Watermark PDF

Add text watermark to every page of your PDF. Choose font, size, position and opacity.

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or drop the file here

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Tip: you can also paste with Ctrl V

Text in any languageCONFIDENTIAL, DRAFT, your name — English, हिन्दी or any script.

Logo watermarksStamp a PNG or JPG logo with adjustable size and transparency.

Tiled or placedOne stamp in any of 9 positions, or repeated across the page.

How to add a watermark to a PDF

1
Open your PDF
Drop the PDF you want to stamp onto the page. It opens right here on the page; the file itself never leaves your device.
2
Type text or pick an image
Enter your watermark words, such as CONFIDENTIAL, DRAFT or a company name, or upload a logo/PNG to use an image stamp instead.
3
Set angle, opacity and colour
Choose a diagonal 45-degree tilt or horizontal placement, drag opacity so the mark shows without hiding the text, and pick a colour like light grey or red.
4
Choose which pages get stamped
Apply the watermark to all pages or restrict it to a range, for example only the annexures of a tender document.
5
Apply and download
pdf-lib writes the overlay onto each chosen page and hands you the stamped PDF to save instantly.

Watermark PDF in detail

Watermark PDF uses pdf-lib inside your browser to draw an overlay onto each page's existing content stream, so your original text and images stay intact underneath. For a text watermark it embeds a standard font, measures your string, then draws it with the rotation angle (a diagonal 45-degree CONFIDENTIAL is the usual ask) and an opacity value below 1 so the page beneath stays readable. An image watermark, such as a company logo or a "DRAFT" PNG, is embedded once and painted onto every selected page at the scale and transparency you pick. Because the stamp is written into the page description rather than flattened over a rasterised image, the PDF stays sharp and text stays selectable. A common India use: a CA, freelancer or startup marking an invoice, quotation or agreement CONFIDENTIAL before emailing it, or an MSME dropping its brand stamp on a rate card so a forwarded copy still shows who made it. You choose all pages or a range, so a cover letter can stay clean while annexures get stamped.

After stamping a document CONFIDENTIAL you may also want to protect the PDF with a password so only the intended recipient can open it. For a multi-page contract, add page numbers alongside your watermark so annexures are easy to reference. Once a DRAFT is approved, remove the draft stamp and sign the PDF to finalise the agreement. If a shared copy contains private figures, redact the sensitive parts before you stamp and send it.

When people use it

Mark invoices CONFIDENTIAL

CAs and freelancers in India stamp GST invoices or quotations CONFIDENTIAL before emailing a client, so a forwarded copy is clearly marked.

Brand a shared rate card

An MSME or startup adds its logo as an image watermark across a price list so whoever it reaches still sees who issued it.

Flag a DRAFT agreement

Legal and HR teams tilt a light DRAFT across a contract or offer letter so an unsigned version is never mistaken for final.

Protect a portfolio or design

Photographers and designers stamp their name diagonally over a PDF portfolio before sharing on WhatsApp or email.

Step-by-step guides

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How to Add Page Numbers to a Project Report or Thesis PDFNumber your project report or thesis the way colleges expect: skip the cover and certificate pages, start at 1, choose “Page 1 of N” and pos…
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About Watermark PDF

Watermarks tell readers what they're looking at. A draft copy is marked DRAFT so nobody acts on it as if it's final. A confidential document is marked CONFIDENTIAL so the recipient thinks twice about forwarding it. A photo proof is marked with the photographer's logo so a sample doesn't end up online as a full image.

Watermark PDF stamps text or an image across every page, or across a specific range of pages, with control over placement, opacity, rotation, and size. The output PDF carries the watermark baked into the page contents, which means it shows up in any reader and in print.

Text or image

Text watermarks are the quick choice. Type the word, pick a font, set a colour, choose how transparent you want it. Diagonal across the page at 30 percent opacity is the classic look for DRAFT or CONFIDENTIAL stamps. Horizontal at the top or bottom is better for short labels like the document version.

Image watermarks let you stamp a logo. PNG with transparency works best because the logo blends into the page without a white box around it. JPG works too if you have a logo on a transparent background already saved as PNG, otherwise the JPG will paint a rectangle behind the watermark.

Placement options

Position picker has the nine standard spots: top left, top centre, top right, middle left, centre, middle right, and the same row across the bottom. Centre with a 45-degree rotation is the standard for full-page CONFIDENTIAL stamps.

You can also enter custom coordinates if you want the watermark in a specific spot, like the upper-right corner with a 10mm margin.

