| Feature | Online Language (Windows Settings) | Offline Installer (ODT/VL) | | :--- | :--- | :--- | | | Yes (every install) | No (after source creation) | | Deployment Speed | Varies (5–20 min per PC) | Fixed (2–3 min per PC) | | Version Control | Microsoft pushes latest (may break add-ins) | Locks to specific Office build | | Multi-Language | Install one at a time painfully | Install 30 languages in one command | | Air-Gapped PCs | Impossible | Fully supported | | Repair Options | Redownloads entire pack | Uses local cache |
Method 1: Office Deployment Tool (Best for Professionals/Multiple PCs) office 2021 proofing tools offline installer best
: This is technically an "online" setup that downloads data during the process, so it is less ideal for true air-gapped systems than Method 1. Summary of Benefits | Feature | Online Language (Windows Settings) |
If you only need proofing tools for one specific language, you can download the full Language Pack offline installer. Language packs automatically include the proofing tools for that language. This method allows you to download proofing tools
This method allows you to download proofing tools once and install them on multiple machines without an internet connection.
For volume license customers (organizations with Software Assurance or an Enterprise Agreement), the offline installer is available via the or the Microsoft 365 Admin Center (for certain licenses). However, these are not accessible to the average user.