OBJ is plain text, which makes it readable and enormous. Converting to a binary mesh format is a large, lossless win.
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80
Resize
50
Encoder detail
6
fastzopfli
256
28
0 lossless51 tiny
The largest saving available.
50
Speed, audio and advanced
8
0 smallest13 fastest
128
96
Advanced
8
Nearly all of the saving comes from the images inside.
150
75
Advanced
50
aggressivegentle
Advanced
14
coarsefine
0 merges only exactly equal vertices. A small value also closes hairline cracks left by CAD exporters.
Geometry only — texture coordinates,
materials and vertex colours are not carried through. Decimating a
UV-mapped mesh correctly is a much harder problem, and mangling your
UVs quietly would be worse than leaving them alone.
12
6
Advanced
ZIP and 7z. 7z encrypts the file list too.
What actually shrinks OBJ files
Writing the same geometry as binary PLY typically cuts the file by 70–80% with no change to the model.
Faces with more than three vertices are triangulated on read.
Materials, texture coordinates and normals are not carried through — this tool works on geometry.