Convert ODP to PPT
This conversion travels in two unhelpful directions at once: from a published open standard to a proprietary binary, and from a current container to one that predates 2007. The file gets bigger, harder to inspect and more likely to be quarantined by a mail filter. Do it when a specific old machine demands it, and not otherwise.
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What it does
- Output opens in presentation software written before 2007
- Slides, text and images are carried across
- The file will be substantially larger than the ODP
How to use ODP to PPT
- 1
Confirm the destination really needs it
If the old machine only has to display the slides, PDF is usually accepted too and costs nothing.
- 2
Upload the .odp
An Impress presentation. Embed unusual fonts in the source first.
- 3
Test on the target machine
The entire purpose is one specific old system. Opening it in a modern application tells you very little.
How it works
The ODP is unzipped, its slides and shapes are read from the content XML, and the deck is written into the legacy compound binary structure. The result stays editable in old PowerPoint; this is a format conversion, not a flattening.
Why the file grows
OpenDocument is a ZIP: its XML compresses and its images are stored already compressed. The legacy binary is a flat structure holding media raw. A deck with photographs commonly triples or quadruples in size on the way down, which is worth knowing before you try to email the result to the person with the old machine.
Ask about PDF first
This is the recommendation that saves the most trouble. Most old systems that accept .ppt also accept PDF, and if the requirement is to show the slides rather than to edit them, PDF wins on every axis: identical appearance, no size penalty, no feature loss, no mail filtering.
The downgrade is only correct when the destination genuinely needs a presentation file it can open and change.
What to check on the target machine
Fonts first, because substitution is immediately visible and changes where text sits. Then animations, which frequently simplify. Then the file size against whatever limit stands between you and the machine.
Testing anywhere other than the target machine proves very little, since the whole point of the conversion is one specific old piece of software.
Two steps backwards in one conversion
This gives up the open format and the modern container at the same time. ODP is a
documented ZIP of XML; .ppt is a proprietary binary from the 1990s that was
reverse-engineered for years before Microsoft published its layout.
There is exactly one good reason to do it: software that reads nothing else. Old
presentation systems, some conference room hardware, and a certain amount of
institutional software were built against .ppt and will not open .pptx.
If the other end can read .pptx, convert to that instead. It is the same
transfer of your deck into Microsoft's world without also traveling twenty-five
years into the past.
Check the deck opens before you rely on it
Because this crosses two boundaries at once — open format to proprietary, modern container to a 1990s binary — it is the presentation conversion most likely to come out changed.
The things to look at are the ones that did not exist when .ppt was designed:
newer shape effects, gradients with transparency, recent chart types, and anything
Impress drew with its own tooling. All of them have to be approximated.
Open the result in whatever will actually present it, and page through. A deck that renders correctly in LibreOffice is not evidence it will render correctly in the software you converted it for.
Examples
A deck for an unattended kiosk
Simple and static, which is the shape that downgrades safely. The kiosk software accepts .ppt and nothing else, which is the only reason this conversion happened.
A deck that would have been fine as a PDF
Nothing here needed a presentation file. A PDF would have opened on the same machine, kept the appearance exactly and avoided the size and the filtering.
Frequently asked questions
Why is this called two downgrades?
Because it gives up two independent things. OpenDocument is a published ISO standard whose files unzip into readable XML; .ppt is a proprietary compound binary. Separately, the legacy container stores media raw, so the file grows several times over and carries the extension mail gateways treat with suspicion. Neither loss buys anything except compatibility with old software.
Would a PDF work instead?
Very often, and it is worth asking before converting. If the destination needs to display the slides rather than edit them, PDF is accepted about as widely as .ppt on old systems, preserves the appearance exactly, does not balloon in size and is not quarantined. Reserve the downgrade for systems that genuinely require an editable presentation file.
What is most likely to look wrong?
Fonts, then animations. A typeface that is not installed on the old machine will be substituted, which changes line breaks and can push text out of its box — embed fonts in the source deck to prevent this. Animations and transitions defined in Impress often have no equivalent in a decade-old PowerPoint and will simplify or drop.