Good news for this old question, since WordPress 4.7, pdf’s thumbnail are automatically generated.
Related Posts:
- Uploading Multiple Attachments From Front-End With A Description
- media_sideload_image file name?
- How to add media from front-end to an existing post?
- Creating a multi-file upload form on the front end for attachments
- exposing attachment uploading to the front end — delicate
- How to upload image from front end and save in media library?
- How to delete orphan attachments?
- Getting ID from ajax response of async-upload.php
- rename attachments based on parent-post-title on upload
- How to retrieve alt attribute for an attachment (uploaded image)?
- Show attached media image if no thumbnail image detected
- Email Attachment from Form Submit
- hook wp_generate_attachment_metadata does not read all the attachments
- What is the best way to store thumbnails for a non-image attachment?
- Delete associated thumbnails when calling wp_delete_attachment
- Post Gallery list attachments except the one used as post thumbnail
- Echo list attachment size in post
- Upload multiple image with media_handle_upload with multiple file field [duplicate]
- Undoing define( ‘UPLOADS’, ”.’files’ ); to repoint to “wp-content/uploads” folder
- How to get thumbnail from post attachment in this loop
- How to view exact image dimensions of a media in Admin view?
- wp_delete_attachment doesn’t delete image files / doesn’t work
- How to disable post-thumbnail from generation?
- File was uploaded, but it is not shown on media section of the dashboard
- Using $_FILES variable into the same function for uploading images and files
- How To Retrieve An Image Attachment’s Alt Text?
- How to get attachment file name not attachment URL
- How to cleanly delete attachment but retain original file?
- Validate alt text for attachments?
- Saving images from Gravity Forms repeatable File Upload as post attachments [closed]
- Get all posts (of any post type) an attachment is used in
- get post attachments of a particular size
- Upload images and attachments from frontend form
- attachment url rewrite
- Check if image exists before uploading with media_sideload_image()
- File upload, uploads only file name
- Get the title and URL of the attachment parent post
- Confused with attachment mimetype order
- query attachment images … if no attachments -> get attachments of parent page?
- Replacing with(out) regex link to attachment by links to files
- Getting attachment images is cloning some of them
- Rename attachments during upload no matter what filetype
- Link all WordPress images size
- Insert attachment ID in custom field from media uploader
- Contact Form 7 Data As Attachment [closed]
- Displaying Post Attachment(s) at Top of single.php
- Detach an image from a page using php
- Get the path of the first attached media (single.php)
- Images not being generated at correct size
- custom admin thumbnail for videos, not getting post’s id?
- Custom Gallery HTML only working when images are attached to post/page
- Image Gallery Numbers for 3.5
- How do I link an image to the post it is attached to?
- How to delete a custom file from upload directory when deleting its post
- Auto delete attachments that are older than x days
- Query to only return the 2 newest post attachments (images)?
- Can’t generate thumbnail images
- Clean up images, delete unused image sizes attached to a post type
- problem in uploading attachment to custom directory
- What will happen if I delete all my attachment type posts from database?
- Does wp_get_attachment_image_src also work with non-image files?
- filter get_children to return all mime types EXCEPT ‘x’
- Weird string offset errors when displaying post attachments
- the_time() returning wrong date/time (way in the future)
- WordPress Creates Unused (Unregistered) Image Sizes
- Add audio attachment link to RSS
- Links to my uploads went crazy
- How does WordPress decides how many sizes of an image to create?
- hide attached images of a post
- How to add a caption to an image attachment in a file list?
- Dynamically determine the width and height of a image file to be cropped & uploaded AFTER form submission given fixed aspect ratio
- Upload image and assign it’s id to post
- Possible to add “Even/Odd Classes” to image attachments via wp_get_attachment_image?
- Insert attachments from custom uploader into post (regular uploader style)
- Can’t sort get_posts by post_mime_type
- How can I rewrite old attachment URLs?
- How to list “invisible” Auto Drafts?
- How to add media from front-end to an existing post and edit file title
- how show attachment image in comments query
- How is it possible that a gallery doesn’t have attachment ids?
- Media item permalink goes to source file instead of attachment.php
- Get post attachment with post id
- Display audio file in audio.php
- Display setting ‘size’ not available in image settings modal
- “Could not write file” error in wp_upload_bits function
- Attachment file display link text
- Limit attachment caption characters
- Troubles with code for upload a image
- Get video attachment ID and display length
- missing attachment are showing as 404
- controlling whether upload is attached to post or not
- How do I add Facebook OpenGraph meta tags for attachments in the header for a custom theme?
- Create a custom attachment thumbnail for quick page load
- Add link to attachment for old posts
- Drupal 6 to WordPress migration – media attachments
- Move caption in on attachment page
- Change attachment inside the_content using filters
- Bulk delete media by year
- One audio attachment, with two possible interchangeable extensions
- Attachement Meta DATA