Unify PDF page sizes

Because each page came from somewhere else: a scanner writes A4, a phone photo becomes a page shaped like the camera lens, and a table exported from accounting software comes out landscape. Merging puts all three in one file without reconciling them, and the problem shows up at the printer, or at a portal that insists on A4.

No. Nothing is turned into an image at any point: text stays selectable and searchable, vector drawings stay vector, and all that happens is that the whole page is scaled up or down inside its new sheet. The file stays sharp however far you zoom in.

Fit the whole page shrinks each page until all of it is inside the sheet, which can leave a white band on two sides and cuts nothing off. Fill the sheet enlarges the page until it covers the paper, so no white is left, but whatever passes the edge stops being visible. Start with the first one: it is the safe choice for official documents.

On Match the page, which is the default, every page keeps the orientation it already had: a landscape page comes out on a landscape sheet of the same size, so a wide table is not shrunk to a quarter of its size to fit a portrait sheet. Choose Portrait if you want every page upright.

No. The result is new pages carrying the content of the old ones, and links, form fields and comments are attached to the page object rather than to its content, so they do not travel. If you have a filled form, run it through the flatten tool first: the answers become permanent page content and then nothing is lost.

No. All of the processing happens inside your browser on your own device, and the file never leaves it. You can disconnect from the internet after the page loads and the tool still works.