How to Open a .pub File on Windows 11 (and Windows 10)

Windows 11 and Windows 10 don't include anything that reads .pub files. To open one, install an app that does, such as Korva for Windows, LibreOffice Draw or Microsoft Publisher if you still have it. Then set that app as the default under Open with. For a quick look without installing anything, use a free browser viewer that reads the file locally.

If someone emailed you a .pub file and Windows only shows a blank icon, or asks which app you want to use, nothing is wrong with the file. A .pub is Microsoft Publisher’s own document format. Windows can store it and show the extension, but it can’t display the layout without an app that understands Publisher files.

This guide is Windows-specific: which apps work on a Windows PC, how to install them, how to make .pub files open with the right one, and what to do when a Publisher file won’t open. For every device and option, including phones and Chromebooks, start with our main guide on how to open a .pub file.

What app opens .pub files on Windows?

These are the options that actually read a Publisher file on a Windows PC:

The apps that come with Windows don’t help here. Word, Photos, Paint, Notepad and Edge on its own can’t read the Publisher format. Edge can show a PDF after the file has been converted, but it can’t open the raw .pub.

Why Windows shows a blank icon or asks which app to use

Every file extension on Windows is linked to a default app. .docx goes to Word and .pdf goes to your browser or PDF reader. When Publisher is installed, it claims .pub. When it isn’t, nothing does, so Windows either shows a generic icon or asks which app to use.

Publisher was never a guaranteed part of Windows or Office. It was sold separately or included only in certain Microsoft 365 and Office plans, so plenty of PCs never had it. And since October 1, 2026, Publisher is no longer part of Microsoft 365 at all. On a new PC, or one that’s been reset, there’s no way to get it back through a Microsoft 365 subscription. That’s why more people are running into .pub files that suddenly won’t open.

Option 1: Install Korva for Windows

Korva is a desktop app for Windows, macOS and Linux, built for people moving off Publisher. It opens and edits any .pub without an account or an upload. It opens the layout, with text boxes, pictures and shapes where Publisher placed them and the formatting carried across, accented characters included, then exports a PDF. A new user can export their first complete project as often as needed.

Which Windows installer to choose

The download page offers two Windows files:

• .exe: the normal installer. Double-click it and follow the steps. This is the one almost everyone should use.
• .msi: a Windows Installer package for IT teams that need silent or group-policy installs.

Korva needs Windows 10 or later. It installs like any other desktop app, and after that it runs fully offline.

Install and open your .pub file

1. Download the Windows installer. Get the .exe installer from the Korva download page. Korva needs Windows 10 or later.
2. Run it and get past SmartScreen. If Windows shows “Windows protected your PC”, click More info, then Run anyway. Follow the installer, and Korva opens when it’s done.
3. Open the .pub file. Choose Open a .pub file on Korva’s home screen, or drag the file onto the window.
4. Check the imported page. Korva opens the pages at their original size, with text boxes, pictures and shapes where Publisher placed them. The Import Health panel says what was kept and what to check.
5. Export a PDF. Export a PDF that Windows, browsers, email and printers can all open. A new user can export their first complete project as often as needed.

About the SmartScreen warning

Korva is independently built and isn’t yet signed with a paid Microsoft developer certificate. So the first time you run the installer, Microsoft Defender SmartScreen may show a blue “Windows protected your PC” screen. It isn’t a sign of a problem. Click More info, then Run anyway, and the installer continues as normal. You only see it once.

If you’d like to double-check the file first, the download page lists a SHA-256 checksum for every installer. Open PowerShell, run certutil -hashfile followed by the path to the installer and SHA256, and compare the result with the checksum on the page. If they match, the file arrived intact and untampered.

On a work PC, your organization may block installers that aren’t signed with a paid certificate. In that case, ask IT to deploy the .msi package for you.

