You can add many more PDFs that you wish to resize. Supported types: PDF, DOC, DOCX, ODT, PPT, PPTX. NoteEnter Required PDF Size In KB. Increase PDF file size to any specified level. (other files will be Click on Start. How to Resize your PDF. First: Upload your file from your computer or a cloud or drag and drop it into To resize PDF online for free follow the following steps: Click on the Choose File button on our PDF resizer. Select the PDF whose size you want to resize. Online PDF resizer