Free online PPT to PPTX converter

Older presentations are often stored as .ppt files, while current PowerPoint versions and office suites use .pptx for editing and sharing. Converting the file can remove compatibility warnings and usually reduces its size, but the original should be retained until the converted slides are checked.

What the PPT format is

PPT is Microsoft PowerPoint's proprietary binary presentation format, primarily used by PowerPoint 97–2003 and older presentation software. It can contain slides, text, images, charts, animations, speaker notes, hyperlinks, embedded objects, and formatting. Files may also contain VBA macros, ActiveX controls, OLE objects, or links to external media.

What the PPTX format is

PPTX is the default presentation format introduced with Microsoft Office 2007. It uses Office Open XML: a ZIP package containing XML document parts, media, relationships, and other resources rather than one proprietary binary stream. PPTX usually produces smaller files, supports newer PowerPoint features, and is handled by current versions of PowerPoint, LibreOffice Impress, and other office software.

A file saved as PPTX is not automatically modernized. The conversion changes its storage format, while unsupported or obsolete slide features may still need manual replacement.

How to convert the file in PowerPoint

1. Open the .ppt file in Microsoft PowerPoint 2007 or later.
2. Select File → Save As or, in some current versions, File → Save a Copy.
3. Choose a destination and select PowerPoint Presentation (*.pptx) as the file type.
4. Use a new filename if the original PPT must be preserved, then select Save.
5. If PowerPoint displays a compatibility warning, review the affected features and confirm the save.

PowerPoint does not include a general-purpose batch converter in its standard interface. A VBA macro or Microsoft Office automation script can open each source file and save it with the ppSaveAsOpenXMLPresentation format constant. Run automation on copies and test the results because macros, embedded objects, linked files, and unsupported effects may require separate handling.

How to convert the file in LibreOffice

1. Open the PPT file in LibreOffice Impress.
2. Select File → Save As.
3. Choose a PowerPoint 2007–365 or equivalent .pptx file type.
4. Confirm the format choice and save to a new filename or directory.

For unattended conversion, LibreOffice supports a command such as soffice --headless --convert-to pptx --outdir output presentation.ppt. Use a separate output directory so the source is not overwritten, and review the result visually.

How to convert without desktop software

You can convert the file for free on 101convert.com without installing software: upload the PPT file, choose PPTX when the format selector is shown, start the conversion, and download the result. Do not upload confidential, personal, or regulated presentations unless the service's storage, processing, and deletion terms satisfy your requirements.

Quality and compatibility checks

Open the converted file in the PowerPoint version or office suite used for delivery. Check every slide in normal and presentation views, including fonts, line wrapping, slide masters, charts, SmartArt, transitions, animations, audio, video, hyperlinks, speaker notes, and embedded objects.

PowerPoint may substitute missing fonts, alter spacing, or change unsupported charts, effects, and animations. Linked media and other external files can stop working when the presentation is moved; package or relink those files before distribution.

PPTX does not preserve VBA project code. If the source contains macros, save it as .pptm instead and enable macros only when the file is trusted. ActiveX controls, OLE objects, and other legacy components may become static content or lose editability. Password-protected files require their password, and a conversion cannot recover content that the source application cannot open.