What to expect from the import

Korva opens the pages at their original size, with text boxes, pictures and shapes where Publisher placed them and linked text boxes flowing as they did in Publisher. Fonts, sizes, colours, lists, tables and text wrap come across too. It’s close, not a pixel-perfect clone, since no tool outside Publisher reproduces every .pub exactly. Fonts that aren’t installed on your PC are replaced, so check that text still fits before printing, and very complex designs may need a quick touch-up. If a damaged or unusual file’s layout can’t be read, Korva falls back to rescuing its text and pictures onto editable pages. Korva opens the file as an editable copy, so the original .pub on your drive is left untouched.

Because Korva runs locally, sensitive files stay on your PC. That matters for member lists, school notices, internal flyers and anything with addresses or private details.

Make .pub files open with the right app (“Open with”)

Once a .pub reader is installed, you can tell Windows to use it every time you double-click a Publisher file. If the installer didn’t set this up, or Windows keeps asking, set it yourself.

On Windows 11:

1. Right-click the .pub file in File Explorer.
2. Choose Open with, then Choose another app.
3. Select Korva (or LibreOffice Draw) from the list. If it isn’t listed, scroll down and choose an app on your PC, then select it.
4. Click Always so every .pub opens this way.

On Windows 10:

1. Right-click the .pub file and choose Open with, then Choose another app.
2. Select the app, and tick Always use this app to open .pub files.
3. Click OK.

You can also change it from Settings. In Windows 11, go to Settings > Apps > Default apps and type .pub into the file type search box. In Windows 10, go to Settings > Apps > Default apps and choose Choose default apps by file type. If Publisher is still installed and you’d rather keep using it, this is also where you switch .pub back to Publisher.

If you’d rather not change anything, you don’t have to. Open Korva first and open the file from inside the app. That always works.

Option 2: Publisher, if it’s still on your PC

If Publisher is installed and still opens, it remains the most faithful way to view a .pub, because it created the format. Open the file, check that the fonts and images still look right, and export a PDF of anything important while you can.

What changed when Publisher left Microsoft 365

Since October 1, 2026, Publisher is no longer included in Microsoft 365. Microsoft doesn’t offer it as a download through your Microsoft account anymore, and it gets no further updates, security patches or support. In practice, on a Windows PC, that means:

• An existing install may keep running for a while. End of life is about Microsoft’s support, not a remote kill switch. But unsupported software can break with a future Windows update, and there’s no fix coming.
• You can’t reinstall it. A new PC, a Windows reset or a failed drive means Publisher is gone for good on that machine.
• Your .pub files lose their default app. Once Publisher is uninstalled, double-clicking a .pub goes back to asking which app to use. That’s the moment to set a new default, as described above.
• Your files aren’t affected. The .pub files stay on your drive, network share or USB stick exactly as they were. What you lose is an easy way to open them.

If you’re responsible for an office, church or school archive, use any working Publisher install now to export PDFs of the files that matter. For a longer plan, see what Publisher’s end of life means and how to batch convert .pub files to PDF.

Option 3: LibreOffice Draw on Windows

LibreOffice is a free, open-source office suite for Windows, and its Draw module can import some Publisher files through the libmspub filter. It’s local, so nothing is uploaded.

To try it, download and install LibreOffice from its official site, open LibreOffice, and use Open File to choose the .pub. It opens in Draw. You can also right-click the file and use Open with to pick LibreOffice Draw.

Keep your expectations realistic. Simple files may come through well. Files with lots of images, custom fonts or careful positioning often arrive shifted or incomplete. Draw can’t save back to .pub. It saves as OpenDocument Drawing or exports PDF. And LibreOffice is a full office suite, a download of a few hundred megabytes, which is a lot for one file. If you already have it, it’s a good free second opinion. We compare the two in LibreOffice Draw vs Publisher.

Option 4: Microsoft Store “pub viewer” apps

Search the Microsoft Store for “pub viewer” and you’ll find third-party apps that offer to open Publisher files. Microsoft doesn’t ship a free Publisher viewer, so none of them are official. We don’t recommend any by name here. Some may be perfectly fine, but they vary, and a Store listing tells you little about how the app handles your file.

