My Tool Studio
PDF

Add Watermark to PDF

Legal drafts circulate, and sooner or later somebody quotes version two as if it were final. Stamping DRAFT across every page prevents that, and this tool does it in your browser: add watermark to pdf files by typing the text, then tune opacity, rotation, and font size with sliders while every page thumbnail previews the result live. The stamp defaults to CONFIDENTIAL at 30 percent opacity, rotated 30 degrees counterclockwise, the classic diagonal you've seen on a thousand documents. Click Apply and the text is drawn onto every page in bold grey Helvetica. As a pdf watermark online option it's text-only by design, built for documents rather than photos, and the file never leaves your machine.

Always freeNo sign upRuns in your browser

How to use

01

Upload the document

Drop a PDF up to 100 MB into the upload zone. Controls appear on the left, and a thumbnail grid of every page renders on the right, since the stamp applies to all pages.

02

Set text, opacity, rotation, size

Type your watermark text, DRAFT, CONFIDENTIAL, or anything else, then drag the three sliders: opacity from 5 to 100 percent, rotation from -90 to 90 degrees, font size from 20 to 120 points.

03

Apply & download

Watch the thumbnails update as you drag, there's no render wait. When the balance looks right, press Apply & download and the text is baked into each page, saved with a -watermarked suffix.

Why Add Watermark to PDF

Common questions

Can this watermark tool stamp pdf with logo images?
No, the watermark here is text drawn in bold Helvetica, and there's no image upload. For placing a logo on photos, the Image Watermark tool handles pictures with its own position and opacity controls. On contracts and reports, a text stamp usually reads more clearly anyway.
What opacity keeps a watermark readable without burying the text underneath?
Stay between 15 and 40 percent for documents people still need to read. The 30 percent default is a sensible anchor. Push toward 100 only for void stamps where obscuring the content is the point.
Does the watermark go on every page or just the first?
Every page, centered, at the same angle and size throughout. The note under the filename says so up front. If only certain pages need marking, split those out first, stamp them, and merge the file back together.
Why is a diagonal angle the default for the watermark?
The 30 degree counterclockwise tilt crosses both text columns and white space, so the stamp stays visible regardless of layout, while a horizontal mark can vanish into a line of body text. You can drag rotation anywhere from -90 to 90 degrees.
Is a CONFIDENTIAL watermark actual security?
No, it's communication. The text becomes part of the page content, but a determined person with an editor can strip it, and it doesn't encrypt anything. Treat it as a strong label, and reach for password protection when access control is the real goal.
Can I watermark pdf free with no account or added branding?
Yes: no signup, no branding of ours on the output, no page limit inside the 100 MB cap. The only marks on the download are the ones you typed.
How private is the watermarking process?
Fully client-side. The document loads into your browser's memory, pdf-lib draws the text, and the download is generated locally. Draft settlements and unfiled patents never touch a server.
What font size suits a one-word watermark like DRAFT?
Between 60 and 90 points works well on A4 and letter pages, large enough to register at a glance. Above 100 points a long word may run past the edges on portrait layouts, and the live preview will show that overflow before you commit.
Is this a dedicated pdf watermark tool, or a general PDF app?
It's a dedicated pdf watermark tool, nothing else competes for the screen. As a pdf watermark adder it does one job: type text, set opacity, rotation, and size, then stamp every page. Merging, page numbers, and the rest live on their own tools here.
Where is the option hidden in a pdf editor watermark menu?
There's no menu to dig through. Unlike a pdf editor watermark feature buried inside a toolbar, this page is the feature, so the text field and the three sliders are the first thing you see after you drop a file in.
How fast is it to watermark pdf online with the live preview?
Quick. When you watermark pdf online here, the text redraws on every page thumbnail the instant you type or drag a slider, so there's no render wait. The only processing moment is the click that bakes it in, which is why you can watermark pdf and download in seconds.
What file do I get after the pdf watermark add online finishes?
A copy of your document with the text drawn into every page, saved with a -watermarked suffix. The pdf watermark add online run leaves the original file on your disk untouched, so you always end up with two files: your clean source and the stamped version.
Is it free to add watermark to pdf online free for a whole batch?
Yes, one file after another. You add watermark to pdf free for as many documents as you like, since there's no per-file charge and no quota. Each file runs in its own pass, so add watermark to pdf online free scales to a folder of contracts without a paywall.
Does the add watermark in pdf online step accept any text I type?
Any text at all. The field starts on CONFIDENTIAL, but the add watermark in pdf online step takes DRAFT, a case number, a client name, or a short phrase. Keep one-word marks large and multi-word marks smaller so they don't run past the page edges.
How do I insert watermark in pdf files that are already filled in?
The stamp is a new layer drawn over whatever's there, so you can insert watermark in pdf forms, signed pages, or finished reports without disturbing the content beneath. The watermark in pdf file sits on top at the opacity you choose, so the text underneath stays readable.
Where does the tool put watermark on pdf pages by default?
Dead center of every page. When you put watermark on pdf here, the text is centered horizontally and vertically rather than pinned to a corner, so a long word still fits and a short one stays balanced. There's no corner placement, so watermark add in pdf always means a centered mark.
Does any pdf to watermark work, including scanned documents?
Any PDF up to 100 MB, scanned or born-digital. Pick a pdf to watermark and the text draws as a fresh layer on top of each page, so it shows on a photographed page just as clearly as on a text one. The mark sits over the image, not woven into it.
Does this pdf watermark creator also add image watermark to pdf logos?
No. This pdf watermark creator draws text only, so you can't add image watermark to pdf here. Text stays crisp at any size and can't be lifted out as easily as a pasted picture. For a logo, run the pages through the Image Watermark tool instead, then come back if you also want a text mark.
Can this page remove watermark from pdf online, or only add one?
It only adds them. Once text is part of a page's content there's no dependable, automatic pdf watermark remove, so we don't offer remove watermark from pdf online here. Tools that promise a free remove watermark from pdf online free result usually just cover the mark with a white box, which peels back under inspection. Keep an unstamped master copy instead.

More PDF tools

View all