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Open Asset Import Library (Assimp)

Free#16 of 31 in 3D File Converter Software

Open Asset Import Library (Assimp): A capable open-source foundation for embedding 3D format support in software. Ranked #16 of 31 in 3D File Converter Software by our editors (7.7/10); pricing: Open source; best for developers needing open-source 3D conversion.

7.7/10Editor score
Visit Assimp
Open Asset Import Library (Assimp)7.7 Visit Assimp

At a glance

  • Editor score
    7.7 / 10
  • Pricing
    Open source
  • Best for
    Developers needing open-source 3D conversion
  • Paid from
    Free
  • Format scope
    Mixed
  • Facts checked
    22 Sep 2026
Open Asset Import Library (Assimp) screenshot

  • Where it wins

    • Imports more than 40 3D model formats
    • Supports animation data, materials, textures, and node hierarchies
    • Offers C/C++ APIs plus bindings for multiple languages

  • Where it doesn't

    • Exports cover selected formats rather than the full import range
    • Batch conversion is less complete than in enterprise converters
    • It is a library and source project, not a hosted converter

Our verdict on Open Asset Import Library (Assimp)

Open Asset Import Library (Assimp) is an open-source developer library for loading 3D scenes into a shared in-memory representation. It is intended for game engines, graphics applications, asset pipelines, and other software that needs embedded 3D format support. Assimp runs on Windows, macOS, Linux, iOS, and Android, and provides C and C++ APIs alongside bindings for C#/.NET, Python, D, Java, Delphi, and other languages. Integrations include Unity, Unreal Engine, and Rust.

Its strongest area is scene and asset coverage on the import side. Assimp imports more than 40 3D model formats and can handle mesh geometry, materials, textures, node hierarchies, static and skinned meshes, and bone animations. Mesh post-processing includes triangulation, normal generation, tangent generation, and mesh optimization. Optional command-line tools and viewer components extend the project beyond its core library, while the shared representation can help software work with different source formats through a common structure.

The main trade-off is scope: export support is limited to selected formats, including OBJ, STL, PLY, STEP, and glTF, so teams needing broad two-way conversion may need another option. The project is also a library and source project rather than a hosted converter with subscription plans, making it a better fit for developers embedding conversion into an application or pipeline than for users seeking a ready-made web workflow. Choose Assimp when open-source access, API integration, animation data, and multi-language support matter most; consider an enterprise converter instead when expansive exports or more complete batch conversion are central requirements.

Your product? Our editors can test Open Asset Import Library (Assimp) in depth and publish a review, labelled as paid · from $149/mo →

Open Asset Import Library (Assimp) pricing

Plans Open sourceFree Free to use — no paid tier required for the core job.
See plans on assimp.org

Open Asset Import Library (Assimp) fact sheet

Free planNot verified
Paid fromFree
Format scopeMixed
Animation conversionYes
Batch conversionNot verified
API accessYes
Maximum file sizeNot verified
Supported platformsWindows, macOS, Linux, iOS, Android
DeploymentSelf-hosted
PlatformsWindows, macOS, Linux, iOS, Android
SupportCommunity, Docs
Built forSolo, Small business, Mid-market, Enterprise (editorial estimate)
Integrations8 integrations: C#/.NET, Python, D, Java, Delphi, Unity …
PricingOpen source
Websiteassimp.org
Facts checked22 Sep 2026

Open Asset Import Library (Assimp) integrations

Open Asset Import Library (Assimp) lists 8 integrations on its own site.

  • C#/.NET
  • Python
  • D
  • Java
  • Delphi
  • Unity
  • Unreal Engine
  • Rust

Alternatives to Open Asset Import Library (Assimp)

See all Open Asset Import Library (Assimp) alternatives →

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Featured on iTechGuides

Featured on iTechGuides — Open Asset Import Library (Assimp) 7.7/10

Open Asset Import Library (Assimp) is listed in our 3D File Converter Software directory. Add the badge to your site — it links back to this page.

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Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026

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