Auto Invoice Generator from PDFs

I’m a contractor who receives every work order as a text-based PDF. From each of these orders I have to issue three things on my own branded paperwork: a GST invoice, a completion certificate and a matching Excel summary sheet. I already have polished Word and Excel templates for all of them, so the visual layout is locked in.

What I need is a small Windows-friendly .exe that lets me drop in a work-order PDF, automatically pulls out the key text (job number, client name, dates, amounts, GST, etc.) and shows the captured fields on screen. I’ll review or tweak anything that couldn’t be read and then hit “Generate”. The program should merge the confirmed data straight into my templates and instantly give me:

• a finished DOCX invoice
• a completed DOCX certificate
• an XLSX file with the same figures

An intuitive mapping panel—so I can teach the tool where each PDF field goes—and the ability to adjust that mapping later would be ideal. I’m open on the tech stack (Python + PyInstaller, C#, or anything that compiles to a clean .exe) as long as setup is minimal and everything runs offline.

Deliverables I expect at hand-over:
1. Compiled .exe ready to use
2. Source code and brief build steps
3. Short user guide showing the data-review workflow and how to update templates

If you’ve built similar PDF-to-document automations before, this should be straightforward. Let me know your proposed approach and any clarifying questions so we can get moving.