This wepage allows to generate the necessary content for an NFC tag to automatically link to a dolltags.pet page when scanned.
Before you start you will need the Mifare Classic Tool app installed on your phone and a mifare classic tag.
Open the app and select "READ TAG". Click "START MAPPING AND READ TAG". After the tag was read successfully click the 3 dots in the upper left corner and select "Export Dump".
Use the ".mct" option and upload the created file in the input field bellow. Enter the doll ID and click "Generate".
Doll ID:
original dump:
Generate

Download the generated file. Open Mifare Classic Tool again and select "TOOLS". Click "Import/Export/Convert Files" and after that "IMPORT DUMP". Use the ".mct" format again and select the file you downloaded.
After that select "WRITE TAG" in the main menu. Select "Write Dump (Clone)" and click "SELECT DUMP". Select the file you just imported and click "SELECT DUMP" again.
Click "OK" and wait until the tag is written. Done! You can now scan the tag and it should open the dolltags page with the correct id.