Simplify Mesh Online

Decimify is a free, browser-based tool for reducing polygon count in 3D meshes — no install, no sign-up, and your model never leaves your device.

Drop a GLB or STL file. Drag the slider. Download the simplified result as GLB, STL, or USDZ.

Open the Tool →

What It Solves

Polygon reduction is the problem 3D workflows hit every day:

• Game engines and real-time renderers need models under a triangle budget.
• Web 3D and AR (glTF, USDZ) load faster with fewer polygons.
• 3D printing slicers choke on dense photogrammetry scans.
• Asset libraries want LOD variants for streaming and distance culling.

Decimify reduces polygon count while keeping UV seams and material boundaries clean — no tearing, no stretching, no flattened creases.

Supported Formats

Format	Materials	UVs	Notes
GLB (glTF)	Preserved	Preserved	Recommended. Single file with geometry, materials, and textures.
STL	—	—	Geometry only. Best for 3D printing.
USDZ	Preserved	Preserved	Export only. Apple AR Quick Look compatible.

For any other format, convert to GLB first using Blender (File → Export → glTF Binary).

How It Works

1. Upload. Drop a file onto the tool or click to browse. Your file is parsed in-browser.
2. Simplify. Drag the slider to reduce face count. The preview updates in real time — the whole LOD pyramid is computed once, then scrubbed without a rebuild.
3. Download. Export as GLB (with textures), STL, or USDZ.

Why It's Different

Real-time slider. The whole LOD range is pre-computed once — moving the slider shows each level instantly, no rebuild, no waiting.

Attributes stay intact. UV seams, normals, and material boundaries are preserved through every reduction level. Textures don't tear, shading creases don't soften.

Runs off the main thread. Built on WebAssembly and a background worker so the UI stays responsive even on million-triangle models.

Private by design. No upload. No account. No analytics. Read the privacy policy.

Typical Uses

• Reducing a photogrammetry scan before 3D printing.
• Generating LODs for a Three.js or Babylon.js scene.
• Baking a USDZ for AR Quick Look.
• Shaving file size off a glTF before uploading to Sketchfab or a model viewer.
• Hitting a polycount budget for a game asset without reopening Blender.

Pricing

The tool is free. Premium unlocks full simplification power — see Upgrade Plan.

If you work inside SketchUp, there's a dedicated plugin that simplifies geometry in place while keeping groups, components, and soft edges intact — see Simplify Mesh in SketchUp.

Open the Tool →