Add Watermark

Both. Type the text and pick a font, colour, size, angle and opacity, or upload a PNG or JPG logo. Place a single copy at one of nine positions or repeat it across the page.

With "blend into the page" on, dark text shows through the watermark; otherwise it is stamped on top. The preview on every thumbnail shows exactly what you will get.

Nothing is uploaded: the file is opened and processed inside your browser and never leaves your device. Close the tab and it is gone.

Yes. The look you set belongs to the file you are looking at, so one document can carry "Draft" and the next a client's name. Switch the scope to all files and the same watermark is stamped on every one of them instead - the per-file settings are kept aside, not lost.

It becomes part of the page content, not a layer a reader can switch off, so it survives printing, copying and conversion. It is still a mark of ownership rather than a lock: someone with the right tools can work around it. If the file itself must be protected, use Protect.

Yes. Drop in a .docx, .xlsx or .pptx file or an image (JPG, PNG, WebP...) and it is turned into a PDF in your browser as it arrives - an image onto an A4 page - then handled like any other PDF; nothing is uploaded. The conversion is our own, so the result can differ slightly from Office's own PDF export: a font may be substituted and charts are left out. The file list shows a warning when something couldn't be carried over.