What Is a PUB File?
A .pub file (short for "Publisher") is a document format created by Microsoft Publisher, a desktop publishing application that has been part of Microsoft Office and Microsoft 365 for over 30 years. Unlike Word documents (.docx) which are primarily for text, PUB files are designed for layout-heavy publications — think flyers, brochures, newsletters, business cards, posters, and catalogs.
Publisher positions itself as an entry-level desktop publishing tool, sitting between Microsoft Word (too limited for layout) and professional tools like Adobe InDesign (too expensive and complex). This made it popular in small businesses, schools, churches, and non-profits that needed professional-looking publications without a professional designer's budget.
What's Inside a PUB File?
Under the hood, a PUB file uses Microsoft's OLE/CFB (Object Linking and Embedding / Compound File Binary) container — the same storage format used by older .doc and .xls files. Inside this container, you'll find:
- Text content — formatted with fonts, sizes, colors, and styles
- Images — embedded photos, logos, and illustrations in various formats
- Shapes and vectors — rectangles, circles, lines, arrows, and custom shapes
- WMF/E MF fills — Windows Metafile vector graphics used in older Publisher templates
- Tables and charts — data tables and simple charts for brochures and reports
- Master pages — reusable page templates (headers, footers, page numbers)
- Color profiles — CMYK or RGB color schemes depending on the publication type
Who Uses PUB Files?
PUB files are most commonly found in:
- Small businesses — creating flyers, menus, price lists, and marketing materials
- Schools and universities — newsletters, event posters, and student handbooks
- Non-profits and churches — bulletins, fundraising brochures, and event programs
- Real estate agents — property flyers and listing sheets
- Event planners — invitations, programs, and signage
- Retail stores — sale flyers, product tags, and shelf signs
Which Publisher Versions Are Supported?
Microsoft Publisher has been through many versions over the years. The PUB format has evolved, but the core OLE/CFB structure has remained consistent. Here's a quick overview:
| Publisher Version | Year | Format Notes |
|---|---|---|
| Publisher 98 | 1998 | Early format, limited features |
| Publisher 2000 | 2000 | Improved OLE/CFB support |
| Publisher 2002/XP | 2001 | Added master pages |
| Publisher 2003 | 2003 | Professional color printing support |
| Publisher 2007 | 2007 | New ribbon interface, enhanced graphics |
| Publisher 2010 | 2010 | Improved image handling |
| Publisher 2013 | 2013 | Touch-enabled, cloud integration |
| Publisher 2016 | 2015 | Modern template library |
| Publisher 2019 | 2018 | Last standalone version |
| Publisher for Microsoft 365 | 2019-2026 | Subscription model |
LibreOffice Draw — the engine behind PubViewer — supports all versions from Publisher 98 through the latest Microsoft 365 releases.
Why You Need a PUB Viewer
There are several reasons you might need to view a PUB file without having Microsoft Publisher installed:
- You don't have a Microsoft 365 subscription — Publisher is only available in Business and Enterprise plans, not Personal or Family
- You're on a Mac — Publisher was never released for macOS
- You're on mobile — No Publisher app exists for iOS or Android
- You received a PUB file from someone else — Clients, vendors, and colleagues often send .pub files
- Publisher is being retired — After October 2026, there will be no supported way to open PUB files natively
Fortunately, there are excellent free alternatives. Our PubViewer tool converts PUB files to PDF using LibreOffice Draw — the same engine trusted by major conversion services — right in your browser. No installation, no account, and files are auto-deleted after conversion.