Basic rental agreements are available in pdf format from several online sources, including RentalLeaseAgreement.org, TidyForms.com and Nolo.com. Some sources offer more options than others and not all sources are free, but they all provide customizable pdf rental agreements.
RentalLeaseAgreement.org has a wide variety of templates tailored to specific states. It offers residential or commercial template options for leases or month-to-month rentals. Customizable versions of the templates are available for a fee, while blank ones are free.
TidyForms.com has fewer options, but its customizable pdf is entirely free of charge. Nolo.com has a great reputation for legal knowledge. Nolo's state-specific customizabe templates are available for a small fee.