What is a .pak file?
Game Package / Archive File · Archive
A .pak file is a game data package: textures, models, sounds and scripts bundled into one archive so the engine loads them fast. Each engine defines its own PAK layout, so there is no single format.
What is a .pak file used for?
The name goes back to id Software's Quake, whose PAK archives started with the ASCII bytes PACK. Modern engines kept the extension but not the layout: Unreal Engine .pak files, for example, use their own structure with optional compression and encryption.
Many PAKs are ZIP archives in disguise (Quake 3's .pk3 openly so), which is why trying 7-Zip is the standard first move. Modding tools per game handle the rest; repacking wrongly can corrupt the game.
What opens a .pak file?
The .pak format opens in the following apps, grouped by operating system. If one app does not work, try another from the same list.
Windows
- 7-Zip (if ZIP-based)
- game-specific modding tools
- PakExplorer-style utilities
macOS
- The Unarchiver (if ZIP-based)
- game-specific tools
Linux
- 7-Zip / unzip (if ZIP-based)
- game-specific tools
Open a .pak file step by step
- Confirm the file really is a .pak. Drop it into the WhatFileType identifier, which reads its signature in your browser without uploading anything.
- On Windows, open it with 7-Zip (if ZIP-based) or game-specific modding tools.
- On Mac, use The Unarchiver (if ZIP-based) or game-specific tools.
- On Linux, try 7-Zip / unzip (if ZIP-based) or game-specific tools.
- Still stuck? Convert the .pak to zip (repack, engine-dependent), which opens more widely.
Why can't I open my .pak file?
Almost always because no installed app understands PAK. Install one of the apps above, or convert the file to a format your existing software already reads. If double-clicking opens the wrong program instead of nothing at all, the file association is set to the wrong app rather than the file being broken.
The other possibility is that the file is not really a .pak at all. Drop it into the file identifier to check it by its bytes instead of its name. Nothing is uploaded.
How to convert a .pak file
You can convert a .pak file to zip (repack, engine-dependent) using a conversion tool or the export menu of an app that opens it.
PAK has no fixed magic number, so there is no signature table on this page. Its bytes alone do not prove the format: identification relies on the extension, the structure of the content and the program that created it. The magic-numbers reference lists the formats that do carry one.
Frequently asked questions
What is a .pak file?
A .pak file is a game data package: textures, models, sounds and scripts bundled into one archive so the engine loads them fast. Each engine defines its own PAK layout, so there is no single format.
How do I open a .pak file?
Try 7-Zip first, since many PAKs are ZIP-based. If that fails, the file uses the game engine's own layout and you need that game's modding or unpacking tool.
Can I delete .pak files to save space?
Not from an installed game: they are its assets, and the game will break or re-download them. Only delete PAKs belonging to mods you no longer use.
Why does my extracted .pak content look scrambled?
Some engines compress or encrypt their PAKs (modern Unreal games often do). Generic tools then show garbage; only a tool for that specific game can unpack them.
Related formats
Sources
Details on this page were checked against authoritative references. How sources are ranked and what is deliberately left out is set out in the methodology.