How to use this tool:

1. Select one or multiple PDF files using the button above or by dragging and dropping
2. Select files you want to add page numbers to using checkboxes
3. Customize page number settings: format, position, font, color, etc.
4. Use "Update Preview" to see how page numbers will look
5. Click "Add Page Numbers" for selected files or "Add to All Files" for all
6. After processing, click "Download PDF with Numbers" to save your file