Need to check whether your Microsoft Office is 32-bit or 64-bit? You’re not alone — Microsoft doesn’t advertise it. Here’s how to check your Office version, 32-bit or 64-bit, in about ten seconds, plus how to check Windows and which one you actually need.
Key Takeaways:
- Check in seconds: open any Office app, go to File > Account > About, and the bitness is printed at the top of the window.
- On 64-bit Windows, Microsoft installs 64-bit Office automatically for Microsoft 365, Office 2019, 2021, and 2024 — 32-bit only happens if you choose it.
- You can’t run 32-bit and 64-bit Office apps on the same PC at the same time — switching means a full uninstall and reinstall.
- Windows 11 has no 32-bit edition, so if you’re on Windows 11, that half of the question is already answered.
- Your product key isn’t tied to a bitness — the same license installs either version.
How Do I Check If My Office Is 32-Bit or 64-Bit?
Open Word or Excel, click File, then Account, then About Word (or About Excel). The bitness — 32-bit or 64-bit — is printed at the top of the window that opens.
This works the same way across Microsoft 365, Office 2024, 2021, and 2019:
- Open any Office app — Word, Excel, PowerPoint, or Outlook.
- Click File in the top-left corner.
- Select Account (older versions may label this Help).
- Click About Word (or About Excel, About PowerPoint, etc.) — a small window pops up.
- Read the first line: it shows the version number, build, and either “32-bit” or “64-bit.”
That’s it — no downloads, no digging through system settings. Microsoft’s own instructions for this are here: About Office: What version of Office am I using?
Which Is Better: 32-Bit or 64-Bit Office?
For most people on a modern PC, 64-bit is the better pick — it’s the default, handles large files better, and is what Microsoft recommends unless you need older 32-bit add-ins.
| Factor | 32-bit Office | 64-bit Office |
|---|---|---|
| Best for | Old add-ins, ActiveX controls, legacy VBA | Everyday use on a modern PC |
| Default on | Office 2016 only | Microsoft 365, Office 2019, 2021, 2024 |
| Large spreadsheets / datasets | Smaller memory ceiling | Handles bigger files well |
| Windows version needed | Works on both | Requires 64-bit Windows |
| Microsoft’s general advice | Only for specific compatibility needs | Recommended for almost everyone |
Is Office 32-Bit or 64-Bit by Default?
Yes. On 64-bit Windows, Microsoft 365 and Office 2019, 2021, and 2024 all install the 64-bit version automatically — you’d have to choose 32-bit on purpose during setup.
According to Microsoft’s official guidance, this flips only for Office 2016, where 32-bit was the default. Microsoft 365, Office 2019, 2021, and 2024 all use Microsoft’s Click-to-Run installer, which is why the bitness choice appears during setup rather than as a separate installer file.
Why Would I Ever Need the 32-Bit Version?
Mainly compatibility: older 32-bit add-ins or ActiveX controls with no 64-bit version, VBA macros using Declare statements, or a PC still running 32-bit Windows.
Microsoft’s compatibility page lists a few specific cases: 32-bit COM add-ins or ActiveX controls with no 64-bit alternative, older Access .mde/.ade/.accde files, and VBA code using Declare statements written for 32-bit systems. If none of that sounds familiar, you almost certainly don’t need it.
How Do I Check If My Windows Is 32-Bit or 64-Bit?
Open Settings, click System, then About. Under Device specifications, System type tells you 32-bit or 64-bit — though Windows 11 is always 64-bit.
- Click the Start menu and open Settings.
- Select System in the left-hand menu.
- Scroll down and click About.
- Under Device specifications, find System type — it lists your Windows bitness and processor architecture.
Worth knowing: if you’re already on Windows 11, this is already settled — Windows 11 was never released in a 32-bit edition. The choice only applies to Office.
How Do I Switch Between 32-Bit and 64-Bit Office?
Uninstall your current Office completely, then reinstall from account.microsoft.com, choosing the opposite bitness under Other install options before you click Install.
- Fully remove your current Office first — leftover files can cause conflicts. Our Office removal tool guide covers a clean uninstall on Windows or Mac.
- Sign in at office.com or account.microsoft.com with the account tied to your license.
- Look for Other install options (not the main Install button) and choose the opposite bitness and language from the dropdowns.
- Download and run the installer, then activate Office with your product key if it doesn’t sign in automatically.
If the install seems to freeze partway through, see our guide on Microsoft Office installation getting stuck. Your documents stay untouched either way — uninstalling only removes the applications. (Mac users skip this decision — Office for Mac ships 64-bit only.)
Frequently Asked Questions
Does 32-bit or 64-bit Office run faster?
For typical documents and emails, barely noticeable. The gap shows up with heavy files — large spreadsheets, big databases, or Power Pivot models — where 64-bit’s larger memory ceiling matters.
Do I need a different license or product key for 64-bit versus 32-bit?
No. Your product key isn’t tied to a specific bitness — the same key activates either install, so switching later costs nothing extra.
What happens to my documents if I switch Office bitness?
Nothing. Uninstalling and reinstalling Office only affects the applications themselves. Files saved in OneDrive, Documents, or anywhere else on your PC stay exactly where they are.
Is 64-bit really necessary for large Excel spreadsheets?
If you work with big datasets, multiple large workbooks, or Power Pivot, yes — 32-bit Excel is capped around 2 GB of memory per process , while 64-bit can use far more of your PC’s RAM.
Do I need to choose 32-bit or 64-bit on a Mac?
No. Office for Mac only ships as 64-bit, so this is strictly a Windows decision.
Already Planning a Clean Reinstall?
If working through this checklist turned into “I should just reinstall Office properly,” you don’t need to track down an old key and hope it still activates. Office 2021 Professional Plus ($64.99) is a genuine one-time license for Word, Excel, PowerPoint, Outlook, Publisher, Access, and OneNote — the same key works whichever bitness you choose. Your key and download link arrive by email in 15–45 minutes, backed by a 180-day replacement warranty and live chat or email support if you run into trouble.
