File format guide
What is a PUB file — and how do you open one in 2026?
Quick answer
A .pub file is a document created by Microsoft Publisher— typically a flyer, newsletter, menu, card, or label layout. It’s a proprietary format: Word, Canva, and most design apps can’t open it. Publisher itself is being retired on October 13, 2026. You can open any .pub file free in your browser with the viewer below.
| Full name | Microsoft Publisher Document |
|---|---|
| Developer | Microsoft (1991–2026) |
| Category | Desktop publishing / page layout |
| MIME type | application/x-mspublisher |
| Opens with | Publisher (retiring), LibreOffice Draw (imperfect), this site’s free viewer |
Drop a .pub file here
It opens right in your browser — nothing to install.
Free viewer, no signup, no email. Files are deleted from our servers within 2 hours.
Disambiguation
Publisher document or SSH public key? A 10-second check
Two very different things use the .pub extension. If the file is named something like id_rsa.pub or id_ed25519.pub and is under a kilobyte, it’s an SSH public key— a plain text file you can open in any text editor, and nothing to do with Publisher. If it’s named like a document (Fall_Newsletter_2019.pub) and is tens of kilobytes or more, it’s a Publisher document — keep reading.
The deadline
Microsoft Publisher stops working October 13, 2026
Microsoft is removing Publisher from Microsoft 365 on October 13, 2026, and ending support for the perpetual versions. After that date, .pub becomes an orphaned format: the files on your drive don’t change, but the mainstream software that opens them is gone. For a church, school, or small business with years of newsletters on a shared drive, that’s a real archive problem with a real deadline — the full timeline is on our Publisher end-of-life page.
Compatibility
What programs can open a PUB file in 2026?
| Opens .pub? | Layout accuracy | Cost | After Oct 2026 | |
|---|---|---|---|---|
| Microsoft Publisher | Yes | Perfect (it's the native app) | Microsoft 365 | Removed |
| LibreOffice Draw | Yes | Good for simple files; linked text and fonts can shift | Free | Yes |
| Word / Canva / Affinity / InDesign | No | — | — | — |
| Generic online converters | Convert only, no viewer | No preview — convert and hope | Caps, ads, subscriptions | Yes |
| pub rescue (this tool) | Yes — free viewer | Instant preview of every page, so you can see for yourself | Viewer free · $29 once to convert | Built for it |
Choosing what to design with going forward is a separate question — the Microsoft Publisher alternatives comparison ranks every option, including which ones handle .pub at all.
Make it editable
How to convert a .pub file into something you can actually edit
- Open the file in the viewer above. Free, instant, and it confirms the file is a Publisher document and renders correctly.
- Download the free preview conversion — watermarked DOCX or PDF — and verify your content survived.
- Unlock the full export: editable DOCX for Word, SVG for design tools, and full-resolution searchable PDF for the archive. One payment, every format.
Mac
Opening PUB files on a Mac
Publisher never existed for macOS, and the dedicated desktop converters are Windows-only — which is why Mac forums recommend buying Parallels and a Windows license to open one flyer. The viewer on this page is browser-based, so a Mac opens .pub files exactly as well as any Windows machine. Full detail: how to open a .pub file.
The whole folder
Got a whole folder of old .pub files?
Drag the entire folder onto the viewer. It finds every .pub file, shows you each one, and converts them all in a single pass — one-time $29, no subscription, done before the October deadline. Built for the school-office and church-admin scenario: years of accumulated flyers, one afternoon to rescue them.
FAQ
Frequently asked questions
Can Word open a .pub file?
No. Word cannot open or import .pub files. Convert the .pub to DOCX first with a converter like the one on this page, then open the DOCX in Word.
Can Canva open a .pub file?
No — Canva doesn't import .pub. Convert the file to SVG or DOCX first, then bring that into Canva.
Is there a free Publisher viewer?
Microsoft's own support page says 'Publisher doesn't have a viewer.' The viewer on this page fills that gap: it opens any .pub file free in the browser, on any operating system.
Will my .pub files stop working after October 2026?
The files don't change, but on October 13, 2026 Publisher is removed from Microsoft 365 — so most people lose the app that opens them. Converted copies (PDF, DOCX) keep working forever.
How do I open a .pub file without Publisher?
Drop it on the free viewer at the top of this page — it renders in the browser with nothing to install. LibreOffice Draw is a desktop alternative, with some layout compromises on complex files.
What replaced Microsoft Publisher?
Microsoft points users toward Word, PowerPoint, and Designer, but none of them open .pub files. Popular third-party replacements are Canva and Affinity Publisher — see our alternatives comparison for what actually fits, and convert your old files first.
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