Merge PDFs safely in the browser
Decide before you drop the files
A safe merge is a boring merge. You already know which file is the report and which file is the appendix, the pages are finished, and the only question is order. If you are still rewriting a paragraph, stop and go back to the program that created the PDF. The merge tool copies pages. It does not edit sentences. Mixing a draft with a final and hoping you will spot the old sentence later is how the wrong page gets emailed. Name the files so the thumbnails are not all called scan.pdf. Put the report first in your own folder, the appendix second, and only then open the tool.
Unlock passwords before you add a file. A PDF the browser cannot open cannot be placed in order. Work on a copy if the only original is a mail attachment you cannot download again. NexTool does not keep the files, which is the privacy property and also the reason there is no “restore my merge” button. The sample on the tool page is a two-page report and a one-page appendix. Practice on those until the export is three pages with the appendix last. That rehearsal is the safest way to learn the preview.
Check the story, not just the page count
Three pages can still be the wrong three pages. Open the export and read the first line of the report, the last line of the appendix, and one sentence in the middle of each source. Look for a sideways scan you meant to rotate. Look for a blank page the scanner added. Merging does not recompress images, so the file may be larger than either source. That growth is not a failure. If you need it smaller afterward, compress as a separate decision, because compress redraws pages and can soften text that the merge had kept sharp. Do not compress first and merge second if you still need sharp text. The redraw would already have happened.
Send the file only after that reading. The privacy gain of a local tool is wasted if you then upload the merged PDF to a random inbox checker “just to see the size.” The size is a property you can see on your own computer. Local versus upload explains the rest of that habit. Keep the sources until the recipient confirms the packet. NexTool will not have a copy if the download was the wrong export.
After the download
Open the merged PDF and count the pages before you attach it to mail. The sample is a two-page report plus a one-page appendix, so three pages in that order is the check. Your file has its own count. A thumbnail that looks right and a page count that is short means a file was left out of the list, not that the browser summarized it. Rotate or reorder in the same local session if a scan came in sideways, then export once more from the originals. Do not merge a merged file with a late page if you can still rebuild the list. NexTool does not keep the result. The copy in your downloads folder is the one you will send, and the originals stay where you put them.