we need JavaScript libraries:
pdf.js: “https://cdnjs.cloudflare.com/ajax/libs/pdf.js/2.12.313/pdf.min.js”
pdf-lib: “https://unpkg.com/pdf-lib@1.3.0” //This library helps to delete pages.
downloadjs: “https://unpkg.com/downloadjs@1.4.7” //use for download attachment
Make a index.html file
save and run to the browser
After selecting pdf file it shows pages number, then select pages which you want to delete
