What is an ODP file?

ODP is a container: a wrapper that holds streams encoded by something else. It is used for editing.

The extension is .odp, and the full name is OpenDocument Presentation. Both matter less than what the file can hold, which is what the rest of this page is about.

OASIS published it in 2005. The specification is ISO/IEC 26300.

Age is worth knowing here for one practical reason: the older a format is, the more programs have had time to learn it.

It is published in full, so anyone can implement it from the document rather than by inspection, which is why it turns up in so many programs and why files written twenty years ago still open. A published specification is not the same thing as a royalty-free one: where a format wraps a codec, the patent licensing is a separate question the standard does not settle.

ODP is not limited to one page, which matters when converting to something that is: one conversion produces one file holding a single page — the first one, unless the page is something the converter lets you pick.

ODP holds a presentation: one slide per screen, sized for a projector rather than for paper.

That is what decides how it converts: one page per slide, with the animations flattened, because a page cannot appear in stages.

LibreOffice Impress and Microsoft PowerPoint read it, and so do most programs of the same kind.

If a file will not open, the format is rarely the problem — it is more often that the program predates it. Converting to something older is the reliable way past that, and it is what the rest of this site is for.

No browser reads it.

That is the single most common reason to convert it: not that the format is bad, but that the place you want to show the file cannot read it.

ODP is meant to be opened and changed. Keep the file in this format for as long as the work is going on, and export from it whenever a finished copy is needed.

An ODP is an archive. Inside it are XML documents describing the slides, the master pages and the styles, plus a folder holding every image, chart and embedded object. Rename one to .zip and it opens like any other archive, which is occasionally the fastest way to recover a picture from a deck.

That structure is shared with PPTX, which is also a ZIP of XML, and it is why conversion between the two works as well as it does. The vocabularies differ; the shape does not.

LibreOffice Impress, mostly, and its predecessors. Also from public bodies working under open-format policies — several national and regional governments require OpenDocument for documents they publish or receive, and a presentation submitted to them may have to be ODP rather than PPTX.

The other route is a machine without Microsoft Office: a Linux desktop, a Chromebook, a school, a laptop where nobody bought a licence. Impress is free and its default output is ODP, so the file is a byproduct of what was available rather than a decision.

A slide deck is laid out against fonts. Open one on a machine that lacks them and a substitute is used, at different widths — so a heading that fitted on one line now takes two, a text box overflows, and a carefully positioned caption sits under the image instead of beside it.

This affects presentations far more than documents, because a slide has no reflow to absorb the difference. Stick to fonts that exist everywhere, or embed them if the software offers it. The reliable answer for a deck you will not be presenting yourself is to send a PDF, where the layout is fixed and the fonts travel inside the file.

Text, layout, images, tables and charts convert well in both directions — the formats describe the same kinds of thing. Slide masters and templates come across in structure, though a heavily customised master is worth looking at afterwards.

What degrades is the moving parts. Animations and slide transitions have different vocabularies in the two formats, so an effect either maps to the nearest equivalent or disappears; complex sequences with timing usually simplify. Embedded video and audio are the least reliable of all and often arrive as a broken placeholder. If a deck depends on media, test it on the machine it will be presented from rather than assuming.

PDF, unless they specifically ask for something editable. It cannot reflow, cannot lose a font, cannot fail to find a codec, and opens on every machine in every venue. The overwhelming majority of presentation disasters are avoided by this one decision.

When the deck must be editable — a shared template, a session where somebody else will add slides — send PPTX, because that is what the room will have. Keep the ODP as your own working copy. And if animations or embedded video are essential to the talk, take your own laptop; no format promises that a video will play on a machine you have never seen.

ODP stores speaker notes alongside each slide, and they survive conversion to PPTX. What varies is whether they survive conversion to PDF — that depends entirely on which layout is exported, and the default is slides only.

Worth knowing before a talk: exporting notes pages produces a document with each slide above its notes, which is what most people actually want as a personal reference. Handout layouts, with several slides to a page, are a separate export option and are the right thing to circulate afterwards to people who were not in the room.

Because the format is a ZIP, a damaged ODP is not necessarily a lost deck. Rename it to .zip, open it, and the images are all sitting in a media folder in their original resolution. The text is in an XML document and is readable, if unpleasant to look at.

This is a real recovery route and it works when the presentation software refuses the file. It also answers the more mundane question of how to get the full-size original of a picture out of a deck without screenshotting a slide.