Add a PAID stamp to a PDF
A rubber stamp on a PDF is a bordered, colored mark — PAID, APPROVED, RECEIVED, VOID and similar — placed at a fixed spot on the page, the digital equivalent of an office ink stamp. This tool draws preset or custom bordered stamps in four colors onto the pages you choose, with an optional date line, corner positions or a diagonal center variant. The stamp becomes permanent page content, and everything runs locally in your browser.
How it works
Each stamp is built from three drawing operations written directly into the page's content stream: a rounded rectangular border stroked at a fixed line weight, the stamp word set in a bold uppercase face sized to fit the border, and — if enabled — a smaller date line beneath it. Because the operations are appended to the page content rather than attached as an annotation, the result behaves like ink on paper: every viewer shows it, every printer prints it, and it cannot be clicked away or deleted from a comments panel.
Placement works in page coordinates. For the four corner positions the tool measures the page's crop box, computes the stamp's bounding box from the text length, and offsets it a fixed margin in from the chosen corner — so the stamp lands sensibly whether the page is A4, Letter or an odd scan size. The diagonal variant instead translates the coordinate system to the page center and rotates it before drawing, producing the classic slanted DRAFT-across-the-middle look without touching the underlying artwork.
The presets — PAID, APPROVED, RECEIVED, VOID, DRAFT, CONFIDENTIAL, COPY, or your own custom text — differ only in the word drawn; the border geometry and the four color choices (red, blue, green, gray) are shared. A page range field such as 1 or 2-4,7 limits stamping to specific pages, which matters for multi-page invoices where only the summary page should carry the mark. One caveat worth knowing: the stamp is visually permanent but not cryptographically protected — someone with a PDF editor could reconstruct the page. For tamper evidence, pair it with a hash-based approach.
Illustrative example: marking a 3-page invoice as paid
Illustrative scenario, not a recorded benchmark. File sizes, timings and results depend on the input and device. Try the reproducible samples.
A 3-page invoice PDF (412 KB) needs a PAID mark on page 1 only. Settings: preset PAID, color green, position top right, date enabled, page range 1. The tool draws a green bordered stamp roughly 42 mm wide in the top-right corner of page 1, with "PAID" at about 22 pt and "2026-08-13" beneath it at about 9 pt; pages 2 and 3 are untouched. The output file is 414 KB — the stamp adds only a few hundred bytes of drawing commands plus one embedded font subset. Printed or viewed anywhere, page 1 now carries the same mark an ink stamp would leave, minus the smudging.
Frequently asked questions
How do I add a PAID stamp with today's date to an invoice PDF?
Load the invoice, pick the PAID preset, tick the date option and choose a position such as top right, then download. The stamp is drawn as page content with the date line under the word PAID, so it prints and displays in every PDF viewer.
Can the stamp be removed later by whoever receives the file?
Not casually. The stamp is written into the page's content stream rather than added as an annotation, so ordinary viewers cannot select or delete it. It offers no cryptographic protection, though — a determined user with editing software could still rework the page.
Can I stamp only the first page instead of the whole document?
Yes. The page range field accepts entries like 1 or 1-3 or 2,5,7, and only those pages receive the stamp. Leaving the range empty stamps every page.
What stamp presets and colors are available?
Presets are PAID, APPROVED, RECEIVED, VOID, DRAFT, CONFIDENTIAL and COPY, plus a custom text field for anything else. Each can be drawn in red, blue, green or gray, in a corner or rotated diagonally across the page center.
What is the difference between a stamp and a watermark?
A stamp is a small, opaque, bordered mark placed at a specific spot, like an office rubber stamp; a watermark is large, faint text repeated behind or across the whole page. For faint diagonal text on every page, a watermark tool is the better fit.
Is my invoice uploaded anywhere when I stamp it?
No. The PDF is opened, stamped and saved by JavaScript running in your browser, and the file never leaves your device.