Bring your .pptx files, and take them back
Import the decks you already have, work on them in the browser, and export to editable PowerPoint whenever you want. Nothing gets locked in.
Switching tools usually means abandoning your back catalogue
Years of decks live in .pptx files. A tool that cannot open them asks you to start over, and a tool that cannot export back to them asks you to trust it forever. Neither is a reasonable thing to ask.
What you get
- Import existing .pptx files and keep editing them
- Export back to .pptx — editable in PowerPoint, Keynote or Google Slides
- No install: the editor runs in your browser, on any operating system
- A desktop app for Windows and macOS when you want to work offline
- The same deck also exports to PDF, video and SCORM
What survives a round trip
| Import .pptx → Mosra | Export Mosra → .pptx | |
|---|---|---|
| Text, fonts and colours | Yes | Yes |
| Images and media | Yes | Yes |
| Shapes | Yes | Native where PowerPoint has an equivalent |
| Tables and charts | Yes | Yes |
| Editable after the fact | Yes | Yes, in PowerPoint |
| Slide-level animations | Partly | Partly |
| Graded questions | n/a — PowerPoint has none | No; they need SCORM, xAPI or the share link |
How it works
Import your deck
Upload a .pptx and it opens as an editable presentation.
Work on it
Drag-and-drop editing, animations, charts, collaboration.
Take it anywhere
Back to .pptx, or on to PDF, video or an LMS package.
What this does not do
- It is not a pixel-perfect round trip. PowerPoint and a browser lay text out with different engines, so a slide packed to its margins can reflow by a line.
- About seven in ten shape types export as native PowerPoint shapes you can still edit; the rest are exported as an image of the shape, which looks right but is no longer editable.
- Macros, add-ins and embedded OLE objects are not imported. Neither is anything that depends on PowerPoint itself being installed.
- Graded questions do not survive the trip to .pptx, because the format has nowhere to put them. Use SCORM, xAPI or a share link for those.
Questions
Is Mosra a PowerPoint replacement?
For building and sharing decks, it does the job in a browser with no install, and it exports to formats PowerPoint has no answer for — SCORM, xAPI and cmi5. But it is not a clone, and a deck built around PowerPoint-specific features will not transfer perfectly. Import one and see how yours fares.
Will my imported deck look exactly the same?
Close, not identical. Fonts you have not uploaded get substituted, and unusual PowerPoint-only effects may not have an equivalent. Simple decks transfer cleanly; heavily styled ones are worth checking slide by slide.
Can I get my work back out if I stop using Mosra?
Yes, and that is deliberate. Export to editable .pptx at any time. We would rather earn the next month than trap you into it.
Related features
A PDF that is actually a PDF
Not a stack of screenshots with a .pdf extension. Real vector text and shapes, your fonts embedded, sharp at any zoom.
CollaborationOne deck, several people, no attachments
Edit together in real time and watch each other's changes land. No final_v3_REALFINAL.pptx.
e-Learning exportTurn a presentation into a SCORM package
Design the deck once, export the package your LMS already knows how to read. No rebuilding the same lesson in a separate authoring tool.
All features →SCORM vs xAPI →PowerPoint to SCORM →iSpring alternative →
Import a deck and judge for yourself
Free while we build in the open. Bring your most awkward .pptx — that is the honest test.