Add Watermark to PowerPoint

Four steps, and the third is the one worth slowing down for.

1. Open your presentation. Drag a .pptx, .pptm, .potx, .potm, .ppsx or .ppsm file onto the page. It is read on your device and never uploaded.
2. Choose text or a logo. Type the words you want, or pick a PNG, JPEG, WebP, GIF or SVG logo. Set the font, size, colour, angle and opacity.
3. Choose where it goes. Place one mark in any of nine positions, or tile it across the slide. Apply it to every slide, only odd or even ones, a range, or the slides you pick.
4. Preview and download. The preview shows the real slide with your watermark on it. Download the presentation in the same format it arrived in.

Apply a consistent text or logo watermark across PowerPoint slides, with precision controls for style, position and visibility. Everything happens on your device: the presentation is never uploaded, and the file you download is the same format you started with.

• Text or logo: Type words such as DRAFT or CONFIDENTIAL, or bring a PNG, JPEG, WebP, GIF or SVG logo.
• One mark or a grid: Place it in any of nine positions, or tile it across the slide so a crop cannot remove it.
• Full style control, free: Font, size, colour, bold, italic, angle and opacity are all available on every plan.
• The slides you actually mean: All, odd, even, a typed range, or slides you click — counted in the order you see them.
• Each slide or the slide master: Master placement covers slides you add later and cannot be nudged out of position.
• Reversible: Remove takes out every mark this tool added, and the logo image with it.
• Any aspect ratio: 16:9, 4:3, portrait and custom slide sizes are all measured from the file itself.
• Private: Nothing is uploaded, so it keeps working with the network switched off.

A text watermark is a word or short phrase drawn onto the slide — DRAFT, CONFIDENTIAL, a client name, a date. It stays crisp at any zoom because it is real text rather than a picture, and it adds only a few hundred bytes to each slide it appears on.

Logo watermarks

A logo watermark uses your own image. PNG, JPEG and GIF are embedded as they are; WebP, AVIF, BMP and SVG are converted to PNG first, because PowerPoint does not read those formats reliably and a deck carrying one shows an empty box on the machine it was made for. An SVG is rasterised at a generous size so it stays sharp when you scale it up. Whatever the source, the image is stored once in the file and referenced by every slide that uses it, so marking 200 slides costs one copy of the logo rather than 200.

Why tile a watermark

A single centred mark is easy to crop out of a screenshot. A tiled grid is not: the repeat covers the whole slide, so any crop large enough to be useful still carries the mark. Set the columns and rows, and stagger alternate rows so the pattern reads as deliberate rather than as a printing fault. The size control tracks the grid — at ten columns a tile is a tenth of the slide, and the tool will not offer a size that cannot fit inside one.

Position, angle, opacity and layer decide how the mark reads. Nine anchor positions cover the centre, the four corners and the four edge midpoints, each inset by a margin measured from the rotated shape so a diagonal mark sits inside the slide the way a horizontal one does. The angle runs from -180° to 180°, with the usual -45° diagonal one press away. Opacity runs from 1% to 100%. Layer decides whether the mark sits above the slide content or behind it — behind is right for a pale background wash, above for a status stamp that must not be obscured by a full-bleed photograph.

Slide numbers here mean the order you see in PowerPoint. That sounds obvious and is the single thing most watermarking tools get wrong: a presentation stores its slides as numbered parts inside the file, and those numbers stop matching the running order the first time you drag a slide in the thumbnail rail. A tool that reads the stored numbers will happily mark three slides when you asked for slides 1 to 3 — just not those three, with no error and a file that opens perfectly. This tool reads the presentation's own slide list instead, so "slides 1-3" always means the first three slides you see.

Beyond all, odd and even, you can type a range such as 1-3,5,8-10, or switch to the picker and click slide numbers directly. The count beneath the control tells you how many slides will be marked before you run anything, so a range that matches nothing says so rather than producing an empty result. Hidden slides can be skipped in one press.

Microsoft's own documented way to watermark a presentation is to put the mark on the slide master, and it is the better option more often than people expect. A shape on the master appears on every slide built from it, cannot be selected or moved on an individual slide, and is inherited by slides you add afterwards — so a deck that grows keeps its watermark without anyone remembering to reapply it.

There is one trap, and this tool handles it for you. A layout can be set to hide the master's shapes, and a slide can be set to hide both the layout's and the master's. Placing a mark only on the master therefore misses every slide built from such a layout — often the title and section slides. Rather than changing your deck's inheritance settings, the mark is also placed directly on the layouts and slides that opt out, so coverage is complete and nothing else about the presentation changes.

Switch the mode to Remove and every mark this tool placed comes out — from the slides, from the layouts and from the slide master — along with any logo image it embedded and the relationships that pointed at it, so the file returns to roughly its original size. Re-running the tool with different settings does the same thing automatically: watermarks replace rather than stack, so ten changes of mind leave one mark rather than ten. Shapes you drew yourself are ordinary slide content and are never touched, even if one of them happens to contain the words the tool uses to recognise its own.

A watermark tells the reader what a copy of a document is for. DRAFT stops an unfinished deck being quoted as final. CONFIDENTIAL sets the expectation before anything is forwarded. A client's name on a shared review copy makes it obvious where a leaked screenshot came from. A logo turns a template into something branded without touching a single slide layout. None of these are security — anyone determined can remove a watermark — but all of them change what happens by accident, which is where most documents go astray.

A PowerPoint file is a package of parts. This tool reads the package index, works out which slides you asked for from the presentation's own slide list, and rewrites only those parts, adding one shape for each place the mark appears. Every other part — images, video, fonts, animations, speaker notes, the macro project in a .pptm — is copied across still compressed, without ever being unpacked. That is why the size of your presentation barely affects how long it takes: a 40-slide deck with 40 photographs is watermarked in about 23 milliseconds, and the work happens off the main thread so the page stays responsive throughout.

Watermarking runs entirely on your device, not our servers. The presentation is opened, the marked slides are rewritten and everything else is copied straight through, so a 40-slide deck with 40 photographs finishes in about 23 milliseconds.

Six formats go in, and the same one comes out. That matters more than it sounds: a macro-enabled .pptm saved back as .pptx keeps its macro project in the file but PowerPoint will no longer run it, so the container travels with the presentation.

• .pptx — a standard presentation. The common case.
• .pptm — macro-enabled. The macro project is copied through untouched and the file stays macro-enabled.
• .potx and .potm — templates. Watermark a template and every presentation built from it starts with the mark.
• .ppsx and .ppsm — slide shows, which open straight into presentation mode. Exactly the kind of file that gets emailed to people who should not edit it.

Legacy .ppt and .pps files use the pre-2007 binary format and cannot be read on your device: open one in PowerPoint and choose File → Save As → PowerPoint Presentation to get a .pptx. OpenDocument .odp and Keynote files are not supported either. If you meant to watermark a PDF, there is a tool for that.

Every style control is free. The text, the font, the size, the colour, bold and italic, the angle, the opacity, all nine positions, tiling, slide selection, slide-master placement, layer order and removal work exactly the same on both plans, and so does the logo watermark. Free handles one presentation at a time, up to 100 MB, and re-encodes a logo larger than 1920 pixels on its longest edge.

Pro adds the two things that are genuinely a matter of scale: up to 50 presentations in one run, delivered as a single archive, and your logo embedded at its original resolution rather than resampled. There is no size cap on Pro — the limit is what your device can handle, which is what the plan promises.

• Change Slide Size
• Compress PowerPoint
• Merge PowerPoint
• PowerPoint Tools
• Split PowerPoint
• Watermark a PDF