Convert Publisher PUB to HEIC Online

Microsoft Publisher (.pub) is the desktop publishing application included in some Microsoft Office Professional and 365 editions on Windows, used for newsletters, brochures, flyers, business cards, and church bulletins. Publisher has no native macOS, iOS, Android, or Linux client - it's Windows-only, which makes .pub files notoriously difficult to share. Recipients on Mac or mobile typically cannot open them without buying the Office Professional license and a Windows machine or VM. Converting PUB to HEIC produces a compact per-page image in the format Apple devices handle natively - a natural fit when the people who can't open the .pub are exactly the Mac and iPhone users.

The .pub format is proprietary, undocumented at the byte level by Microsoft, and only loosely supported by third-party tools. LibreOffice Draw can open Publisher 2003 and earlier files reasonably well via reverse-engineered importers, but later versions (Publisher 2007/2010/2013/2016/2019/365) have additional features that often fail to round-trip. The cleanest conversion path is to open the file in Publisher itself and use File > Export > Save as PDF, then run PDF-to-HEIC. This converter routes through that pipeline server-side, rasterizing each page at the publication's page size and encoding it as HEIC at roughly half the file size of a JPG render.

Small businesses, churches, schools, and community organizations whose previous secretary used Publisher to create the weekly bulletin or quarterly newsletter are the typical audience. When the original .pub file is the only surviving copy and the recipients are reading on iPhones and iPads, HEIC-per-page opens natively in Photos and Mail with zero installs. For mixed audiences that include Windows or Android readers, convert the output onward via HEIC to JPG. For ongoing editing migrate to Affinity Publisher (Mac/Win, opens PUB via PDF intermediate) or Scribus (free, cross-platform, no native PUB support but excellent for new layouts).

Microsoft Publisher first shipped in 1991 as Microsoft's entry-level desktop publishing tool, aimed at home users and small businesses producing newsletters, flyers, and brochures. The .pub format is a proprietary binary specific to Windows - Microsoft never released a Mac version, and the format has no published specification. Reverse-engineered import filters exist in LibreOffice (via libmspub) but layout fidelity is imperfect. Publisher remains bundled with certain Microsoft 365 subscriptions but is being deprecated in favor of Designer and Word. Converting .pub output to HEIC bridges the gap between a Windows-only authoring tool and the Apple devices most readers actually hold.

Converting PUB to HEIC renders each page or slide as a fixed image - The layout, fonts, tables, and graphics captured exactly as they appear, in a format roughly half the size of the equivalent JPG render. The result is a read-only visual snapshot that cannot be edited, reflowed, or accidentally modified by the recipient's software.

This suits Apple-device reference workflows: page images of contracts, reports, slides, and drawings stored as HEIC open instantly in Quick Look, Photos, and Files on Mac, iPhone, and iPad, and occupy minimal iCloud space even for long documents. No office software or PUB viewer is needed at any point after conversion.

Because HEIC support is thin outside the Apple ecosystem, use this conversion when the images are for your own devices or an Apple-based team. When page snapshots need to travel to unknown recipients, Windows systems, or web uploads, converting the document to JPG produces the universally compatible equivalent.