A fixed price is fixed only for the scope you write down. This template is built around that: a list of deliverables the client can check, one total, half on signing and half on delivery, and terms that say what happens when the client asks for something that isn't on the list.
Use it when every deliverable can be listed, such as a brochure site, a brand identity or a defined shoot. When the requirements are still moving, a fixed price forces you to pad the quote; sell a paid discovery phase first, or split the work into milestones.
The PDF is free and needs no account. Sending it as a link instead adds read tracking and a tamper-evident e-signature — free plan, no credit card.