PPT to ODP is a transcript, not the slides
LibreOffice Impress wants ODP, and you have a PowerPoint file.
Upload a PPTX. The tool reads the words on each slide and builds a plain ODP. A legacy .ppt file is rejected. Themes, animations, and embedded video are not copied.
Animations and masters
If the slides themselves are the deliverable, export from PowerPoint or LibreOffice. This download is the text of the deck, laid out simply.
PPT to ODP without the extra promises
PPT to ODP sits on this site because PPTX and ODP are not interchangeable, even when they look similar in a file list. LibreOffice Impress wants ODP, and you have a PowerPoint file. Decks are shared as PPTX when the other person will present, and as PDF when they only need to read. Use ODP when the next person works in LibreOffice and asked for that format.
Upload a PPTX. The tool reads the words on each slide and builds a plain ODP. A legacy .ppt file is rejected. Themes, animations, and embedded video are not copied.
Read this about PPTX before you upload
PPTX is a modern PowerPoint file. The design lives in the file. A text export only keeps what was written on the slides. Themes, animations, masters, and embedded video are not cloned by a browser tool.
Keep the PPTX. A PDF or Word file of the words is not the deck.
Read this about ODP before you send the download
The download has to be ODP, because that is the format the next step named. Use ODP when the next person works in LibreOffice and asked for that format. Slide text can be carried into a plain presentation.
Open the result before a talk. For a file that must look identical, ask for a PDF export.
Keep, check, then delete
People lose time when they convert before they know which rule failed. Size, pixel dimensions, codec, font encoding, and layout are different rules. PPT to ODP only addresses the PPTX to ODP step. LibreOffice Impress wants ODP, and you have a PowerPoint file. Upload a PPTX. The tool reads the words on each slide and builds a plain ODP. A legacy .ppt file is rejected. Themes, animations, and embedded video are not copied. If the slides themselves are the deliverable, export from PowerPoint or LibreOffice. This download is the text of the deck, laid out simply. The file stays in your browser and is not uploaded. The limit is 100 MB. Keep the original until the download has been opened in the program that will use it. Do the test with a short or simple file first when the real file is large. A one-page PDF, a single photo, or a one-minute clip will show you whether the output is the kind of file you needed. After that test looks right, run the real file once. Keep both the PPTX original and the ODP download until the receiving person or the upload form accepts it. Slides are a design. PPT to ODP can take the words off them or move a file a browser understands. It does not copy animations, masters, or embedded video. When the deck itself is what you will present, export from PowerPoint or LibreOffice. Use this page for a handout or a format a browser can actually write.
Here is the decision for PPT to ODP. You start with PPTX and you stop when a real program accepts ODP. Slide text can be pulled out for a handout or a transcript. The visual design is not copied. A legacy PPT file is not accepted as the upload. If those two sentences describe a tradeoff you do not want, do not convert. Renaming the extension by hand will not do this job. Running the tool twice on its own output will not do it either.
If the slides themselves are the deliverable, export from PowerPoint or LibreOffice. This download is the text of the deck, laid out simply.
A related step, if you still need one, is ODP to PPT.
Other jobs start from the homepage, where each tool is named for the conversion it actually does.