Microsoft uses Electronic Software Download (.ESD) compression, which features a higher compression ratio than standard .ISO files. This can safely reduce a 5GB image to roughly 2.5GB to 3GB.
Although Microsoft officially ended retail sales and mainstream support for Windows 7 years ago, you can still download an ISO directly from Microsoft if you have a valid product key: windows 7 iso highly compressed
Several compression formats and methods can be used to shrink a Windows 7 ISO: Microsoft uses Electronic Software Download (
The individuals who host "highly compressed" ISOs often inject malicious code into the setup files. Because you are installing this directly as your operating system, the malware gains administrative privileges before your antivirus software can even run. This can lead to keyloggers tracking your passwords, ransomware locking your files, or your computer joining a botnet. 2. System Instability and Crashes Because you are installing this directly as your
Always create your own compressed ISO from a known good source (e.g., an untouched MSDN ISO) using the tools below.