Opacity controls how much of the page underneath shows through. Twenty to forty percent is the sweet spot for full-page diagonal stamps; readers can still read the document but the stamp is clearly there.

Apply to all pages, odd pages, even pages, or a specific range. Useful when only the cover should be branded but the rest of the pages need to stay clean.

When you'd watermark

Sending drafts to reviewers. Marking DRAFT prevents the version from being passed around as if it were final.

Sharing internal documents that shouldn't leave the company. CONFIDENTIAL or INTERNAL ONLY at 30 percent opacity is the standard.

Branding a deliverable. A consultant's logo in the corner of every page so the document keeps the firm's brand even after it lands in a client's filing system.

Watermarking sample work for portfolios or proofs. A photographer or designer can share examples online without worrying about full-resolution copies escaping.

Things worth knowing

Watermarks are baked into the page content; they aren't an annotation layer on top. So a recipient can't simply uncheck a layer in their reader to remove them. They'd have to use a PDF editor to redact, which is a separate, deliberate step.

Determined users can still remove watermarks with the right tools. If the document is truly sensitive, encrypt it with the Protect PDF tool in addition to watermarking. The combination is much harder to undo than either alone.

The watermark increases file size by a small amount, especially with image watermarks. A logo at the corner of every page in a 100-page document adds roughly the size of the logo PNG times 100, sometimes more if the logo is large.

Watermarks that actually work as warnings

Words matter. "DRAFT" in big diagonal text catches the eye faster than "Confidential - Internal Use Only" in small horizontal text, because most readers process bold large text faster than they read fine print. Save the long phrases for the document header or footer; save the centre of the page for one strong word.

Colour choice is the second lever. Black at low opacity reads as a quiet "please notice this" stamp. Red at higher opacity reads as "stop and read me". Grey gets ignored. Pick the colour that matches how seriously you want the warning to land.

Frequently Asked Questions

Can I add an image as a watermark, like a company logo?

Yes. Upload a PNG (transparent backgrounds work best) or a JPG, position it on the page, set the opacity and rotation. Logo watermarks usually look cleanest in a corner at around 60 to 80 percent opacity. For a full-page stamp like CONFIDENTIAL, a diagonal text watermark at 30 percent opacity is the more typical choice.

Will the watermark show up when the PDF is printed?

Yes. The watermark is baked into the page contents, not just shown by the viewer. Printers, exports, screenshots, all of them include the watermark because it's part of the actual page.

Can I watermark only certain pages?

Yes. The apply scope option lets you pick all pages, current page only, odd, even, or a specific range. Useful when the cover page is fine but the body pages need a DRAFT stamp.

Can someone remove the watermark from the PDF I send?

A determined person with a PDF editor can remove most watermarks. If the document is genuinely sensitive, combine watermarking with the Protect PDF tool to add a password. The combination is much harder to undo than either alone, because the editor first needs to crack the password before it can even open the file to strip the watermark.

Why does my watermark look pixelated?

If you uploaded a small image as the watermark and stretched it across the page, the renderer has to enlarge it, and that's where pixelation comes from. Use a high-resolution source image, at least twice the size you intend to display, and the watermark will stay crisp.

How do I add a diagonal CONFIDENTIAL watermark across every page?

Type CONFIDENTIAL in the text field, set the rotation to 45 degrees and keep opacity low, around 0.2 to 0.3, so the underlying text stays readable. Choose "all pages" and apply; pdf-lib draws the same tilted stamp on each page in one pass.

Can I use my company logo as the watermark instead of text?

Yes. Upload a PNG or JPG logo and switch to image mode. The image is embedded once and painted onto every selected page at the scale and transparency you set, which is ideal for putting a brand stamp on a rate card or brochure before sharing.

Will the watermark cover or blur the text underneath?

No. The stamp is drawn as a semi-transparent overlay on top of the existing content, and the text beneath stays selectable and searchable. Lower the opacity if the mark feels too heavy over dense pages.

Can I watermark only some pages, like just the annexures?

Yes. Instead of "all pages" you can give a page range, so a tender cover letter stays clean while only the annexures or supporting documents carry the CONFIDENTIAL or brand stamp.

Is my document uploaded to a server when I add a watermark?

No. The stamping runs in your browser with pdf-lib, so a confidential invoice, agreement or salary slip is never sent to any server. This matters when the whole point is keeping a sensitive document private.

Can I add a watermark to a PDF on my phone?

Yes. It works in a mobile browser, so you can stamp DRAFT or your name on a PDF from an Android or iPhone before sharing it on WhatsApp, without installing any app.