How to prepare a confidential PDF before sharing it

Inspect what the file reveals

A PDF can say more than its pages show. Open PDF properties and metadata with your file and read the page count, the title, the author, the subject, the keywords and the dimensions of the first pages. Titles and authors often reveal a person’s name, a project, a previous client or a draft number that you did not intend to share. Copy the summary and keep it as a record of what was in the original. This step only reads information; nothing is changed or sent. Do it on a copy if the document is delicate, so the original stays exactly as it was.

Edit the properties that you can control

Edit PDF metadata lets you review and change the title, author, subject and keywords, and save a copy. Replace a revealing title with a neutral one and clear the author when it is not needed. Be aware of the limits: other embedded data, such as XMP metadata, is not modified by this tool, and editing a PDF invalidates existing digital signatures. That means this step reduces what is visible in the standard properties, but it is not a complete sanitization. Reopen the copy in PDF properties and metadata to confirm that the fields changed as you expected.

Delete the pages that must not leave

Delete PDF pages creates a new file without the pages you list, for example 2 or 2-3, and keeps the rest in order. Use it for an annex, a page with prices or any page that is not meant for the recipient. Deleting a page removes it from the copy; it does not remove text from the pages that remain. If a remaining page contains something sensitive, that needs real redaction in a tool designed for it, and drawing a black rectangle over text is not enough because the text underneath can still be selected. Count the pages of the result.

3 → 2
Snipshed sample → Confidential copy

Mark the copy with a watermark

Watermark PDF adds visible text, for example DRAFT or the recipient’s name, with a position, rotation, size and opacity you choose. A watermark does not prevent copying, but it makes a leak traceable and signals that the document is not final. Keep the text readable without covering the content: a lower opacity and a diagonal position usually work well. Apply it after deleting pages, so that it appears only on pages that remain, and check it on the first, middle and last pages of the result.

Reduce the size and test the final file

If the file is too heavy for email, Compress PDF recompresses embedded JPG photos and downscales those with excessive resolution, while text and graphics do not change; if the file is already optimized, you are told and nothing is created. Then test the final copy as the recipient would: open it in another viewer, check the page count, the properties, the watermark and that the deleted pages are gone. Name the file for the recipient, keep the original somewhere private and remember that sending the PDF shares it with the service you use to send it.