Add watermark to PDF

A watermark is useful when a PDF needs a visible status or ownership signal. Canadian teams often use it on draft agreements, proposal PDFs, client-facing reports, confidential board documents, school handouts, construction drawings, catalogues, invoice copies, and sample documents. The watermark should help the recipient understand how to treat the file without making the file hard to read.

For general review files, centre placement with a diagonal rotation is clear. For invoices or reports, a corner mark can be more professional. For confidential packs, a repeated watermark makes the status harder to miss on cropped or printed pages.

Short text is easiest to read. Use “DRAFT”, “CONFIDENTIAL”, “SAMPLE”, “PAID”, “INTERNAL”, a client name, a project code, or a distribution note. Start with opacity around 20% to 30%, then adjust based on the PDF background. On a dense contract, a lighter grey watermark is often enough. On a scanned form, a slightly stronger mark may be needed.

If the PDF contains both portrait and landscape pages, use preview navigation before exporting. A centred mark may look perfect on the first page and too close to an edge on a rotated page unless you adjust placement or scale.

Image mode supports PNG and JPEG. For logos, a transparent PNG is usually best because it preserves the logo shape without a white rectangle. Use JPEG for rectangular brand marks or photographic images. Keep image opacity lower than you would for normal branding, especially if the PDF has text underneath.

A logo watermark can be applied once in a corner or repeated across pages. Repeating a logo is stronger but can feel busy, so increase tile spacing for reports, contracts, and client deliverables.

Page selection is helpful for mixed-purpose PDFs. Mark only the cover page of a proposal, only attachment pages in a contract pack, only odd pages of a booklet layout, or everything after page 10 with a custom expression. The custom format supports examples like 1-3, 7, 10-.

Batch processing applies one watermark profile to every selected PDF. That is useful when preparing monthly invoice copies, a set of draft policies, course handouts, or a folder of client review documents. Review the output before sending, because one profile may land differently across documents with unusual page sizes.

The watermarking workflow is local to your browser. That helps when the file contains client names, employee information, supplier terms, commercial pricing, or other material that does not need to be uploaded for a simple watermark. The original PDFs remain unchanged and the tool creates new downloadable files.

Browser memory is the practical limit. Very large scans and large batches may be slower than ordinary digital PDFs. Split the work into smaller batches if the browser struggles.

A watermark does not remove information and does not prevent a determined person from editing a PDF. Use redaction when information must be permanently hidden. Use password protection when the file needs opening or editing restrictions. Use a digital-signature workflow when integrity and signer identity matter. Adding a watermark to a signed PDF normally invalidates the existing signature because the file has changed.