ODP to PowerPoint

Convert ODP to PowerPoint

An .odp file is Impress's native document: a ZIP package of OpenDocument XML written to the ODF standard. A .pptx expresses the same idea through a different schema — Microsoft's Office Open XML. Both describe slides, placeholders, shapes and notes, but they describe them with different vocabularies, which makes moving between them a translation rather than a rename. LibreOffice performs that translation here: it opens the presentation with its own Impress engine and re-emits every slide through PowerPoint's export filter.

Where the two presentation models diverge

Most of a deck crosses over untouched — slide order, text and bullet levels, pictures, tables, hyperlinks and notes. The friction is concentrated in four places:

• Masters and layouts. ODF gives a master page one attached set of styles; OOXML splits the same job between a slide master and a family of layouts beneath it. That mapping is approximate, so a bespoke Impress master usually becomes a single generated PowerPoint layout, and custom placeholders can land as ordinary text boxes.
• Motion. Impress describes animation with SMIL timing, PowerPoint with a timing tree of its own. Plain entrance effects and everyday transitions generally survive; elaborate sequences do not.
• Embedded objects. A chart or sheet you pulled in from Calc is an ODF object with no direct counterpart, so it typically arrives as an image that still looks correct but can no longer be edited in place.
• Media.Video and audio clips are the least reliable part of any deck exchange — check every slide that plays something before you rely on it.

Fonts are the first thing to check

More complaints after a presentation conversion trace back to type than to everything above combined, and the converter is only indirectly to blame. A deck built on Linux typically uses Liberation Sans or DejaVu; open it on a Windows PC that has neither and the words are redrawn in whatever the system offers instead. Because the stand-in has different letter widths, a heading that fitted on one line wraps onto two and a paragraph overruns the bottom of its box. Staying with faces both machines hold — or the metric-compatible pairs, Liberation Sans for Arial and Carlito for Calibri — removes nearly all of it.

Editing versus sending

Target .pptx when the recipient actually has to work on the deck in PowerPoint: add slides, rewrite the copy, restyle it, hand it back. If nobody needs to edit anything and you simply want the slides to look the same wherever they open, ODP to PDF freezes the fonts and layout you see now so nothing can reflow on another machine. When a colleague returns the deck as .pptx and you would rather carry on in Impress, PPTX to ODP reverses this conversion, and PPTX to PDF handles the fixed-page export from the Microsoft side.

Why this runs on our server

Rewriting a presentation between two XML schemas takes the full Impress import filter plus the PowerPoint export filter — a substantial piece of native office software that no browser ships. So the .odp travels to us over an encrypted connection, LibreOffice performs the rebuild in a workspace of its own, and the source and the result are both discarded once the download has been handed back. Nothing is stored, indexed or read afterwards.