Add a watermark to a PDF

What the watermark tool does

A watermark in Khallas is one line of text you type, such as Confidential, Draft, your organisation's name, or what the copy is for, drawn across the middle of every page in dark translucent ink. You control three things, because those three are what actually change how the sheet looks: the opacity, the size of the mark as a share of the page width, and whether it is tilted or straight. A fourth option adds a small line under the mark carrying today's written-out Hijri date in the Umm al-Qura calendar.

The mark is drawn by your browser's own text engine and then merged into the page as a transparent layer, which is what makes Arabic come out connected and correctly shaped, unlike many tools that break Arabic letters apart. All of it runs on your device: the file is never uploaded and never passes through us, so the contract or bank statement you stamp Confidential never leaves the browser.

Before you press the button you see the page in front of you with the mark on it exactly as it will print, and you can step through the pages to check where it lands on each one. Any change to opacity, size or tilt shows on the sheet in the same moment, because the preview and the finished file draw the mark the same way.

When you need a watermark on a PDF

The most common use in Saudi Arabia and the Gulf is a copy of an ID, an iqama or a passport handed to a real-estate office, a car rental company or an employer: a line written across the image states what the copy is for, such as For the lease contract only, so the same scan cannot be reused for anything else. Proposals and studies sent out before approval are stamped Draft so nobody circulates them as final.

In everyday work, internal memos and financial reports are stamped Confidential before they go around, engineering and consulting offices stamp their name across drawings and proposals, and a student writes their name and university number on the summaries they share with classmates. In all of these the point is a visible mark on the sheet itself, not a line in the file's properties.

What opacity and size to choose

The opacity slider runs from five per cent to fifty and starts at fifteen. Ten to twenty is enough for a document read on screen: the mark is legible and does not hide the lines under it. Push it to thirty or more if the file will be printed or photocopied, because printing and copying lighten the mark by a step or two.

Size has three steps, each a share of the page width: small is about half the width and suits a long mark such as a whole sentence, medium is about two thirds and is the default, and large nearly fills the width and suits a single short word. Tilt is one fixed angle you turn on or off, chosen because it reads well in both Arabic and English text.