Hi all, hope your day is going well.
I need PowerPoint add-in to make presentations uneditable, that no one can make any changes to it, or save it in other format.

Hey Hani....am using 2016. No separate add-in is required. In file tab we have option to mark the "Presentation as final" and it will become read only automatically. No one can make any changes on that. Please try it

Not so. All anyone has to do is turn off "Mark as Final" and it may as well not be there.

Adding a modify password gives some protection but it is easy to break.

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Microsoft PowerPoint MVP 2007-2023
Free Advanced PowerPoint Tips and Tutorials

Thanks virtualasset for your reply , but as JohnWilson said: "All anyone has to do is turn off "Mark as Final".
Yes.. It's that easy!
And also: "Adding a modify password gives some protection but it is easy to break".
Yes I know that to.
The amazing thing is I searched for a days (up and down left and right) but i didn't find any thing even paid!!
OK.. I'll search again maybe...

There are a couple of paid options but I haven't tried any of them Shyam's Secure Pack (not cheap) and various PPT to exe converters.

__________________
Microsoft PowerPoint MVP 2007-2023
Free Advanced PowerPoint Tips and Tutorials

Thank you John, I'll check that.