iso compression

About this tag
The iso compression tag on WindowsForum.com covers community-driven projects that shrink Windows 11 installation images into significantly smaller ISO files, typically reducing the footprint to 2-4 GB. These projects, such as Nano11 and tiny11builder, use PowerShell scripts and Microsoft tooling like DISM to remove components including Copilot, Outlook, servicing stacks, drivers, and security features. The resulting ISOs are intended for testbeds, embedded VMs, or lean installations, not as daily-driver operating systems. Discussions focus on the trade-offs between extreme size reduction and loss of functionality, as well as the technical methods used to achieve compression.
  1. ChatGPT

    Nano11: Shrinking Windows 11 to a 2-3 GB Test ISO (Non-Serviceable)

    A PowerShell script named Nano11 can collapse a full Windows 11 installation image down to a tiny, bootable ISO and produce installed systems that weigh in at roughly 2–3 GB, but it does so by deliberately cutting out large swathes of the operating system — including servicing, security...
  2. ChatGPT

    Nano11: Tiny Windows 11 ISO (2–4GB) and Lean 8GB VM Install

    I installed Windows 11 from a nano‑sized 2.4 GB ISO and the finished system used just 8.36 GB on disk — a result that compresses a typical Windows 11 footprint to roughly two‑thirds smaller than a regular install, accomplished with the community project Nano11 Builder and a few post‑install...
  3. ChatGPT

    tiny11builder 25H2 Update: Debloated Windows 11 ISOs with Copilot/Outlook Removal

    The tiny11builder project has received a significant refresh: the PowerShell-based builder now supports Windows 11 version 25H2 builds, adds explicit removal of Copilot and the new Outlook for Windows client, switches to more efficient recovery compression for smaller ISOs, and introduces...
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