Before you install one, check:

• Who makes it. Look for a developer website and a support contact.
• Where the file goes. Does the app read the file on your PC, or send it to a server for conversion? The listing or privacy policy should say. If it doesn’t, assume an upload.
• The price model. Watch for apps that are free to view but charge to export, or that need a subscription or in-app purchases.
• Recent reviews. Look for reviews that mention .pub files specifically.
• PDF export. A PDF is usually what you need next, so make sure the app can produce one.

If a Store app can’t answer those questions, a known local tool is the safer choice.

Option 5: Open it in your browser without uploading

If you can’t install software, for example on a locked-down work PC, a browser tool is the fallback. Korva’s free online .pub viewer runs in Edge, Chrome or another current browser. It loads a small WebAssembly engine into the page, reads the file on your PC, and shows the pages as a PDF preview. The file isn’t uploaded.

If you need a PDF file rather than a preview, the browser .pub to PDF converter works the same way and gives you a PDF to save. Both are built for files up to 40 MB and handle one file at a time. For bigger files or whole folders, use the desktop app.

Publisher file won’t open on Windows 11? Fixes to try

If a .pub still won’t open, work through these Windows-specific checks.

Windows asks “How do you want to open this file?” No app is set for .pub. Install a reader and set it as the default with Open with, as described above.

It opens in the wrong app. Change the default under Settings > Apps > Default apps, or right-click and use Open with.

You can’t see the .pub extension. File Explorer hides extensions by default, so you can’t always tell what a file really is. In Windows 11, choose View > Show > File name extensions. In Windows 10, open the View tab and tick File name extensions. Now you can check that the file really ends in .pub, and not, say, .pub.zip.

The file is inside a .zip. File Explorer shows the inside of a .zip like a normal folder, but the files in it aren’t extracted yet, and opening them from there can fail. Right-click the .zip, choose Extract All, then open the .pub from the extracted folder.

The file is in OneDrive with a cloud icon. That means it’s stored online-only. Right-click it and choose Always keep on this device, wait for the download to finish, then open it.

The file came from email or the internet. Windows may mark downloaded files as coming from another computer. Right-click the file, choose Properties, and if you see an Unblock checkbox at the bottom of the General tab, tick it and click OK. Only do this for files you trust.

The Korva installer won’t run. If SmartScreen blocks it, click More info, then Run anyway. If your organization blocks it outright, ask IT to install the .msi.

The file opens but looks wrong. A font from the original may not be installed on your PC, so a substitute is used, or a very complex design may need a touch-up. Korva’s Import Health panel lists what to check. Fix those spots and make sure the text fits before you print.

Nothing opens it. Try a second tool, because Korva and LibreOffice Draw use different importers. If both fail, the file may be damaged or incomplete, so ask the sender for a fresh copy. Also check its size. A .pub under a kilobyte that opens in Notepad as one line of text is probably an SSH public key, not a Publisher document.

What will not work on Windows

Don’t rename the file to .pdf, .docx or .jpg. That only changes the filename, not the contents. Word can’t open .pub directly either, so the Word route starts only after you’ve converted the file to PDF.

Photos, Paint and Edge won’t help with the raw .pub. They can display a PDF after conversion, but they don’t read Publisher documents.

The best path on Windows

For a current Publisher user: open your important .pub files in Publisher now and export PDFs while the app still runs.

For everyone else: install Korva if the file is private or important, set it as the default for .pub files, and open your first complete project. Try LibreOffice Draw as a free second opinion. Use the local browser viewer when you can’t install anything, and keep upload-based converters for disposable public files.

For the general how-to across every device, see how to open a .pub file without Publisher. If you’re comparing viewers, our .pub file viewer guide lines them up side by side, and the .pub to PDF conversion guide helps you decide what should become a permanent archive copy.

Microsoft Publisher, Microsoft 365 and Windows are trademarks of Microsoft Corporation. Korva is independent and not affiliated with Microsoft.