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What This Tool Offers
This free tool adds a centered text watermark to every slide of a PowerPoint (PPTX) in your browser. Set the text, opacity, font size, rotation, and color; use the live preview, then download the watermarked presentation. The watermark is placed in the center of each slide and adapts to your presentation’s slide dimensions.
- Centered on every slide: The watermark is positioned in the center of each slide; the tool reads your presentation’s slide size so it works with 16:9, 4:3, and other aspect ratios.
- Text and opacity: Enter the watermark text (e.g. DRAFT, CONFIDENTIAL) and set opacity with the slider (10–100%).
- Font size, rotation, color: Choose small, medium, or large; horizontal (0°) or diagonal (-45°, -30°, 45°); and black, gray, or dark red.
- Live preview and UX: See how the watermark will look before downloading. File size is shown; use Choose another file or Clear as needed.
- Client-side and private: Your file is never uploaded; processing runs in your browser.
Watermark Placement and Options
The watermark is centered on each slide (horizontally and vertically). The tool reads the slide dimensions from your PPTX (e.g. 16:9 or 4:3) so the text box matches the slide and the text stays centered. You can customize the text (e.g. DRAFT, CONFIDENTIAL, INTERNAL), opacity (slider from 10% to 100%), font size (small, medium, large), rotation (horizontal or diagonal for a classic watermark look), and color (black, gray, or dark red). The live preview updates as you change options.
Why Add a Watermark?
Watermarks help mark drafts, protect ownership, or label content as confidential or internal. A subtle, centered text watermark is common for shared or pre-release presentations and keeps your branding or status visible without blocking the main content.
How It Works
Upload a PPTX (or choose another file to switch). Enter the watermark text, set opacity, font size, rotation, and color; the live preview updates as you change options. Click Download with watermark to apply the centered watermark to every slide and save the file. Your file never leaves your device.
Powered by browser APIs and client-side processing.
Frequently Asked Questions
Is my file secure?
Yes. Processing runs entirely in your browser. Your PPTX never leaves your device; no uploads and no server processing.
Where does the watermark appear on the slide?
The watermark is centered on each slide (both horizontally and vertically). The tool uses your presentation’s slide dimensions so the watermark fits any aspect ratio (e.g. 16:9 or 4:3).
Can I customize the watermark?
Yes. You can set the text (e.g. DRAFT, CONFIDENTIAL), opacity (10–100%), font size (small, medium, large), rotation (horizontal or diagonal: -45°, -30°, 45°), and color (black, gray, dark red). A live preview shows the result before you download.
Will the watermark appear on every slide?
Yes. The watermark is applied to all slides in the presentation, centered on each slide.
Can I use an image as watermark?
This tool adds a text watermark only. For image watermarks, use desktop PowerPoint or another tool.