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ApowerPDF for Windows is a professional PDF program for PDF editing and conversion. You can use it to modify your PDF content, add watermarks, signature, annotations, page numbers, and hyperlinks, reduce file size, crop PDF, protect and unlock PDF, etc. with it.
ApowerPDF for WindowsOne-stop Solution for PDF Files
Apowersoft PDF Converter is a professional tool for PDF conversion. It can convert different formats to PDF and vice versa. It also supports merging PDFs. You can convert your files with a few steps.
Apowersoft PDF ConverterEasily Convert PDF to Word, Excel, PPT, etc. and Vice Versa
Mr.Avineleft a comment
It has many tools we can use, such as converting files, adding signature, adding watermarks, lock and unlock the PDF,etc. But I use conversion most. And it works good. Pros: It is free and has no limitations. It has no ads. Cons: Cannot upload multiple files one time.
LightPDFA free, simple PDF toolkit for Windows, Mac, Android and iOS