While PDF-XChange has a paid "Pro" version, the is remarkably generous. It allows you to edit text, add images, and annotate without a watermark (except for "Save" vs. "Save As" limitations).
No free portable PDF editor lets you You’ll often need to delete old text and add new text in a matching font. For complex layouts, you’re better off editing the original document (Word, InDesign) and re-exporting to PDF. pdf editor portable free
For simple text changes, this beats paid tools. Just re-export as PDF when done. While PDF-XChange has a paid "Pro" version, the