versions of your images—you can:

  •  Improve site speed and performance.
  •  Reduce server load and bandwidth usage.
  • Enhance user experience, especially on mobile devices.

WordPress automatically generates multiple thumbnail sizes for each uploaded image based on the theme’s settings.

All WpRentals theme thumbnail sizes can be adjusted via Theme Options, without needing to edit code.

This allows you to tweak dimensions to suit your design needs while keeping the site optimized.

Update Thumbnail Size in Theme Options

  • Navigate to WpRentals > Theme Options in your WordPress dashboard.
  • Locate the Advanced Settings -> Image Settings section.
  •  Adjust the thumbnail dimensions to your preferred size. Adjust Crop option too if you wish.
    • Default size for recent items: 400 x 314 pixels.
    • Note that larger sizes may impact page load speed.
  • Save your changes.

Regenerate Thumbnails

After changing the thumbnail size, previously uploaded images will not automatically resize. To update them:

  1. Install and activate the Force Regenerate Thumbnails plugin.
  2. Go to Tools > Regenerate Thumbnails.
  3. Click the Regenerate All Thumbnails button.
  4. Wait for the process to complete.

Verify Changes

Once the regeneration is complete:

  • Visit your website and check if the new thumbnail sizes are applied.
  • If thumbnails appear unchanged, clear your browser cache and refresh the page.

Additional Considerations

  • Increasing thumbnail size can impact page load times.
  • Test different sizes to find the best balance between quality and performance.

For more details, refer to the Force Regenerate Thumbnails Plugin.

To understand how WordPress Thumbs work, refer to https://developer.wordpress.org/reference/functions/add_image_size/