Quick answer: most often, Publisher simply isn't on your computer any more: Microsoft removed it from Microsoft 365 in October 2026. Open the file in Free Pub Editor instead. If that shows an error, the file may be an SSH key, still zipped, an online-only OneDrive placeholder, a damaged download, or from Publisher 97 or earlier.
Quick diagnosis
| What happens | Likely cause | Fix |
|---|---|---|
| Double-clicking does nothing, or Windows asks which app to use | Publisher isn't installed | Open it in a .pub reader in your browser |
| "This isn't a Microsoft Publisher file" | An SSH key, or a file renamed to .pub | Open it in Notepad or TextEdit to check |
| File name ends in .zip, or shows a zipper icon | Still compressed | Extract it first |
| Cloud icon next to the file in OneDrive | Online-only placeholder | Let it download, or choose "Always keep on this device" |
| "This Publisher file looks damaged" | Incomplete download or attachment | Download it again |
| "This file is from Publisher 97 or earlier" | Very old format | Ask for a PDF or a newer copy |
| "This file is over 60 MB" | Lots of large photos | Ask for a smaller copy or a PDF |
Is Publisher still installed?
This is the most common reason in late 2026. Microsoft's own page says Microsoft 365 subscribers "will not be able to access Publisher on or shortly after October 1, 2026" (Microsoft Support). Support for one-off versions such as Publisher 2021 ended on 13 October 2026, though Microsoft says those copies can still be installed and used.
Microsoft never made a free Publisher viewer either, so Word, Edge and the Photos app can't help. The fix is to open the file somewhere else:
- Go to freepubeditor.com/editor in Chrome, Edge, Safari or Firefox.
- Click Open and choose the .pub file, or drag it onto the page.
The file is read in your browser and isn't uploaded. Files from Publisher 2002 through Microsoft 365 open with their layout. For the full timeline, see Publisher retirement dates.
Is it really a Publisher file?
Not every .pub file comes from Publisher. SSH, the tool people use to log in to servers, saves public keys with the same ending: its manual says the public key is "stored in a file with the same name but '.pub' appended" (OpenBSD manual). A file called id_rsa.pub or id_ed25519.pub is almost certainly a key.
To check, open the file in Notepad (Windows) or TextEdit (Mac):
- An SSH key is one line of readable text that starts with a key type such as
ssh-ed25519,ssh-rsaorecdsa-sha2-nistp256, followed by a long run of letters and numbers (sshd manual). It isn't a document, so there's nothing to open. If it's yours, don't change it. - A Publisher file shows mostly unreadable symbols, with the odd readable word. That's normal.
Free Pub Editor shows "This isn't a Microsoft Publisher file" for keys and for other files that have been renamed to end in .pub.
Is the file still inside a zip?
Schools and offices often send several publications in one .zip file. Opening the .pub straight from inside the zip can fail or give you a temporary copy, so extract it first:
- Windows: right-click the zip, choose Extract All, then open the .pub from the new folder.
- Mac: double-click the zip in Finder; it unpacks into a folder next to it.
- Chromebook: open the zip in the Files app, then copy the .pub out to My files.
Is it an online-only OneDrive file?
OneDrive can show files that aren't actually on your computer yet. Microsoft explains that a blue cloud icon next to a file means "the file is only available online" (Microsoft Support). It downloads when you open it, which needs an internet connection.
If the file won't open from a website or an offline laptop, right-click it in File Explorer and choose Always keep on this device, wait until the cloud icon changes to a green tick, then try again.
Was the download or attachment damaged?
A download that stopped part way, or an email attachment that was blocked or trimmed, leaves a broken file. Signs include a size of 0 KB or far smaller than expected. Free Pub Editor shows "This Publisher file looks damaged and could not be opened."
- Download it again, from the original email or link rather than a forwarded copy.
- Ask the sender to put it in a zip file or share a cloud link instead of attaching it directly.
- If you have an older copy, from a backup or a colleague, try that.
Is the file very old or very large?
Free Pub Editor reads Publisher 2002 and later with layout, and Publisher 2000 as text only. Files from Publisher 97 or earlier show a message saying so and can't be opened yet. If you only need the content, ask whether there's a PDF or printed copy.
Files over 60 MB are turned away so your browser doesn't run out of memory. Big files are usually big because of full-size photos. Ask the sender for a PDF, or a copy with smaller pictures. For comparison, a 24 MB, 14-page school newsletter opened fine in our tests.
What do the other error messages mean?
| Message | What it means | What to try |
|---|---|---|
| "This Publisher file is too complex to open here." | The file has far more structure than the editor can safely read | Ask for a PDF, or split the publication into smaller files |
| "This Publisher file has no text or pictures to show." | The file opened, but its pages are empty | Check you have the right version; ask the sender for the finished copy |
If the file opens but looks wrong, with changed fonts, missing pictures or text in the wrong box, that's a different problem. See why does my .pub file look wrong?
What other programs can open .pub files?
LibreOffice Draw can import many .pub files on Windows, Mac and Linux, though it can't save back to .pub. If one reader rejects a file, it's worth trying another. See can LibreOffice open .pub files? and our Publisher alternatives comparison.
Common questions
Why won't my .pub file open after October 2026?
Is every .pub file a Publisher file?
What does 'This Publisher file looks damaged' mean?
Can I open a Publisher 97 file?
Try opening your .pub file here
Free, in your browser. The file stays on your device.
Open the editor