It is possible to delete posts in bulk using WordPress. You can also delete selected posts in bulk.
Steps to bulk Delete Posts in WordPress
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Log in to the WordPress dashboard.
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From the Dashboard menu, go to Posts and click on All Posts.
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Checkmark the top checkbox to select all posts.
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Click on Bulk Actions and select Move to Trash from the drop-down menu. Then click on Apply.
Your post has been moved to Trash. If you want to delete it permanently, click on Trash and choose Empty Trash.