PPT to PPTX
Convert legacy .ppt to modern .pptx.
Click to upload or drag & drop
Select a legacy PowerPoint file (.ppt)
How to use the PPT to PPTX
- 1Add the old .ppt
Select the legacy PowerPoint file from your disk, or drop it onto the box above.
- 2Rebuild it as .pptx
Choose Convert to PPTX. LibreOffice parses the binary record stream and writes a fresh Office Open XML package.
- 3Take the modern file
Your .pptx is delivered to the browser the moment the rebuild finishes.
Examples
| Input | Output |
|---|---|
deck.ppt (binary OLE) | deck.pptx (ZIP of XML) |
VBA macro project | Removed; .pptx holds no code |
PowerPoint 97 WordArt | Redrawn with modern effects |
Legacy OLE embed | Static image |
Slide order and notes | Unchanged |
Bringing a .ppt deck into the present
PowerPoint 97 through 2003 saved to .ppt, a binary OLE compound file: a miniature file system of streams and records, laid out so the software of the day could read it straight into memory. PowerPoint 2007 changed the ground rules by adopting .pptx, which is nothing more exotic than a ZIP archive holding XML documents, your images and a manifest tying them together. This page reads the first and writes the second using LibreOffice, leaving you with a deck that current PowerPoint, Keynote, Google Slides and every phone viewer treat as a first-class citizen.
Why the newer container is worth the trip
- It weighs less.XML compresses extremely well and the ZIP wrapper squeezes it, so a converted deck is frequently far lighter than the binary it came from — handy when a mail server keeps bouncing the attachment.
- It can be inspected and salvaged. Because the package is a ZIP of readable parts, a damaged .pptx can often be opened and a single bad part replaced or removed. A corrupt binary .ppt is far more likely to be simply unreadable.
- It is not blocked.Organisations routinely restrict the old binary Office formats through Trust Center file-block policy, which is why a colleague may find the deck opens read-only, opens in Protected View, or refuses to open at all.
- It is supported everywhere. Plenty of modern apps, web previewers and mobile viewers read .pptx and quietly ignore anything older.
What the upgrade cannot carry
A .ppt can hold a VBA macro project; a plain .pptx deliberately cannot, since macro-enabled decks belong in .pptm. Anything scripted in the original is therefore absent from the result, and if those macros matter you will have to rebuild them inside PowerPoint. Old embedded OLE objects have a related problem: an equation, org chart or spreadsheet planted there by a program from 1999 generally comes through as a static picture, because the application that owned it is not around to render it. Pre-2007 WordArt and the old bevelled effects are redrawn with modern equivalents that rarely match to the pixel, and any typeface the deck expects but the converting machine lacks is substituted, which explains most headings that suddenly wrap.
What to do with the .pptx afterwards
Once the deck sits in the modern format the rest of the toolkit opens up to it. To hand it over as a fixed document that cannot reflow on anyone else's screen, run PPTX to PDF. To carry on editing in LibreOffice Impress rather than PowerPoint, PPTX to ODP moves it to the open standard. Either way, keep the original .ppt somewhere safe: this is a one-way trip, and the binary file remains the only copy of whatever did not make the journey.
Where the conversion happens
Decoding the 97–2003 record format is genuinely hard — it is a documented binary layout, not text — and the code that does it dependably ships as part of a desktop office suite. No JavaScript in a browser tab stands in for that, so your upload goes to a machine of ours running LibreOffice with no interface attached. It travels over TLS, is converted inside a throwaway folder, and both the .ppt and the .pptx are removed the moment the response has been sent.
Frequently Asked Questions
Will the .pptx be smaller than the .ppt?
Usually, and sometimes by a wide margin. The old format wrote a great deal of structure out verbatim, whereas the new one is compressed XML inside a ZIP. Decks made mostly of text and shapes shrink the most; one built from large photographs barely moves, because those images are already compressed and are simply copied across.
What happens to macros in the old deck?
They do not survive. The .pptx format has nowhere to keep a VBA project — Microsoft split macro-enabled decks off into .pptm precisely so a plain .pptx can be trusted not to run code. If the original depended on macros, open it in PowerPoint on a machine that still reads .ppt and save it as .pptm yourself.
My deck opens in Protected View or IT blocks it. Does this help?
Often it does. Those restrictions target the legacy binary Office formats, which were a favourite malware carrier, so the same content packaged as .pptx normally opens without the warning. Worth saying plainly, though: this is an administrator's policy, and if your organisation restricts presentations generally, a new container will not change their mind.
Do the slides still look the way they did?
Layout, ordering, pictures, tables and notes come through faithfully. Differences show up in the decoration — ancient WordArt, old shadow and bevel styles, clip art embedded by long-gone applications — which gets redrawn using what today's format provides. Skim the deck once and expect a cosmetic tweak or two, not a rebuild.
Can I turn the .pptx back into a .ppt here?
No, there is no reverse tool on the site, because almost nothing still demands the old format. PowerPoint itself can save back to PowerPoint 97-2003 from its Save As dialog if you truly need it, but simply keeping your original file is easier.
Any cost, limit or watermark?
It is free to use without registering, and your slides come back untouched — nothing is added to them. Each upload may be up to 100 MB, far beyond what .ppt decks of that era ever reached in practice.