Peace Harbor Studios
DeckMerge app icon

macOS App · Made by Peace Harbor Studios

Merge PowerPoint, Keynote & Google Slides into One Presentation — on Your Mac

DeckMerge combines several presentations into a single clean file, entirely on your Mac. Embedded video survives, each one keeps its own design, and nothing is ever uploaded.

Start Free Trial See How It Works

14-day free trial · then $29 once · 3-seat license · lifetime updates

Built for Messy, Real-World Presentations

The things that usually break when you combine presentations — video, themes, aspect ratios — are exactly the things DeckMerge gets right.

Entirely on Your Mac

No upload, no cloud account, nothing leaves your machine. Your files and the merged result are processed locally — ideal for confidential or client material.

Embedded Video Survives

DeckMerge clones each slide's full part graph — layout, master, theme, and media — so movies and audio carry through to the finished presentation and still play.

Each Presentation Keeps Its Look

Themes are duplicated, not flattened. A merge of mixed-theme files preserves each one's original styling instead of forcing a single template onto everything.

One Clean Canvas

Mixed 4:3 and 16:9 slides are normalized onto a single standard canvas, each fitted with its aspect preserved and centered — never stretched. Choose Auto, 16:9, or 4:3.

Optional Separators

Drop a black, white, or no separator slide between files so the seams between sections read cleanly in the final presentation.

PowerPoint, Keynote, or Impress Out

Bring in PowerPoint (.pptx, .ppt), Keynote (.key), LibreOffice Impress (.odp), and Google Slides exported as .pptx — and export the merged result as PowerPoint, Keynote, or Impress, or publish it straight to Google Slides.

How It Works

  1. Add Your Files

    Drag in the PowerPoint, Keynote, and Google Slides files you want to combine, in the order you want them.

  2. Choose Canvas & Separators

    Pick a single output canvas — Auto, 16:9, or 4:3 — and whether to slip a black, white, or no separator slide between presentations.

  3. Export One Merged Presentation

    DeckMerge stitches everything into one file — video intact, each one's design preserved — and saves it as PowerPoint, Keynote, or LibreOffice Impress, or publishes it to Google Slides.

A Look Inside

A focused, native macOS app — add files, set two options, merge.

Drag files in — PowerPoint, Keynote, LibreOffice, and Google Slides mix freely.
Your files in order — .key, .odp, and .pptx side by side; drag rows to rearrange.
Export as PowerPoint, Keynote, or OpenDocument — or publish to Google Slides.
Exactly what happens when you merge — and it all runs locally on your Mac.
Done — one clean merged presentation, video intact, saved on your Mac.

Formats

Bring In

  • PowerPoint — .pptx and legacy .ppt
  • Keynote — .key
  • LibreOffice Impress — .odp
  • Google Slides — downloaded as .pptx

Export As

  • PowerPoint — .pptx
  • Keynote — .key
  • LibreOffice Impress — .odp
  • Google Slides — published to your account when you connect Google (within Slides' upload limits)

Frequently Asked Questions

How Do I Merge Multiple PowerPoint Files into One on a Mac?

Open DeckMerge, add the PowerPoint files you want to combine, pick a canvas size and separator style, and export. DeckMerge stitches every slide into one .pptx (or .key / .odp) on your Mac — no uploading and no online converter.

Can I Combine PowerPoint and Keynote Presentations Together?

Yes. DeckMerge accepts PowerPoint (.pptx and .ppt), Keynote (.key), LibreOffice Impress (.odp), and Google Slides files downloaded as .pptx in a single merge, and exports the result as PowerPoint, Keynote, or Impress — or publishes it straight to Google Slides when you connect your Google account.

Will My Embedded Videos Still Play After Merging?

Yes. DeckMerge clones each slide's full part graph — layout, master, theme, and media — so embedded video and audio carry through to the merged presentation and keep playing.

Does Merging Change My Slide Designs or Themes?

No. Each presentation's theme is duplicated rather than flattened, so a mixed-theme merge preserves each one's original look instead of forcing one style onto all the slides.

What Happens When I Merge 4:3 and 16:9 Slides Together?

DeckMerge normalizes every slide onto one standard canvas. Slides with a different aspect ratio are fitted in with their proportions preserved and centered (letterbox or pillarbox) — never stretched. You can choose Auto, 16:9, or 4:3.

Does DeckMerge Upload My Presentations to the Cloud?

No. The entire merge runs on your Mac. Your files and the merged result are never uploaded to us — there is no account and no cloud service involved in producing your file.

Can DeckMerge Combine Google Slides Presentations?

Yes. Download each Google Slides presentation as PowerPoint (.pptx) from Google Slides, then add it to DeckMerge like any other file.

Can DeckMerge Merge LibreOffice Impress (.odp) Files?

Yes. LibreOffice Impress files (.odp) come in just like PowerPoint files, mix freely with .pptx, .ppt, and .key in a single merge, and the finished presentation can be exported as .odp too.

What Does DeckMerge Cost, and Is There a Free Trial?

DeckMerge is a 14-day free trial, then a one-time $29 purchase. One license covers up to 3 Macs and includes lifetime updates.

What Macs Does DeckMerge Support?

DeckMerge runs on Apple Silicon Macs (M1 or newer) on macOS 13 Ventura or later. Windows and Linux versions are in development.

Try DeckMerge Free

$29 once · 3-seat license · lifetime updates

Start with a 14-day free trial — no account, nothing uploaded.

Start Free Trial