From the README:

"This is a powerful locally hosted web based PDF manipulation tool using docker that allows you to perform various operations on PDF files, such as splitting merging, converting, reorganizing, adding images, rotating, compressing, and more. This locally hosted web application started as a 100% ChatGPT-made application and has evolved to include a wide range of features to handle all your PDF needs.

Stirling PDF makes no outbound calls for any record keeping or tracking.

All files and PDFs are either purely client side, in server memory only during the execution of the task or within a temporay file only for execution of the task."

"
Full interactive GUI for merging/splitting/rotating/moving PDFs and their pages.
Split PDFs into multiple files at specified page numbers or extract all pages as individual files.
Merge multiple PDFs together into a single resultant file
Convert PDFs to and from images
Reorganize PDF pages into different orders.
Add/Generate signatures
Flatten PDFs
Repair PDFs
Detect and remove blank pages
Compare 2 PDFs and show differences in text
Add images to PDFs
Rotating PDFs in 90 degree increments.
Compressing PDFs to decrease their filesize. (Using OCRMyPDF)
Add and remove passwords
Set PDF Permissions
Add watermark(s)
Convert Any common file to PDF (using LibreOffice)
Convert PDF to Word/Powerpoint/Others (using LibreOffice)
Extract images from PDF
OCR on PDF (Using OCRMyPDF)
Edit metadata
Dark mode support.
Custom download options (see here for example)
Parallel file processing and downloads
API for integration with external scripts
"

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niels