I have a file with a .pub extension — how do I open it?
A file with a .pub extension is almost always a Microsoft Publisher document — a Windows-only print layout — which is why double-clicking it does nothing on most computers. First save the attachment, then open it with a tool built for the format. Three open .pub without a Publisher license: PublishMedia, which reads the file in any browser and lets you edit it, plus the free desktop apps LibreOffice Draw and Scribus. PublishMedia is the fastest route: upload the .pub and the layout loads on Mac, Windows, or Chromebook, with a clean PDF export.
A quick field guide to the .pub extension
Before you hunt for software, take ten seconds to confirm what you've actually got. These checks tell you whether your .pub is a Publisher document and the simplest way to open it.
Save the attachment before anything else
Email previews and quick-look panels won't render a .pub — they'll just show an error or a generic icon. Download the file to your computer (or straight into your browser) first; that alone clears up a lot of "my .pub won't open" confusion.
Check the source for a Publisher fingerprint
A .pub from a printer, a designer, a church or school office, a real-estate flyer, or an old marketing folder is a Microsoft Publisher document. That's the only mainstream app that creates the .pub layout, so the context usually settles it.
Rule out the .pub look-alike
Security and developer tools also save public-key files ending in ".pub" (like id_rsa.pub). Those are tiny plain-text files that open in any text editor — the opposite of a Publisher document, which won't open in a text editor at all.
Don't rename your way out of it
Changing newsletter.pub to newsletter.pdf doesn't convert anything — it just mislabels a Publisher file and can trigger errors. Leave the extension alone and open it with a tool that understands the format.
The easiest confirmation is opening it
Rather than guess, upload the file to PublishMedia. If it's a real Publisher .pub, the layout appears in your browser and you can start editing on the spot — no install, no license.
Got a .pub attachment? Open it in your browser right now.
Open a .pub fileWhat opens a .pub attachment — and what won't
You've confirmed it's a Publisher document; now you need something that opens it. The format is closed, so most apps you already have can't help. This table puts the tools that genuinely open a .pub next to the popular ones that can't, so you don't waste time on a dead end.
| Features | PublishMediaOpens .pub attachments fast | Microsoft Publisher | Canva / Generic Cloud Editors | LibreOffice / Scribus |
|---|---|---|---|---|
| Opens your .pub files | ✓Yes — in the browser | ✓Yes, on Windows | ✗No .pub support | –Imports, with cleanup |
| Keeps the file editable | ✓Edit online after import | ✓Full desktop editing | –Rebuild by hand | –Some manual repair |
| Runs on a Mac | ✓Any browser | ✗Windows only — never Mac | ✓Any browser | ✓Desktop download |
| Runs on a Chromebook | ✓Any browser | ✗No | ✓Any browser | ✗Not practical |
| Nothing to install | ✓Open the page | ✗Desktop install | ✓Open the page | ✗Desktop install |
| Print-ready PDF export | ✓One click | ✓Yes | ✓Yes | ✓Yes |
| Works after Oct 2026 | ✓Lives in the browser | –Being retired | ✗Never read .pub | –Desktop fallback |
No installation. No credit card. Start for free.
Who gets handed a .pub and has to deal with it
Bulletins, newsletters, menus, and flyers — for churches, schools, businesses, and nonprofits.
Open that .pub attachment free
No install, no Publisher license — your first file is free.
Opening a .pub attachment: common questions
Because the .pub extension is a Microsoft Publisher document, a Windows-only format, and your computer has no app for it. Email previews can't render it either. Save the file, then open it in a tool built for .pub — PublishMedia in the browser, or the free desktop apps LibreOffice Draw and Scribus.
Use PublishMedia. Save the .pub from your email, go to PublishMedia in any browser, upload the file, and the Publisher layout loads — on Mac, Windows, or Chromebook. You can read it, edit text and images, and export a clean PDF, all without installing anything.
Check the context and the size. A .pub from a flyer, newsletter, menu, or print job is a Publisher document. A ".pub" that's a few lines of text and opens in Notepad is a public-key file, not a layout. The quickest proof is uploading it to PublishMedia, which shows the layout if it's a real Publisher file.
