Open MPP Online | Microsoft Project Viewer in Your Browser

Zero Friction

The Smartest Way to Open Microsoft Project Files

No expensive Microsoft Project licenses, no Windows virtual machines, and no sketchy file converter websites.

Instant Zero-Install Access

Open any Microsoft Project file immediately on macOS, Windows, Linux, Chromebook, or iPad. Works out of the box in Google Chrome, Microsoft Edge, Safari, and Firefox.

Strict Local Data Privacy

Traditional online converters upload your confidential project files to remote servers. With XER Reader, all schedule processing runs strictly in your local device memory.

Interactive Schedule Analysis

Not just a static picture. Navigate interactive Gantt charts, expand and collapse WBS hierarchies, trace critical path links, inspect resource allocations, and view S-curves.

Universal Compatibility

All Major Microsoft Project Formats Supported

Seamlessly open schedules exported from any version of Microsoft Project or Primavera P6.

.MPP

Microsoft Project

Native binary schedule files from Microsoft Project 2000 through 2021 and Microsoft 365.

.XML

MSPDI & P6 XML

Standard XML schedule interchange files from both Microsoft Project and Oracle Primavera P6.

.MPX

Legacy Project Exchange

Text-based project interchange files used for backwards compatibility across older planning systems.

.XER

Primavera P6

Native Oracle Primavera P6 project files, allowing dual inspection of both P6 and MSP in one tool.

Inspection Power

Professional Features in Your Web Browser

Experience desktop-grade schedule inspection tools directly in your browser window.

Gantt Chart

Interactive Timeline & Driving Logic

Navigate project schedules with an interactive Gantt chart. Zoom between shifts, days, weeks, months, and years. Inspect predecessors, successors, driving relationships, and critical path dependencies instantly.

Full relationship logic: Finish-to-Start, Start-to-Start, Finish-to-Finish, Start-to-Finish
Critical path highlights with total float and free float calculations
Progress fills, baseline comparison bars, and milestone boundary markers

Resources & Curves

Resource Analysis & S-Curves

Analyze resource workloads and financial expenditure without opening complex database tools. Switch seamlessly between Activity Gantt, Resource Assignment, and S-Curve views.

Resource Assignment views grouped by resource role, trade, or discipline
Interactive S-Curves showing cumulative planned vs actual progress
Calendar inspection for standard, 24-hour, and custom work week shifts

Comparison

How XER Reader Compares for Online MPP Viewing

See why project teams choose private in-browser schedule viewing over cloud file uploaders.

Feature / Capability	XER Reader Web Viewer	Microsoft Project Desktop	Generic Online Converters
Access & Setup	Instant in browser, zero install	Heavy install, Windows only	Upload file to third-party server
Data Confidentiality	100% private client-side memory	Local desktop file	Schedule stored on external cloud
Mac & Linux Compatibility	Full native browser support	Requires Windows VM or Parallels	Browser-based
Dual Format (MPP & XER)	Yes, opens both MPP and XER	MPP and MSPDI XML only	Usually single-format only
Interactive Gantt & Filtering	Yes, full zoom, filters, and logic	Yes, full authoring tools	Static image or stripped preview
Cost & Licensing	Free trial, affordable plans	Expensive authoring license	Ad-heavy or paid per file

Quick Guide

How to Open Your MPP File Online in 3 Steps

Open, inspect, and analyze your Microsoft Project schedules without installing extra software or purchasing expensive licenses.

01

Launch the Viewer

Navigate to app.xerreader.com in any modern browser on Mac, Windows, Linux, or iPad.

02

Drag and Drop

Drag your .mpp, .mpx, or XML schedule file directly onto the browser window. Parsing begins locally in memory immediately.

03

Inspect & Analyze

Explore the interactive Gantt chart, filter tasks, check critical paths, view resource histograms, and export reports.

Frequently Asked Questions

Common Questions About Opening MPP Files Online

Everything you need to know about browser-based Microsoft Project schedule viewing.

Can I open Microsoft Project (.mpp) files on a Mac or Chromebook?

Yes. Because XER Reader runs directly in your web browser via WebAssembly, you can open, inspect, and filter Microsoft Project (.mpp, .mpx, XML) files on macOS, ChromeOS, Linux, and Windows without installing Windows virtual machines or purchasing Microsoft Project licenses. If you prefer a desktop Mac application, we also provide a native macOS installer optimized for Apple Silicon and Intel Macs.

Do my Microsoft Project files get uploaded to your servers?

No. When you open an MPP file in XER Reader Web Viewer, the schedule is parsed locally inside your browser memory. Your schedule data never travels across the internet or touches our servers unless you deliberately choose to publish a shareable link using XER Reader Cloud.

Which versions of Microsoft Project are supported?

XER Reader supports files created in Microsoft Project 2000, 2002, 2003, 2007, 2010, 2013, 2016, 2019, 2021, and Microsoft 365. It also opens MSPDI XML and legacy MPX interchange files.

Can I also open Oracle Primavera P6 (.xer) files in the same web viewer?

Yes. XER Reader is a unified schedule engine. You can open and inspect Oracle Primavera P6 (.xer and P6 XML) files as well as Microsoft Project (.mpp, .mpx, MSPDI XML) files within the exact same viewer interface.

Can I print or export schedules from the online viewer?

Yes. You can generate infinite-resolution vector PDF printouts of the Gantt chart and export schedule data to standard formats including CSV and Excel spreadsheets directly from the browser viewer.

Ready to Get Started?

Start Viewing Microsoft Project Schedules Right Now

Open the web viewer directly in your browser. Drag and drop your .mpp file for secure, completely confidential schedule viewing.

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Open and View Microsoft Project (.MPP) Files Online