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OFF file format (.off)

OFF (Object File Format)

What is a OFF file?

OFF is a minimal academic mesh format: a vertex list and a face list in plain text, nothing else. Its simplicity makes it a favorite in computational-geometry research, mesh-processing courses and tools like CGAL and MeshLab.

  • Trivially simple to parse and generate
  • Common in research and geometry processing
  • Plain text — diffable and scriptable

Best for: Research, teaching and mesh-processing pipelines.

View OFF files online

Open .off files in the free online OFF viewer — assembly tree, section views and display modes, entirely in your browser.

How to open a OFF file

  1. Open the online OFF viewer. It runs in your browser, so there is no software to install and no account to create.
  2. Drop your .off file in. The file is parsed locally and never uploaded. Inspect it with the assembly tree, section views and display modes.
  3. Convert it if you need another format. Press Convert to turn OFF into STL, then download the result straight from your browser.

Convert OFF to other formats

OFF to STLOFF to OBJOFF to PLYOFF to GLBOFF to glTFOFF to 3MFOFF to USDZ

Convert other formats to OFF

STEP to OFFIGES to OFFBREP to OFFSTL to OFFOBJ to OFFPLY to OFFGLB to OFFglTF to OFF3MF to OFFCOLLADA to OFFAMF to OFFFBX to OFF3DS to OFFLAS to OFFPCD to OFFXYZ to OFFPTS to OFF

Frequently asked questions

How do I open a .off file?

Drop it into the free online OFF viewer on this site — it renders in your browser with an assembly tree and section views, and the file is never uploaded. No software install needed.

Does OFF store units and colors?

Units: no. Colors/materials: optional vertex colors. Geometry is stored as polygon mesh.

How do I convert OFF to STL?

Use the free OFF to STL converter: drop the file, press Convert, download. Everything runs locally in your browser — no upload, no signup.

What is OFF best used for?

Research, teaching and mesh-processing pipelines.

What does OFF leave out?

OFF describes polygon geometry with unitless coordinates and optional vertex colors. It has no standard assembly hierarchy, textures, materials or animation tracks.

Can OFF store animation?

No. OFF is used for research & geometry processing, and its format does not carry animation tracks.