Free tools accept PDFs up to 100 MB per file. The Image to PDF converter additionally accepts JPG and PNG up to 20 MB per image.
AI tools accept the same PDF range. For OCR, scanned PDFs and image-only PDFs both work.
Word, Excel and PowerPoint conversion is on the roadmap. Today the easiest path is: print to PDF on your desktop, then run the result through whichever pdfcraft tool you need.