Last updated: October 6, 2026

Add Watermark to PDF Free – Stamp in 30 Seconds

CONFIDENTIAL, DRAFT, or your brand — diagonal, tiled, or footer. Free in-browser tool, no signup, no watermark added by us.

Drop your PDF here to watermark it

DRAFT, CONFIDENTIAL, your brand — up to 100MB, stamped 100% in your browser

Watermark a PDF Online in 30 Seconds

To watermark a PDF free: upload the file above, type your stamp text, choose diagonal, tiled, or footer placement, tune transparency with the live preview, and download. About 30 seconds, works on phones, costs nothing.

Watermarking a PDF means printing semi-transparent text across its pages to mark status (DRAFT), sensitivity (CONFIDENTIAL), or ownership (your brand). Our tool does this entirely in your browser: no account, no upload, and the stamp is flattened into the file so it cannot be clicked off.

How to Watermark PDF Pages in 3 Steps

Upload PDF

Drag & drop your file or click to browse — up to 100MB, never leaves your device.

Design the Stamp

Type text, pick placement and color, and dial transparency with live preview.

Download

Click Watermark & Download for a flattened PDF stamped on every page.

Why Stamp PDFs Here?

Three Placements

Diagonal, tiled, or footer — one tool covers every convention.

Live Preview

See the exact stamp on page one before downloading.

100% Private

Local processing — contracts never leave your device.

Flattened Output

Stamps baked in — not removable with one click.

Works on Mobile

Stamp files on iPhone, iPad, and Android.

Unlimited & Free

No signup, no watermarks added by us.

The Complete Guide to PDF Watermarks

A watermark is metadata made visible: it tells every reader, at a glance, how to treat the document. DRAFT says expect changes; CONFIDENTIAL says limit circulation; a brand mark says this is ours. The best stamps are boring — short text, consistent placement, transparency that whispers instead of shouts.

Choosing placement and strength

Diagonal suits status words that must be unmissable on every page. Tiled suits proofs, samples, and portfolios where any cropped screenshot should still carry the mark. Footers suit finished documents where branding matters but content is king. Start at 25% opacity and move only if the preview demands it — most first attempts are too bold.

Common scenarios

Consultants stamp DRAFT on proposals in review; finance teams stamp CONFIDENTIAL on board packs; photographers stamp proofs before payment. After stamping, sensitive files often need password protection too — a stamp declares sensitivity, a password enforces it. Oversized stamped files going to email can follow up with Compress PDF, since stamping barely changes file size.

Privacy and quality notes

Because stamping runs locally via the pdf-lib engine, your documents never leave your device. Text watermarks add kilobytes, never recompress your pages, and print as cleanly as they display. Keep the original unstamped file — removing a flattened stamp later is intentionally hard.

Frequently Asked Questions

Everything about watermarking PDFs, answered

How do I add a watermark to a PDF for free?

Upload your PDF above, type the watermark text (CONFIDENTIAL, DRAFT, your company name), pick diagonal, tiled, or footer placement, adjust transparency and color with the live preview, then click Watermark & Download. Stamped on every page in about 30 seconds — free with no signup.

Is this watermark PDF tool free?

Yes, 100% free with no page limits up to 100MB per file, no watermarks added by us, and no signup. It is supported by clearly labeled display ads.

Is it safe to watermark contracts here?

Yes — safer than upload-based tools. Everything runs locally in your browser with the pdf-lib engine, so contracts, invoices, and portfolios never leave your device. Nothing is uploaded or stored.

Can the recipient remove my watermark?

Not with one click. The watermark is flattened into page content rather than left as a movable annotation. Like any PDF, the file itself can still be edited with PDF software — for sensitive documents, password-protect afterwards with our Lock PDF tool.

What is the difference between diagonal, tiled, and footer watermarks?

Diagonal places one large rotated mark across each page — best for DRAFT and CONFIDENTIAL. Tiled repeats a smaller pattern over the whole page — best for proofs and samples you want protected everywhere. Footer adds a small line at the bottom — best for branding and page ownership without covering content.

What watermark text should I use?

Match the purpose: CONFIDENTIAL for sensitive internal files, DRAFT for work in progress, DO NOT COPY or SAMPLE for shared proofs, and your company name or domain for branded documents. Keep it short — one or two words read best at an angle.

How transparent should a watermark be?

Start around 25%: readable at a glance but never blocking the content underneath. Proofs and samples can go bolder (40–60%); branded footers can go lighter (10–15%). The live preview shows the exact balance before you download.

Can I watermark only some pages?

This tool stamps every page for consistency — the standard expectation for DRAFT and CONFIDENTIAL markings. For mixed documents, split the file with our Split PDF tool, watermark the section you need, then rejoin with Merge PDF.

Can I add a logo image as a watermark?

This tool stamps text watermarks, which stay crisp at any size and keep files small. For logo overlays, add the logo with our Edit PDF image tool first, then stamp text here if needed.

Will watermarking change my file size or quality?

Barely. Text watermarks add only a few kilobytes — the original pages are untouched, not recompressed. File size stays virtually identical.

Can I watermark a password-protected PDF?

Unlock it first with its password using our Unlock PDF tool — the stamper cannot bypass encryption. Re-apply protection after watermarking if the document must stay protected.