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DISM offline requires you to have the dism source files that will fix Windows on your computer.<br />
DISM online will get the files it needs online while it is running.<br />
Unless you have some reason to be offline, run DISM online. Easier and more likely to have no problems.
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DISM offline requires you to have the dism source files that will fix Windows on your computer.
DISM online will get the files it needs online while it is running.
Unless you have some reason to be offline, run DISM online. Easier and more likely to have no problems.

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?<br />
Offline/online has nothing to do with being offline or online (=internet access). It tells the dism command to work with the current system (=online) or with an offline image (=offline).
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?
Offline/online has nothing to do with being offline or online (=internet access). It tells the dism command to work with the current system (=online) or with an offline image (=offline).

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Offline needs the source files to be present (which sometimes are not). Online does go out and get the new files if need be.
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Offline needs the source files to be present (which sometimes are not). Online does go out and get the new files if need be.

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Agree with McKnife. Online works with the currently running OS. Offline works with WIM files that are not actively running.
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Agree with McKnife. Online works with the currently running OS. Offline works with WIM files that are not actively running.

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No John. That's &quot;features on demand&quot; and has to do with the /source flag. Totally different.
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No John. That's "features on demand" and has to do with the /source flag. Totally different.

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What is the main difference between DISM offline vs DISM online
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What is the main difference between DISM offline vs DISM online

DISM offline vs online

Windows Server 2012 is the server version of Windows 8 and the successor to Windows Server 2008 R2. Windows Server 2012 is the first version of Windows Server to have no support for Itanium-based computers since Windows NT 4.0. Windows Server 2012, now in its second release (Windows Server 2012 Release 2) includes Foundation, Essentials, Standard and Datacenter, and does not support IA-32 or IA-64 processors.