PK4 is the data archive for id Tech 4 games like Doom 3 - a ZIP under another name holding the maps, textures, models and scripts. id Software long shipped game data as renamed ZIPs - .pak, .pk3, then .pk4 - so the engine could load assets straight from the archive. Analyser handles .PK4 alongside related formats such as .Assets, .Bundle, .Resource and more. In Analyser's format library, .PK4 sits in the Games category.

How do I open a .PK4 file?

Drop a .PK4 file onto Analyser at https://lab.valjdakosta.com/ and it is identified directly in your browser - no upload, no account and no software to install. Identify and read more game and emulator files: Unity asset bundles, Unreal cooked assets, CISO/CHD disc images, FMOD/Wwise sound banks, Spine skeletons and atlases, GameMaker/LDtk/TIC-80 projects, Minecraft Anvil regions, Warcraft III maps, Ren Py and RPG Maker data, extra console ROMs (Atari, PC Engine, Master System/Game Gear, WonderSwan, 3DS homebrew), xdelta/Basis patches and emulator saves and movies.

Can I open a .PK4 file online for free?

Yes. Analyser is a free online .PK4 identifier that runs entirely in your browser - your .PK4 file never leaves your device, so there is nothing to upload and no software to install. It even works offline once installed.

.PK4 file - what it is and how to identify it online

Click here to analyse any file

Home › Formats › .PK4ID

What is a .PK4 file?

PK4 is the data archive for id Tech 4 games like Doom 3 - a ZIP under another name holding the maps, textures, models and scripts.

Did you know: id Software long shipped game data as renamed ZIPs - .pak, .pk3, then .pk4 - so the engine could load assets straight from the archive.
Analyser handles .PK4 alongside related formats such as .Assets, .Bundle, .Resource and more.
In Analyser's format library, .PK4 sits in the Games category.
What Analyser reads: Identify and read more game and emulator files: Unity asset bundles, Unreal cooked assets, CISO/CHD disc images, FMOD/Wwise sound banks, Spine skeletons and atlases, GameMaker/LDtk/TIC-80 projects, Minecraft Anvil regions, Warcraft III maps, Ren Py and RPG Maker data, extra console ROMs (Atari, PC Engine, Master System/Game Gear, WonderSwan, 3DS homebrew), xdelta/Basis patches and emulator saves and movies.
Depth of analysis: .PK4 is an identification-grade format: Analyser recognises it from its bytes and decodes the header metadata it carries, rather than opening it in a full viewer. Formats that do get a full viewer are marked "Full" on the formats page.
Open a .PK4 file: Drag a .PK4 file onto the Analyser home page (or tap to pick one). It is identified entirely in your browser - nothing is uploaded, there is no account, and it works offline once installed.
Related formats: .Assets · .Bundle · .Resource · .UTOC · .UCAS · .UEXP · .UMD · .CSO · .CHD · .FSB · .Bank · .BNK · .WEM · .Spine · .Skel · .Atlas · .YYP · .YY and more. See all supported file types.