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Re:Free PDF merge / split tool online – PDFWrench.com by radiationfrog on Wednesday October 07, 2020 @10:33PM (#24715049)
PDFWrench.com Free PDF tool to merge / split / reorder pages of multiple documents that works without any file upload required.

Everything happens locally in your browser to ensure privacy and security.

It accomplishes this using javascript's latest technology : WebWorkers and offscreencanvas