To bring your Tumblr content to WordPress.com, go to your WordPress.com blog’s Dashboard (just add
wp-admin to your site address like example.wordpress.com/wp-admin). In the left-hand column of the Dashboard, go to Tools → Import.
Choose the Tumblr importer:
That link will begin the import process. Click the “Connect to Tumblr to begin” button:
You will then be directed to your Tumblr account to connect it to WordPress.com (or to the Tumblr login page if you’re not already logged in at Tumblr):
Once you click Allow, your Tumblr account and WordPress.com account will be connected.