Add Watermark to PDF

What a watermark is for

A watermark is text laid over every page to say something about the document as a whole: DRAFT, CONFIDENTIAL, SAMPLE, COPY, NOT FOR DISTRIBUTION or the name of the person it was prepared for. Businesses use them to label unfinished contracts, teachers to mark sample answers, and freelancers to stop proofs being used before payment.

A visible watermark discourages misuse and shows where a document came from. It does not stop a determined person from removing it, so it is a label rather than a lock; for real protection combine it with a password using PDF Password Protector.

The settings, explained

Every control changes something you can see straight away in the finished file.

• Text is the wording. Keep it short: one to three words read best, and the text is limited to 60 characters.
• Layout places one watermark in the centre, or repeats it across the page in a staggered pattern, which is harder to crop out.
• Size sets the type size in points. Big text reads as a stamp; smaller text works for repeated patterns.
• Opacity controls transparency. Around 20 to 30 percent keeps the page readable underneath; 50 percent and above starts to compete with the text.
• Angle turns the text from 0 to 90 degrees. Forty-five degrees is the classic diagonal stamp.
• Colour and bold let you match a brand or make the text stand out. Grey and light red are the most common choices.
• Pages limits the watermark to a range such as 1-3, 5; leave it blank to mark every page.

Design tips that make it work

A watermark should be noticed without ruining the page. Place a single, large diagonal word for something like DRAFT, where visibility matters most. Use the repeated layout with a smaller size and lower opacity for a subtle "Prepared for Jane Smith" pattern that is hard to remove without leaving traces. Choose a colour that contrasts with your text colour: a pale red or grey over black text keeps both legible.

Check the preview by opening the finished file and zooming in on a page with dense text and a page with a photo. If reading becomes tiring, lower the opacity or reduce the size and save again. Because the process is instant, small iterations are easy.

Characters and fonts

The watermark is drawn with a standard PDF font (Helvetica), which covers English and most Western European letters, numbers and common punctuation. Characters outside that set, such as Chinese, Arabic or emoji, cannot be drawn by the standard font, so the tool tells you instead of producing a broken file. If you need such text, add it as an image: create it in an image editor, convert it with JPG to PDF, and overlay it in a PDF editor.

Pages that were rotated with a page-level rotation flag are handled, so the watermark still appears at your chosen angle on screen.

Order of operations

Watermark near the end of your workflow. Merge, split, rotate and compress the document first with Merge PDF, Split PDF, Rotate PDF and Compress PDF, then stamp it, then protect it if needed. Note that using the lossy mode of the compressor after watermarking turns the whole page, including the watermark, into an image.

Privacy and limits

The watermark is added in your browser. The file is never uploaded, so it is safe for contracts, proposals and internal reports. Files up to 200 MB are accepted, and password-protected files must be unlocked first with Unlock PDF. The original is untouched: the tool downloads a new file named with -watermarked at the end.