Convert PPT to PPTX online

To convert PPT to PPTX, upload the PPT file, start the conversion and download the result. LibreOffice opens the PPT and saves it as PPTX; styles and tables carry over where PPTX supports them.

◈ Encrypted transfer◷ Short retention⊘ No watermark◎ Works on every device

PPT to PPTX at a glance

Converts: PPT presentation format → Microsoft PowerPoint presentation
Engine: LibreOffice
Privacy: Private download link; files are deleted after 6 hours. No account needed.

PPT to PPTX: The presentation object-model rebuilding route explained

Slides, masters, text, artwork, charts, notes, and media relationships are interpreted from PPT and rebuilt with the features available in PPTX. Playback behavior and editability require separate checks from visual similarity. PPT enters through a legacy compound-binary presentation parser that resolves slide records, masters, drawing objects, notes, transitions, and embedded media. PPTX delivery rebuilds OOXML slides, layouts, masters, notes, timing, charts, and media links while remaining dependent on installed fonts and presentation-engine behavior.

Read structure - The legacy binary PowerPoint presentation model. Rebuilt structure - An OOXML slide package with editable layouts, shapes, notes, charts, and media.

Starting from another format? Check which other files convert to PPTX.

Background reading: the field guide to file formats covers why a format is a set of tradeoffs rather than a label.

PPT

PPT presentation format

Used for sequenced visual slides with accompanying speaker notes.

Family: Documents
MIME: application/vnd.ms-powerpoint

→

PPTX

Microsoft PowerPoint presentation

Designed for editable slide decks.

Family: Documents
MIME: application/vnd.openxmlformats-officedocument.presentationml.presentation

Acceptance evidence for the converted PPTX

Record the PPT evidence before conversion

Run the slide show and inspect master layouts, transitions, notes, charts, and embedded media.

Test the PPTX file in its receiving workflow

Present the deck in the destination app and check masters, notes, animations, media, and aspect ratio.

What the PPT source carries and the PPTX output demands

What can fail when PPT presentation format is interpreted

Animations, media, SmartArt, fonts, and newer effects may be flattened or repositioned.

What Microsoft PowerPoint presentation cannot safely promise

Missing fonts, linked media, transitions, and application-specific effects can change on another presentation suite.

How the PPTX writer handles this route

The writer builds an OOXML slide package with editable layouts, shapes, notes, charts, and media and labels the result as application/vnd.openxmlformats-officedocument.presentationml.presentation. The receiving application - Not the extension alone - Is the final compatibility test.

Deciding when PPT to PPTX is the right conversion

PPTX earns its place when its editing, reflow, or reader support outweighs exact PPT structure - Just test the most complex page or chapter before committing to it.

What changes between the PPT model and the PPTX deliverable

LibreOffice opens the PPT and saves it as PPTX; styles and tables carry over where PPTX supports them.
Treat PPT-specific metadata fields as optional in the PPTX result until you have actually confirmed they survived.