# How to combine PowerPoint presentations into one

Source: https://mergevanta.com/guides/combine-powerpoint-presentations
Published: 2026-10-21
Updated: 2026-10-21
Author: Mergevanta

> Merge PowerPoint decks with Reuse Slides in PowerPoint, or combine whole .pptx files in one step with Mergevanta — keeping themes, notes and media.

## Quick answer: How do I combine multiple PowerPoint presentations into one?

In PowerPoint, open the main deck, choose Home › Reuse Slides (or New Slide › Reuse Slides), browse to the other presentation and insert its slides, ticking Keep source formatting to preserve their design. To merge whole decks in one step, add the .pptx files to Mergevanta's Merge PowerPoint tool and press Merge.

## Method 1: Reuse Slides in PowerPoint

1. Open the presentation the other slides should join, and click the slide after which they should appear.
2. On the Home tab, choose Reuse Slides. In older versions, click the arrow under New Slide and choose Reuse Slides.
3. Browse to the other presentation. Its slides appear in the Reuse Slides pane.
4. Tick Keep source formatting if the slides should keep their original design, then click each slide you want to insert.
5. Save the combined presentation.

## Method 2: Merge whole decks with Mergevanta

1. Open [Mergevanta's Merge PowerPoint page](https://mergevanta.com/merge-powerpoint) in any browser.
2. Add two or more .pptx files.
3. Drag the decks into order — the first deck sets the slide size.
4. Press Merge and download one .pptx with every slide, its notes and its media.

Each deck keeps its own theme and layouts. If the decks use different slide sizes, such as 16:9 and 4:3, Mergevanta keeps the first deck's size and warns you so you can adjust afterwards.

## Sharing the combined deck as a PDF

If you only need to share or print the slides, export each deck as a PDF from PowerPoint (File › Export) and combine the PDFs with [Merge PDF](https://mergevanta.com/merge-pdf). A PDF looks the same on every device and can't be edited by accident.

## Which method should you use?

|  | PowerPoint Reuse Slides | Mergevanta Merge PowerPoint |
| --- | --- | --- |
| Needs PowerPoint installed | Yes | No — any browser |
| Pick individual slides | Yes | No — whole decks |
| Merge several decks at once | One deck at a time | Yes |
| Watermark | None | None |
| Cost | Included with Microsoft 365 or Office | Free |

## In short

- PowerPoint's Reuse Slides inserts individual slides; tick Keep source formatting.
- Mergevanta merges whole decks at once, keeping themes, layouts and speaker notes.
- The merged deck uses the slide size of the first file.

## Frequently asked questions

### How do I merge PowerPoint files without losing formatting?

In PowerPoint, tick Keep source formatting in the Reuse Slides pane. With Mergevanta, each deck automatically keeps its own theme and layouts.

### Can I combine PowerPoint presentations online for free?

Yes. Mergevanta's [Merge PowerPoint](https://mergevanta.com/merge-powerpoint) tool is free, with no sign-up and no watermark on your slides.

### What happens if the presentations are different sizes?

The merged deck uses the first file's slide size. Mergevanta warns you about the mismatch so you can resize slides in PowerPoint afterwards.

### Can I combine Google Slides presentations?

Download each one as a .pptx (File › Download › Microsoft PowerPoint), merge them with Mergevanta, then upload the combined deck back to Google Drive.

Try it: [Merge Slides](https://mergevanta.com/merge-powerpoint) — free, no watermark, no sign-up.