Contracts, invoices and ID scans are exactly the files you should not send to a stranger's server. Modern browsers can read and rewrite PDF files locally, so no upload is needed.
Merging PDFs
Add your files in the order you want, reorder them if needed, and download a single combined document. The PDF merger keeps text selectable and does not re-compress pages.
Splitting and extracting pages
To keep only some pages, enter ranges such as 1-3, 7, 10-12 into the PDF splitter. You get a new file with just those pages in the order you typed them.
Turning photos into a PDF
Scanned receipts and phone photos can be combined into one tidy file with the image to PDF tool, with page size and margins you choose.
A quick privacy check
Open your browser's network tab while using a tool. If no file is sent anywhere, the processing is truly local.