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Drop one PPSX or two hundred. Batch conversion is not a paid feature here.
Convert PPSX to PPTX
A deck arrived as a .ppsx, which opens straight into full-screen playback and gives no obvious way to edit it.
SafeConvert engineFreeNo sign-upBatch supported
Waiting for files/Engine: on-device/Network requests made: 0
What actually changes
PPSX and PPTX are not the same picture in two wrappers.
Almost nothing about the content. PPSX and PPTX hold the same data; the show format simply tells PowerPoint to start presenting on open. The conversion changes that behaviour flag.
Worth knowing first
PPSX is not a protection mechanism, though people send it as if it were. The slides were always editable; the format only changed how the file opens. Anyone can convert it, which is worth knowing before relying on it to prevent edits.
Questions
PPSX to PPTX, answered
Can I edit a PPSX without converting?
Yes, by opening it from inside PowerPoint with File, Open rather than double-clicking it.
How do I stop people editing my deck?
Send a PDF. It is the only format in this family that meaningfully resists editing.
How to convert PPSX to PPTX
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Choose your settings
PowerPoint Presentation is lossless, so nothing is thrown away in the conversion.
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Download
Converted and deleted the moment it finishes. Never written to permanent storage.