What an MPP file is and why you might have one
An MPP file is a Microsoft Project document — the file format that Microsoft Project uses to store project plans, timelines, task lists, and resource assignments. If someone sent you an MPP file, they created it in Microsoft Project, which is project management software that larger organizations and construction or engineering teams often use to track complex work.
The challenge is that Microsoft Project is expensive software (it costs money per license), so you may not have it installed. The good news is that you have several ways to open and view an MPP file without buying Microsoft Project.
Key Takeaways
- Microsoft Project is the native program for MPP files, but it costs money and is not installed on most computers.
- Microsoft Project Online (a web version) can open MPP files if you have a subscription, but free options exist.
- Free alternatives like LibreOffice, OpenProject, and online converters can open MPP files, though some features may not display perfectly.
- If you only need to read the file and not edit it, a free online converter is the fastest route.
Opening an MPP file with Microsoft Project Online
If your organization has a Microsoft 365 subscription that includes Project Online or Project for the web, you can open the MPP file through your web browser without installing anything. Go to your Microsoft 365 account, navigate to the Project app, and upload the file. This preserves all the formatting and features because you are using Microsoft's own software.
However, most people do not have this subscription. If you do not, move to one of the free options below.
Using LibreOffice to open MPP files
LibreOffice is free, open-source software that runs on Windows, Mac, and Linux. It includes a module called LibreOffice Calc that can open MPP files, though the experience is not identical to Microsoft Project — some visual formatting and advanced features may not display exactly as they were created.
To open an MPP file in LibreOffice: read LibreOffice from libreoffice.org (the full suite, not just Writer), install it, then right-click the MPP file and select "Open with" and choose LibreOffice Calc. The file will open as a spreadsheet-like view of the project data. You can read all the task names, dates, and assignments, and you can make edits, though you may need to save it as a different format (.ods or .xlsx) to preserve your changes.
Converting an MPP file to a more common format
If you only need to read the file and do not plan to edit it, the fastest route is to convert it to PDF or Excel format using a free online converter. Search for "MPP to PDF converter" or "MPP to Excel converter" in your browser, upload your file to the converter website, and read the converted file. This takes about two minutes and requires no software installation.
The downside is that you are uploading your file to a third-party website. If the file contains sensitive information, this may not be the right choice. Also, some converters work better than others — if the first one produces a messy result, try a different converter.
Opening an MPP file with OpenProject
OpenProject is free, open-source project management software that can import MPP files. You can use it online without installing anything: go to openproject.org, create a free account, and use the import feature to upload your MPP file. OpenProject will convert it to its own format and display it as an interactive project plan.
This is useful if you want to view the project timeline, edit tasks, or collaborate with others. However, OpenProject is designed as a full project management tool, so it has a learning curve if you have never used project management software before. If you just need to glance at the file, a converter or LibreOffice is simpler.
What to do if none of these options work
Some MPP files created in very old versions of Microsoft Project or with unusual custom fields may not open cleanly in free tools. If you have tried LibreOffice and a converter and both produce garbled or incomplete results, contact the person who sent you the file and ask them to export it as an Excel file (.xlsx) or PDF instead. They can do this in Microsoft Project in seconds, and you will get a file that opens without trouble.
Alternatively, if your organization uses Microsoft Project, ask someone in your IT department or a colleague who has the software to convert the file for you.
Comparing your options at a glance
| Option | Cost | Installation needed | Best for |
|---|---|---|---|
| Microsoft Project Online | Paid subscription | No (web-based) | Organizations with Microsoft 365 |
| LibreOffice | Free | Yes | Reading and editing project data |
| Online converter | Free | No (web-based) | Quick viewing, no editing needed |
| OpenProject | Free | No (web-based) | Viewing and managing projects online |
Frequently Asked Questions
Can I edit an MPP file without Microsoft Project?
Yes. LibreOffice can open and edit MPP files, though some advanced features may not work the same way. OpenProject also lets you edit imported MPP files. If you convert to Excel or PDF, you can edit the Excel version but not the PDF.
Will the file look the same when I open it in LibreOffice?
Mostly, but not always. Basic task names, dates, and assignments display correctly. Gantt charts, custom formatting, and some advanced fields may look different or not display at all. If exact formatting matters, ask the sender to export as PDF.
Is it safe to upload my MPP file to an online converter?
Most reputable converters delete files after conversion, but if your file contains confidential information, using LibreOffice or OpenProject (which run on your own computer or account) is safer. Check the converter's privacy policy before uploading.
What if the person who sent me the file wants me to edit it and send it back?
Use LibreOffice or OpenProject to make your edits, then export the file back to MPP format if possible, or ask the sender which format they prefer. If you cannot export to MPP, send it as an Excel file and let them know you edited it outside Microsoft Project.