In the late 90s and early 2000s, it was not uncommon for executable installers bundled with pirated PAK files to contain malware. While a .pak file itself is data (not executable), verifying the file hash is the only way to ensure the data hasn't been tampered with—such as injecting malicious code into the game logic files or inserting inappropriate custom content.
md5sum pak0.pak # Linux/Mac certutil -hashfile pak0.pak MD5 # Windows quake 1 pak files download verified
Warning: distributing or downloading commercial game files (original Quake PAK/WAD/PAK0.pak) without a legal license may violate copyright. This guide assumes you own a legal copy of Quake or are using a legitimately free/open-source replacement (see step 1). In the late 90s and early 2000s, it
Because old files can become corrupted, or altered by malware, purists use SHA-1 or CRC32 hashes to prove a file is identical to the 1996 retail CD-ROM. The verified hash for the original registered pak0.pak is a specific string of characters. If you find a file online that matches that hash, it is technically authentic—but the source remains illegal. This guide assumes you own a legal copy
Purchasing Quake on Steam or GOG gives you the complete PAK0.PAK and PAK1.PAK files.