Is there a service for creating site layouts for a T/C designer?

Question

Design

I am interested in a service for schematic planning of a site with the subsequent upload of a layout in .pdf or .png format, etc., for example.

Answer 1

https://wireframe.cc/ is a simple and pleasant service.
These are the schemes (wireframes) obtained.

Answer 2

If you are about prototyping, then in Google any series on request:
online prototyping

Answer 3

Where do such customers come from, I would like at least one such, otherwise I have to read thoughts and knock on a tambourine ...