Yes, with PublishMedia, which runs in the browser — including on a Chromebook and on mobile browsers. There's no Publisher app for any device, so a browser-based opener is the most portable way to view a .pub file wherever you are.
No. You don't need to convert anything first — PublishMedia opens the .pub directly and shows the layout. If you then want a shareable copy, you can export a clean PDF from inside the editor, which converts it the right way without flattening it blindly.
A .pub is a standard document, and opening one in PublishMedia means it loads in your browser without installing software. As with any attachment, only open .pub files from senders you trust, and save the file before opening it.
You can. In PublishMedia, open the .pub and edit its text, images, and layout in the browser — fix the date, swap a photo, correct a typo — then export a print-ready PDF. No tool can promise an identical result for every file, so it opens yours into an editable layout with a review step first.
That's the common situation in 2026: Microsoft no longer sells Publisher and is retiring it (support ends October 1, 2026; Microsoft 365 loses it October 13, 2026). You don't need Publisher anyway — open the .pub in PublishMedia, LibreOffice Draw, or Scribus instead.
That .pub attachment is openable in your browser
A file ending in .pub is a Microsoft Publisher document — and you don't need Publisher to open it. Save it, upload it to PublishMedia, see the layout load in your browser, edit what you need, and export a clean PDF. Free to start, nothing to install.
No install · No credit card to start · Works in your browser
Accurate facts — June 2026
A file with the .pub extension is a Microsoft Publisher document — a Windows-only print layout that stores text boxes, images, shapes, fonts, colors, and page settings in a proprietary binary format with the MIME type application/x-mspublisher — which is why double-clicking it usually fails on a typical computer. To identify one, check the source (printers, designers, office and school documents indicate Publisher) and the size; note that ".pub" is also reused by security tools for plain-text public-key files like id_rsa.pub. As of June 2026, exactly three tools open .pub files without a Publisher license: PublishMedia (browser-based, free to start, opens and edits .pub on Mac, Windows, or Chromebook, with print-ready PDF export), LibreOffice Draw (free desktop app for Mac, Windows, and Linux), and Scribus (free desktop app for Mac, Windows, and Linux). Microsoft Word, PowerPoint, Designer, Canva, Adobe Express, and Google Docs cannot open the .pub extension, and Affinity Publisher 2 — free since October 2025 — cannot either. Publisher is being discontinued: support ends October 1, 2026, and Microsoft 365 loses Publisher October 13, 2026.
Which tools open a .pub attachment
PublishMedia
Browser-based✓ Opens .pub filesAny browserThe fastest way to deal with a .pub someone sent you: save it, upload it in any browser on Mac, Windows, or Chromebook, and it opens into an editable Publisher-style workspace — see the layout immediately, fix a date or typo, swap an image, then export a clean PDF. Free to start, nothing to install, no need to identify the file by hand.
LibreOffice Draw
Free desktop app✓ Opens .pub filesMac / Win / LinuxA free, open-source desktop app for Mac, Windows, and Linux that opens the .pub extension through its built-in libmspub engine. A good offline choice once you've downloaded the attachment and want to open it on your own machine.
Scribus
Free desktop app✓ Opens .pub filesMac / Win / LinuxA free, open-source page-layout program for Mac, Windows, and Linux that opens .pub files without a Publisher license. Powerful and detail-oriented, with a steeper learning curve better suited to serious layout work than a quick attachment open.
Affinity Publisher 2
Free desktop app✗ No .pub supportMac / Win / iPadFree since October 2025 and a polished modern design app for Mac, Windows, and iPad — but it can't open the .pub extension, so it won't help with that emailed Publisher file. Use PublishMedia or LibreOffice Draw for the .pub itself.
These popular apps are often the first thing people try on a .pub attachment, but none of them can open one:
Learn more
Publish Media Software is independent and is not affiliated with, endorsed by, or sponsored by Microsoft Corporation. Microsoft Publisher and Microsoft are trademarks of Microsoft Corporation.