Marking PDFs with an expiry date prevents outdated versions from being used after they are superseded. Here is how to stamp one on your document.
Go to pdfeditor.onl/header-footer. Enter expiry text in the footer: "Valid Until: December 31, 2026" or "Version 2.1 — Expires 2026-12-31". Apply to all pages.
Go to pdfeditor.onl/watermark-pdf. Enter the expiry date as watermark text. Set opacity to 20–30% for a background mark.
Tip: For contracts and proposals, the footer method is more professional — the expiry date appears in a small, consistent location on every page without obscuring content.
No — PDF expiry locking requires Adobe Acrobat Pro's Rights Management or DRM solutions. The stamping method visually marks the date but does not technically lock the file.
Yes — completely free at pdfeditor.onl.