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A practical guide to crossing out text in a PDF, whether you draw a strike line over existing words or retype text with a struck-through style.

A plain-English guide to storing PDFs in Dropbox and editing them properly: download, edit in a real PDF editor, then save the finished file back cleanly.

A practical guide to splitting one PDF page into two separate pages, whether you are cropping a 2-up scan in half or dividing a wide page down the middle.

A step-by-step guide to sending a PDF on WhatsApp, compressing large files to upload faster, and fixing the most common send errors.

A step-by-step guide to resizing PDF pages, including how to switch between A4 and Letter cleanly without cutting off margins or distorting the layout.

A practical guide to resizing and moving an image in a PDF, selecting the picture, scaling it from a corner to keep proportions, repositioning it cleanly, and saving without blur.

A step-by-step guide to replacing one page in a PDF — delete the old page, drop the corrected one into the exact same position, and download a clean file.

A step-by-step guide to numbering a PDF from a chosen page, so the cover and front matter stay clean while the numbers start exactly where you want.

A clear guide to mirroring or flipping a PDF page horizontally or vertically, creating a true mirror image that saves permanently instead of just rotating the view.