Reduce mesh and STL file size

Cut the triangle count of a 3D model, preview the result in an interactive viewer, and export a much smaller STL, OBJ, PLY, GLB or 3MF.

Drop a mesh or CAD file hereor click to browse — nothing leaves your browser

STL · OBJ · PLY · GLB · 3MF · STEP · IGES

Keep 50% of the detail

Export as

How it works

Load your model. Mesh formats load directly; STEP and IGES are tessellated by the built-in CAD kernel first.
Choose how much detail to keep. The slider sets the target; the viewer shows exactly what survives.
Export. Download the smaller file in whichever mesh format you need.

Why meshes get too big

A 3D scan can arrive with several million triangles describing detail no printer or browser will ever reproduce. CAD exports have the same problem in reverse: set the tessellation too fine and a simple bracket becomes a 200 MB STL.

What simplification actually does

The algorithm repeatedly collapses the edge whose removal changes the surface least, until the target count is reached. Flat regions lose vertices first — that is why a model with large planar faces can shrink dramatically with no visible change, while a highly curved organic shape degrades sooner.

When not to simplify

If the model came from CAD and you still have the STEP file, re-export it instead with a coarser setting — see tessellation quality explained. Regenerating from exact geometry always beats decimating an approximation. Use STEP to STL with the Draft or Normal preset.

Good candidates

Photogrammetry output, downloaded models destined for the web, sculpts headed for a game engine, and any mesh that makes your slicer or viewer stutter. Preview the result in the 3D viewer before committing.

Frequently asked questions

How much can I reduce a mesh without it looking wrong?

Scans and sculpts often survive an 80–90% reduction with no visible difference. Mechanical parts from CAD are less forgiving: their detail is concentrated in a few curved faces, so start around 50% and inspect the silhouette.

Will the simplified file still print correctly?

Usually yes, but check curved surfaces and small features before printing. Simplification removes vertices, so holes can become polygonal and fillets can flatten. For CAD sources it is better to re-export at a coarser tessellation than to decimate.

Which formats can I export?

STL, OBJ, PLY, GLB and 3MF. Input can be any mesh format plus STEP and IGES, which are tessellated first.

Is my model uploaded?

No. Loading, simplification and export all happen in your browser — nothing is transmitted.

Can mesh simplification be reversed?

No. Decimation removes vertices and can soften sharp edges or break the watertightness a slicer needs. Keep the original model and inspect the simplified result before using it for printing or manufacturing.