Watermarking a document before you share it sounds like it should take ten seconds. On Mac, the tools are all built in, but they’re just spread across three different apps, which is why the first search usually ends in frustration.
This covers three built-in approaches: Pages’ background-objects feature for Pages files, Preview’s Markup toolbar for PDFs, and the Print dialog’s Watermark section for a quick text stamp on anything you can print. Third-party options are at the end for batch work.
Add a Watermark to a Pages Document
Pages 15 on macOS 26 Tahoe has a proper watermark workflow built in. You add the watermark once and it appears in the same position on every page automatically. No copying and pasting per page.
Step 1: Insert a text or image object
Open your document in Pages. For a text watermark, choose Insert > Text Box from the menu bar and type your text: “Confidential,” your company name, whatever fits.
For a logo or image watermark, choose Insert > Choose and select your image file.
Step 2: Format it
Select the object. In the Format sidebar on the right, set the font, size, and color. Large, light gray text is the standard, visible at a glance without competing with the content.
To place it diagonally, drag the rotation handle on the selected object, or type a specific angle in the Arrange tab of the sidebar.
Step 3: Lower the opacity
Click the Style tab in the Format sidebar and reduce the Opacity value. Between 15% and 30% keeps the content underneath readable. Go too high and the watermark vanishes; too low and it looks like a stamp.
Step 4: Move it to the background
Position the object where you want it. Then choose Arrange > Section Masters > Move Object to Section Master from the menu bar. This locks it into the background and replicates it across every page in that section.
Editing the watermark later
Choose Arrange > Section Masters > Make Master Objects Selectable. That unlocks background objects so you can select, adjust, and re-send them to the master layer.
Exporting
Choose File > Export To > PDF or print. The background watermark carries through automatically.
Add a Watermark to a PDF Using Preview
Preview handles PDF watermarking through its Markup toolbar. There’s no dedicated “Watermark” button. Knowing that upfront saves you ten minutes of hunting. What you’re doing is adding a styled text object at low opacity, which functions exactly as a watermark.
The limitation: Preview applies it page by page. No batch option exists. For anything longer than a few pages, skip to the third-party section below.
Step 1: Open the PDF
Double-click the PDF in Finder, or right-click it and choose Open With > Preview.
Step 2: Show the Markup toolbar
Click the Markup icon (the pen-tip icon) in the toolbar, or choose View > Show Markup Toolbar.
Step 3: Add and style the text
Click the Text tool (“T” icon). A text box appears; click into it and type your watermark text.
Select the text, then use the font and size controls in the Markup toolbar to set the appearance. To adjust transparency, click the color swatch and choose Show Colors. In the Colors panel, lower the Opacity slider until the text looks appropriately light.
Step 4: Position and rotate
Drag the text box to the center of the page. For a diagonal watermark, use a two-finger rotation gesture on your trackpad. If that doesn’t work on your setup, place the text and use a dedicated app for rotation instead.
Step 5: Copy to each page
Style the watermark the way you want it, then copy the text box (Cmd + C) and paste it (Cmd + V) onto every page in the sidebar. For a 30-page document, that’s 30 pastes; Preview has no global apply option.
Step 6: Lock it in
After watermarking all pages, choose File > Print, then click the PDF dropdown in the bottom-left corner of the dialog and select Save as PDF. This re-renders the pages with the watermark baked into the page content rather than sitting as an editable annotation. Much harder to strip.
Adding an image watermark
In the Markup toolbar, look for an Image insertion option or use the Insert menu. Add your image, a logo or branding graphic, then resize it, reduce the opacity the same way, and copy it to each page.
Quick Text Watermark: The Print Dialog
This is probably the least-known built-in method. The Print dialog in macOS 26 Tahoe includes a Watermark section that works with Pages, Preview, TextEdit, Safari, and most other apps that can print.
Text-only, no image support. And it doesn’t modify your source file; the watermark only appears in the saved PDF output. If you want to keep your original document clean and watermark only exported copies, this is the right approach.
Step 1: Open Print
Press Cmd + P or choose File > Print.
Step 2: Expand the dialog and find Watermark
If the print dialog is compact, click Show Details. Scroll down in the options panel until you see a Watermark section.
No Watermark section? The app has its own custom print panel that hides it. Open the file in Preview and try from there.
Step 3: Configure the watermark
- Toggle Apply Watermark on.
- Type your watermark text in the field.
- Click Font to set typeface and size.
- Use the alignment and location controls to choose diagonal, header, or footer placement.
- Check the preview in the sidebar before committing.
Step 4: Save as PDF
Click the PDF dropdown in the bottom-left and choose Save as PDF. The output file has the watermark on every page, baked in.
Third-Party Options for Batch Watermarking
If you’re regularly watermarking multiple PDFs, Preview’s per-page workflow will wear you down fast. A few well-regarded Mac tools handle this properly.
WatermarkPDF is a dedicated Mac App Store app built entirely around batch text and image watermarking. Set your preferences once, including font, color, opacity, placement, and page ranges, and process as many files as you need. Everything stays local.
PDFgear is free and a capable general-purpose PDF editor for Mac. It supports text and image watermarks with opacity and size controls. A good starting point if you want a full PDF editing tool alongside watermarking.
Adobe Acrobat gives the most granular control: Edit PDF > Watermark > Add lets you watermark across multiple files in a batch. Worth it if you’re already on a Creative Cloud subscription, but hard to justify purely for watermarking.
For occasional single-file work, the built-in methods above are enough. For anything at scale, a dedicated tool pays for itself in time saved.
Troubleshooting
No Watermark section in the Print dialog. Click Show Details first to expand the full dialog. If the section still doesn’t appear, the app is using a custom print panel. Open the file in Preview and print from there.
Watermark is too dark or obtrusive. In Preview, select the text box, click the color swatch in the Markup toolbar, open Show Colors, and lower the Opacity slider. In Pages, use the Opacity control in the Style tab of the Format sidebar. Aim for 15–25% with a gray or near-white color.
The watermark got removed. If you saved directly from Preview without the Print > Save as PDF step, the watermark may have been stored as an editable annotation layer, which basic tools can strip. Re-open the file, choose File > Print, and use Save as PDF from the PDF dropdown. That flattens the watermark into the page content.
Watermark only shows on page one. In Pages, you may have added the object to the document layer rather than the section master. Delete it and repeat Step 4 using Arrange > Section Masters > Move Object to Section Master. In Preview, you need to copy and paste the watermark onto every page; there’s no shortcut for that.