This method is a hybrid approach—it uses Steam for authentication but bypasses Steam‘s content download servers, instead pulling game files from a local archive.
Windows 10 and 11 have a built-in deployment tool called compact.exe that compresses game folders without breaking them. You can use a safe, open-source visual tool called to shrink TF2. Download CompactGUI from a trusted source like GitHub. Select your Team Fortress 2 folder. Choose the XPRESS8X or LZX compression algorithm. team fortress 2 highly compressed
For players who want to reduce the game's size themselves without downloading a shady "highly compressed" version, there are community-approved manual methods using mods and configuration files. This method is a hybrid approach—it uses Steam