As the two comments above said: The Uploaded Image has to be larger than 300px * 300px to get 300px * 300px at the end.
WordPress just scales down Images, but does not scale up Images.
Related Posts:
- How do I use element instead of tags in WordPress post content having webP support?
- Show featured image next to post-teasers in Genesis Framework?
- Errors when uploading images in WP 3.5
- Set size for attachments
- Get all images in post and comments like Twitter before post title
- Issue where WP Featured Image will not display
- Remove Featured Image & All Media Uploaded to the Post
- preg_replace not removed “class”
- how to give multiple post thumbnails to a post
- How to display post title inside thumbnail?
- Only show featured image on exerpt and exclude images in post
- Delete media from the post but keep my featured image and post
- Thumbnails and images in the blog post are not loading
- Blog featured images disappeared on my homepage
- Center crop the feature image
- Add another feature image box
- How to show category image if no featured image is set?
- Set featured image on creating new post
- Latest news mini images
- Import alt text in set_post_thumbnail
- website images getting corrupt automatically
- Post slugs and images cannot have same name?
- Add existing images from Media Library in to custom gallery
- Cropped featured image replaces original image in gallery
- Replace image attributes for lazyload plugin (data-src)
- How do I detach images from posts?
- Download external images if post is publish
- How do I sort (order) the results from `get_children()`?
- upload image in a meta box
- Can I load posts via Ajax?
- How to wrap every image in a post with a div?
- Get post embedded image caption
- how to grab first link in post… and of course call it
- How do I programmatically add an image to a post?
- Delete Post From Front-End and attachment permanently
- Limit function to specific post category
- Post taxonomy from exif data
- Underscores.me retrieve next / previous post thumbnail in post_nav function
- get custom image size
- Why does the Hard Crop option Scale?
- how to replace embedded “full” sized images within a post with the “large” ones
- WordPress Theory Lesson – Image Columns within posts with alignment?
- Batch process: remove first image from post content
- Modify WP_Post before processing
- Get image from post’s gallery
- Image Insert into posts and pages not working after 3.2.1 update
- Admin Notices don’t display on the admin screen for certain post
- How to display featured image without it appearing in post?
- Can I use images as anchor tags with
- creating front end image uploader that uploads images as posts
- List all categories with featured image from post?
- How would one change the default url structure of attachments?
- Gather posts into a cart/lightbox and share with another user
- How to check if single.php has already called the_post_thumbnail function
- Thumbnail Image to go in the post aswell
- Server B handling add_image_size() differently than Server A
- Image with large file size not cropping
- Uploading images in custom post form
- Get URL from all images in a post
- Image behind the post’s title
- Post Title to featured Image ALT
- Show more than 200 images in one post
- How to get all inline images in post content? [duplicate]
- Hide thumbnail if there is a gallery on the post
- Image on rss feed on post
- How to Featured content with images in home page?
- select post preview image from nextgen gallery
- How to show a featured image inside a post in only 1 single category
- Link post images to post
- How to get the next and previous image title from attachment or gallery?
- WordPress as CMS: How to manage/handle images assigned to a post as full-sized background images in a slideshow?
- How to exclude native lazy loading from first image in post content?
- Rewrite image links from attachment id to attachment link
- Aligning images in the wp editor not working. How do i get this to work in custom theme?
- unable to write to the database while uploading images
- Change the size of the featured image for post?
- Display image gallery if more than 1 image
- Post images are not displayed in media library
- Delete attached images from posts
- post thumbnails error
- Schedule image post on download
- How to get all posts in gallery post format template
- How to force regenerate thumbnails in WordPress posts?
- Customizing individual images on posts
- Update all images url imported from HTML pages
- Thumbnail With Next/Prev Links Not Showing Next Post?
- Relative Image Urls in Posts are starting from root – Not from WordPress Address (URL) at General Settings
- How do I get thumbnails?
- Featured Images link to post parent
- Post thumbnail dependant on category
- How do I insert a custom field in a user submitted post?
- Only show posts with image and the correct ammount of posts in loop
- Displaying warning if no featured image has been set – Post Editor
- Get attachment if matches a variable
- $attachment->post_title not displaying title
- Broken images after importing posts and opening in Gutenberg
- Search doesn’t display posts with images
- Displaying all images from a WordPress post (including media library)
- How to move all images in a post to a single gallery for a bunch of posts?
- Inside post image title has been posting as a post title on my main post page