Click the "Add Books" button in the Calibre toolbar.
Select your desired PDB file.
Click "Open." This will add the PDB file to your Calibre library.
Right click on the PDB file in your Calibre library.
Select "Convert books."
Select "Convert individually."
Select MOBI in the output format drop-down menu.
Click OK. This will begin the conversion process. The converted book will appear in your Calibre library.
Open Hamster Free E-book Converter.
Click "Add Files."
Select the PDB file you wish to convert and click "Open."
Select "mobi" under "Formats and platforms." You can also access the MOBI format option by selecting "Amazon" under the "Devices" section.
Click the "Convert" button.
Select the output destination. Your MOBI file will be saved in this location.
Navigate to Zamzar.com with your Internet browser.
Click "Choose Files..." in the Convert Files tab on the main page.
Select the desired PDB file and click "Open."
Select either "prc" or "mobi" in the Step 2 drop-down menu.
Enter your email address in the Step 3 box. Zamzar will email you a link from which you can download your converted file.
Click "Convert." At the end of the conversion process, you will receive a download link in your email inbox.
Connect your Kindle to your computer.
Locate the PRC or MOBI file on your hard drive.
Copy the file to your computer's clipboard.
Open your Kindle in a file manager window.
Open the "documents" folder.
Paste your PRC or MOBI file in the "documents" folder.