If you look here: http://codex.wordpress.org/Function_Reference/the_post_thumbnail you will see that you can change the alt. You have to add an array with the value for the alt in the second parameter like so: <?php the_post_thumbnail('thumbnail', array( 'alt' => false )); ?>
Related Posts:
- How To Delete Desired Image Sizes From wp-content/uploads?
- How can I upload video, generate thumbnail and convert to different formats?
- Thumbnails of same size with different crop
- How to Replace YouTube Videos with a “Click to Play” Thumbnail?
- image_resize in wp3.5 change to wp_get_image_editor and wont work
- Why is wp_get_attachment_image_src returning wrong dimensions? [duplicate]
- Stop wordpress from creating multiple size images
- Completly disable and remove Thumbnails?
- Store thumbnails and uploads in different directories?
- Getting specific image thumbnail urls of attached images
- wp_get_attachment_image() not working when trying to add width and height attributes
- WordPress 3.5 – Add custom image size
- Thumbnail is corrupt but image is good
- Thumbnails are not cropped even after selecting “Crop thumbnail to exact dimensions”
- Various thumbnail sizes for WordPress/jquery masonry gallery
- Detect if image file is a thumbnail
- Setting default thumbnails size & creating multiple thumbnail sizes
- Add_image_size not cropping
- Media Gallery Upload Thumbnail Compression is Changing Image Hue
- Custom image sizes only for thumbnails
- How to disable multiple thumbnail generation?
- Use ‘medium’ size with catch_that_image() function
- How can I get I get the thumbnail custom size dimensions?
- prevent wordpress from creating thumbnails of an image
- ‘Thumbnail’ and ‘Medium’ Image sizes are different than expected
- How to link to featured image to media file URL
- Open Image Thumbnail in a new page, while clicking on the link
- Thumbnails Not generated when sharing on WhatsApp
- Thumbnail position + size
- Why are some thumbnails on their side – but correct when I go to edit image? [closed]
- Is there a way to avoid using add_image_size? Best way to manage images
- Single-post preview repeats thumbnails in Jupiter Recent Posts widget
- How to fit image to Thumbnail canvas size?
- How to have the thumbnail cropping tool working
- Regenerate thumbnails for images that are not in the media library
- How can i make this in the_post_thumbnail?
- Custom image size mixes width and height in output
- Why are thumbnails not being generated for PDF files?
- Image Sizes/Thumbnails not generating on local install Ampps
- Thumbnail generating and posting
- Timthumb not working with WordPress 4.0
- the_post_thumbnail returns full sized image, how to debug?
- Disabling image thumbnails and automatic regeneration
- add youtube thumbnail in index and single.php add video
- Exclude Multiple Post Thumbnails From Post Attachments
- Custom thumbnail crop offsets
- How can i place square Feature Image withing the body of post aligned top left or top right in wordpress?
- Can’t add thumbnail theme support
- Error 500 in loop to create posts and thumbnails
- How to reduce unnecessary thumbnail creation?
- thumbnail crop not working
- Best way to manage theme images
- how to place ELSE on if function on multipostthumbnails? [closed]
- add_image_size cropping changes on Mobile devices
- external url for post thumbnail and title
- Generate thumbnails like 500px.com
- Serving resized images on a responsive site without making 2x copies
- Thumbnails resized and not cropped in the center
- How to delete post thumbnails in index page? (twenty fourteen theme)
- get_intermediate_image_sizes() returning different values depending on is_admin()
- Display thumbnail of child, parent and ancestor using featured thumbnails
- Retrieve image from Open Graph of an external URL and set as featured image
- Media Library Image Sizes in Bones theme (add_image_size)
- Check if custom thumnail size image has been cropped to the correct dimensions
- Thumbnail Look For WP
- Can’t edit thumbnails
- get_the_term_list & url
- Thumbnails from video posts not working after upgrading to WP 3.4
- Thumbnail informations (meta)
- How can I add a featured thumbnail into a div via a data-image-src?
- Thumbnails loading forever
- How to crop thumbnail size, from both width and height sides
- Getting post-thumbnail hentry category-error – How can I fix
- Generating Thumbnails for video
- Adding a photo to each WP user
- Adding uploaded images to editor from metabox instead of default popup uploader
- No srcset for hard-cropped thumbnails
- Disable Linked Gallery Images If Mobile Browser
- Getting blank thumbnails in media library?
- Save image as featured image
- Thumbnails produce unwanted gray pixels on white background [closed]
- Implementing a tricky wordpress menu (nested categories + thumbnails)
- Image thumbnails not available post migration, but still accessible via direct URL – DB issue
- Get ID of featured image using “get_post_thumbnail_id(the_ID())” – without printing to screen?
- Remove product category placeholder image (Woocomerce)
- Custom Walker for wp_list_categories
- How do you alter the default WordPress thumbnail?
- get_post_thumbnail_id() Doesn’t return value [closed]
- Gallery with thumbnail carousel
- Admin – no Featured image choice in create new/page|post
- Stop WordPress compressing images? – Quality is terrible
- Using Image Sizes for Custom Post Types outside the Loop
- Thumbnails not being generated for PDF files
- Display Multiple Photos as Featured Image when mouse moves on to it post
- Does WordPress have a way of changing the ‘Natural’ size of uploaded images?
- Create a custom attachment thumbnail for quick page load
- How to set global variable in functions.php
- Why are my ‘medium’ images the wrong size
- Excerpt Problems
- Media Library shows default image instead of image preview