FModel

FModel is free, open-source Windows software for exploring and extracting content from games made with Unreal Engine. It can browse archives such as .pak, .utoc, and .ucas, including Unreal Engine 4 and 5 formats, and compare two game states to identify new or modified packages. Encrypted archives require an AES key. FModel parses more than 30 asset types, displays their properties, and can show package information in JSON, INI, XML, or TXT. Image, audio, and 3D viewers help inspect supported assets, including static and skeletal meshes, animations, maps, and sounds. Loaded models can be saved as PSK files. An Export Session window supports batches of raw data, model, world, texture, and animation exports. The August 2026 release added USD export for meshes, animations, materials, and worlds, along with WebP export and texture quality settings. Whole-level export is in USDA format, and sockets or attachments may not always be placed correctly. FModel is distributed as a portable x64 executable in a ZIP archive, requires .NET 10.0 or later, and some games may need up to 2 GB of free RAM.

FModel offers archive browsing, asset previews, and several export workflows at no cost. Check the Windows and .NET requirements, and note the stated limits on animation previews and world exports.

FModel suits Windows users who need to inspect, compare, or export assets from Unreal Engine games. It may also suit contributors interested in an open-source project.

FModel is a free, open-source Windows tool for inspecting and extracting content from Unreal Engine games. It suits modders and technical users who want to examine archives, compare game updates, or move supported assets into other software. Its breadth of viewers and export options is useful, though platform and animation limits narrow its fit.

Overview

FModel opens Unreal Engine 4 and 5 archives, including .pak, .utoc and .ucas files, and can display encrypted archives when you provide an AES key. That makes it useful for inspecting game content you can access, but it does not bypass encryption. Comparing archive states highlights new or modified packages, which can save time when tracking changes between game updates.

Users can extract packages, inspect their properties, and export data in JSON, INI, XML or TXT. The project has been in development since March 5, 2019; its code is open for reuse under its license, and it welcomes contributions through issues and pull requests. Community troubleshooting is available through Discord.

Key features

FModel parses more than 30 asset types and displays their properties. Its image, audio and 3D viewers let users examine supported content before moving it into another application. Static and skeletal meshes, maps and sounds are among the described preview types. Animation is the notable gap: the wiki says animation preview is unavailable, although AnimSequence assets can be exported as PSA.

Loaded models can be saved as PSK for use in tools such as Blender or 3DS Max. The August 2026 release broadened export options with USD support for meshes, animations, materials and worlds, plus WebP export and texture quality settings. Whole-level export is available in USDA format; world export remains limited to USD, and sockets or attachments may not land in the right positions. An Export Session window can batch raw data, model, world, texture and animation exports, a practical advantage for users handling many assets at once.

Pricing

FModel is freeware at free, with no payment required. There is no paid plan or free trial. The free edition includes archive extraction and the described inspection and export workflows, so there is no cheaper tier that trades away features. Its meaningful costs are practical: users need a Windows system, .NET 10.0 or later, and some games may require up to 2 GB of free RAM.

Platforms

FModel runs only on Windows and is distributed as a portable x64 executable in a ZIP archive. Installation involves downloading FModel.zip from the latest release assets. The portable format avoids a conventional installer, but Windows exclusivity rules it out for users who need a native macOS or Linux application.

Who it's for

FModel is a strong fit for Windows-based modders and technical users working with Unreal Engine archives. Archive comparison, package property exports, asset viewers and batch export address different stages of inspection and extraction in one tool. It is less suitable for users who need animation previews, reliable placement of every world attachment, or a cross-platform workflow.

Pros and cons

• Pro: Broad archive support covers Unreal Engine 4 and 5 formats, including .pak, .utoc and .ucas.
• Pro: Comparing archive states helps pinpoint new and modified packages after updates.
• Pro: Multiple viewers, property formats and batch export reduce the need to handle every asset one at a time.
• Con: Animation preview is unavailable, so users must export AnimSequence assets as PSA for that part of their workflow.
• Con: Whole-world export is currently USD-only, and sockets or attachments may be misplaced.
• Con: Windows-only support and the .NET 10.0-or-later requirement exclude some systems and setups.

Alternatives

For a broader set of modding options, browse Game Modding Tools. UAssetGUI is another free choice for Linux and Windows users who want MIT-licensed software. Choose QuickBMS if a free, open-source multiplatform tool better suits the job. WolvenKit is free and open source under GPL-3.0 for research and educational use. xEdit is a free Windows option with no stated price or usage limits.

Minecraft Launcher is free to download across Android, iOS, Linux, macOS and Windows, while access to games requires ownership or a time-limited demo. NetRadiant-Custom is a free, open-source level editor with ready-to-use release packages. OpenMW-CS is a free, open-source construction set for the OpenMW game engine. Arma 3 Tools is free for non-commercial use; commercial use requires Bohemia Interactive permission and acceptance of its tools EULA. For a different file-management category, see Terminal File Managers.

Verdict

Windows modders and technical users who need to inspect Unreal Engine archives, compare package changes and export supported assets should start with FModel: it combines those workflows at no cost. Look elsewhere if you need animation previews, dependable world attachment placement, or support beyond Windows.