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OBJ Vertex Compression

Reduce polygon count and keep OBJ output.

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About This Tool

Geometry simplification for OBJ. Meshopt/Draco do not apply (glTF-only). Output remains OBJ (with MTL/textures when present). Local processing.

Tips

  • 1Output stays OBJ
  • 2No Draco, simplification only
  • 3Upload MTL and textures together when needed.

About Configuration Options

Vertex / Geometry

Mesh Simplification

Default50%

Range0% – 100% · step 5%

Reduces the number of faces and vertices using mesh simplification. Default medium strength; increasing strength shrinks file size further but may lose surface detail. Only affects geometric density, not the container format.

Format Information

Input / Output

Extension:
obj
Full Name:
Wavefront OBJ
Type:
3D Model
Format:
OBJ
Tools:
Blender、Maya、3ds Max
Open With:
3D Model Viewer、OBJ Viewer
Description:
OBJ is an open 3D geometry format introduced by Wavefront in the 1980s. It uses human-readable text to record vertices, normals, UV coordinates, and face connections, and is supported by nearly all 3D software, making it a safe choice for cross-software mesh exchange. Materials and textures are usually defined in an accompanying .mtl file, which must be placed in the same directory. OBJ does not contain animation or skeleton data, only static meshes. It is not suitable as a final format for character animation workflows. Additionally, the text encoding makes large model files bulky and complex scenes load slowly. For single-file delivery with embedded textures, GLB is a better option.

Notes:

  • MTL file must stay with OBJ file for materials
  • No support for animation or skeletons

Supported Features:

  • Human-readable text format
  • Separate geometry (.obj) and material (.mtl) files
  • Universal software support
  • UV coordinates and normal preservation

How to Use

1

Upload Model

Drop OBJ and optional MTL/textures

2

Configure Settings

Adjust simplification strength

3

Compress & Download

Download optimized OBJ package

Frequently Asked Questions

View all FAQs
Q

Is the download still OBJ?

A

Yes, the result stays OBJ (packaged as a ZIP when MTL and textures are present), not converted to GLB. Geometry is simplified in place so the OBJ pipeline and downstream tools keep working.

Q

Why is OBJ limited to mesh simplification?

A

Meshopt and Draco are glTF container extensions, so they don't apply to OBJ. OBJ compression relies on mesh simplification only; combined with the smaller vertex/face data, dense OBJ files still shrink noticeably.

Q

Can an OBJ with MTL and textures be compressed?

A

Yes. The geometry is simplified while MTL, textures, UVs, and materials remain unchanged, and the output is an OBJ package (ZIP). Upload the MTL and textures together so references resolve correctly.

Q

Can the OBJ text format itself be compressed?

A

OBJ is a text format whose size comes mainly from vertex and face data. Reducing the number of faces is the direct and effective way to shrink it: the output is an optimized OBJ or ZIP package, still in text form.

Q

Will compression affect visual quality?

A

Lower intensity keeps more detail at the cost of a larger file; higher intensity removes more faces and can flatten curves. Use the real-time preview to compare before and after: dense sculpts tolerate stronger decimation before silhouettes degrade.

Q

Will UV coordinates and textures stay mapped?

A

Yes. Simplification changes topology but keeps the UV coordinates of the remaining faces, so the existing MTL and textures continue to wrap correctly. Spot-check UV seams and stretched areas in the preview.

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