Merge PowerPoint to PDF: Combine Several Presentations into One PDF

A set of slide decks is awkward to send as separate PowerPoint files, and the people getting them may not have PowerPoint at all. Merging PowerPoint to PDF puts every slide from every presentation into one document that opens on any device.

Our Merge PowerPoint to PDF tool converts each PPT, PPTX or ODP file with LibreOffice Impress, then joins the results into a single PDF in your browser. The slides follow the order of the files on the screen, and we don't add a watermark.

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How to merge PowerPoint files into one PDF

Whatever order the files have on the screen is the order of the slides in the PDF.

1. Click Choose Files and pick the first presentation, or drag it onto the page.
2. Add the next presentations with the plus button, in the order you want them in the PDF.
3. Remove any file you added by mistake.
4. Click Merge to PDF and wait while each presentation converts.
5. Click Download to save the merged PDF.

How the PowerPoint to PDF merge works

Each presentation gets uploaded and converted on our server by LibreOffice, using the command line conversion that the LibreOffice help on start parameters documents. LibreOffice's Impress export makes one PDF page per slide.

Then your browser copies the pages of all the PDFs into one new document with the pdf-lib library, whose copyPages method moves pages between PDF documents. Every presentation has to convert before the merged PDF can be made.

• Accepted files: .ppt, .pptx and .odp, up to 25 MB each.
• Checked first: a damaged or renamed file gets refused before conversion, and a password-protected one can't be converted.
• Deleted automatically: we remove the uploads and the converted PDFs from our server within two hours.

What the merged PDF keeps from your slides

Each deck keeps its own slide size, because the pages are copied as they are and never rescaled. In October 2026 we merged a 4:3 deck of 2 slides with a 16:9 deck of 3 slides, one of them hidden. The merged PDF had 4 pages: two of 720 by 540 points from the 4:3 deck, then two of 720 by 405 points from the 16:9 deck.

The bookmarks disappear because pdf-lib's copyPages copies the pages but not the outline pointing at them. If your readers need to jump between decks, convert each deck on its own with PowerPoint to PDF, which keeps one bookmark per slide.

Mixed slide sizes look uneven once the PDF is projected or printed. For a tidy handout, set every deck to the same size in PowerPoint under Design, Slide Size before you upload.

What happened when we tested Merge PowerPoint to PDF

We uploaded our small test file test.pptx (36.6 KB, a one-slide presentation) twice and merged the two copies in upload order, with no other settings. The result was one PDF of 28.2 KB with 2 pages, ready 1.3 seconds after we clicked Merge to PDF on our local test server. Tested in October 2026.

Large merges and separator pages

The page doesn't limit the number of decks, only the size of each file (25 MB). In October 2026 we merged ten 8.5 MB decks of 20 photo slides each in Chrome on a desktop computer, and the 200-page PDF of 91.1 MB was ready 12.9 seconds after we clicked Merge to PDF.

The join happens in your browser, and by the end of that merge the page's scripts were using about 381 MB of memory. On a phone or an older laptop, merge a few decks at a time if the page slows down, then join the batches.

There's no option for a divider between decks. Put a one-slide title deck between two decks in the upload order, or insert a blank page afterwards with Add PDF Pages: after page 20 of a two-deck merge, the inserted blank page took the slides' own 16:9 size, so it doesn't stick out when projected.

Reordering, shrinking and combining other files

To change the order of single slides after merging, open the PDF in Organize PDF. A deck full of photos can make a big file, and our PDF optimization tools make it smaller for email.

For a single presentation, PowerPoint to PDF is quicker. To combine slides with Word or Excel files in one PDF, use Merge Office to PDF, and for PDFs you already have, our tools for merging and organizing PDFs.

Frequently Asked Questions about merging PowerPoint to PDF

Can I merge more than two PowerPoint files?

Yes. There's no limit on the number of files, only 25 MB per file, and they're merged in the order shown on the screen. Ten 20-slide decks took 12.9 seconds in our test.

Can I mix PPT, PPTX and ODP files?

Yes. All three formats can go into the same merged PDF.

Are animations and transitions kept?

No. A PDF is static, so each slide shows up as a still page.

What happens if one presentation fails to convert?

You only get the merged PDF when every file converts. Remove the file named in the error message, or repair it in PowerPoint, and merge again.

Can I merge password-protected presentations?

No. Take the password off in PowerPoint before you upload the file.

Does the merged PDF keep bookmarks for each slide?

No. A single conversion gets one bookmark per slide, but the merged PDF has none. Convert decks one at a time if you need the bookmarks.

What if my decks have different slide sizes?

Each page keeps the size of its own deck. In our test, 4:3 pages of 720 by 540 points sat next to 16:9 pages of 720 by 405 points.

Combine your presentations into one PDF