LOD Generator: Reduce Polygons Without Destroying UVs
Generate game-ready LODs from a .glb or .gltf, preview the popping, export each level. Free, instant, no sign-up.
100% in your browser: your files never leave your device
Drop a .glb or .gltf file here
or click to choose. For a .gltf with separate files, select the .bin and textures too.
Files up to about 100 MB work best on a desktop browser. Simplification runs on your machine, so larger files need more memory.
What this LOD generator does
This tool takes a GLB or glTF model and produces lighter versions of it: LOD1, LOD2 and LOD3, each with a triangle target you set. It is the pipeline we use on iMeshh's own asset library, turned into a free page. The polygon reducer is the meshopt simplifier, the same engine inside gltfpack, running as WebAssembly in your browser. Load a model, pick your levels, generate, and compare the results in the same viewport before you export anything.
Reducing polygons without losing UVs
The usual failure mode of polygon reduction is texture damage. Blender's Decimate and most quick reducers treat the mesh as bare geometry, collapse edges across UV seams, and the texture smears. This tool runs attribute-aware simplification instead: UVs and normals are weighted in the error metric alongside position, so the simplifier prefers collapses that keep the mapping intact. Border locking is on by default, which keeps the outer edges of the mesh (and anything that must line up with neighbouring parts) exactly where they were. An error limit, 1% by default, stops the simplifier before it trades too much shape for triangle count.
See the popping before you ship it
LOD switches are invisible in a results table and painfully visible in a running scene. The popping preview switches the displayed LOD by the model's projected screen coverage, the same way game engines do: zoom out and watch LOD1 and LOD2 take over at the thresholds you set. If a switch pops, you will see it here first and can raise the threshold or the triangle budget before it reaches your engine.
Your files never leave your browser
There is no upload. The model is read in memory on your machine, simplified on your machine, and the GLB exports are generated on your machine. Nothing is stored and nothing is sent over the network, so it is safe for client work and unreleased assets. Close the tab and the file is gone.
Common questions
What is a LOD and why do I need one?
LOD stands for level of detail: the same model at several triangle counts. Game engines and real-time viewers swap to a lighter LOD as the model gets smaller on screen, which keeps frame rates high without a visible quality loss. Most pipelines want two or three levels, roughly halving the triangle count each step.
Why do UVs break in other polygon reducers?
Classic decimation only looks at the shape, so it happily collapses edges across UV seams and texture boundaries. The result looks fine as a silhouette but the textures smear or tear. This tool uses attribute-aware simplification: UV and normal differences are part of the error metric, so collapses that would damage the mapping are avoided first.
What can I export?
Each generated level downloads as a standalone GLB with materials and textures included, named LOD1, LOD2 and so on, plus a zip with all levels. Exports are uncompressed for maximum compatibility; run them through gltfpack or glTF-Transform afterwards if you want web-optimised files.
Works with exports from Blender, SketchUp, 3ds Max, Maya and Cinema 4D, with .glb downloads from Sketchfab and other asset libraries, with AI-generated models, and with DRACO, meshopt or KTX2 compressed files.
Want to inspect a model first? Open it in the free GLB & glTF viewer.
Need it for 3D printing instead? Convert it with the free GLB to STL converter.
Building with glTF?
iMeshh's asset library includes hundreds of optimised glTF models alongside 2,500+ Blender-native assets: furniture, materials and full scenes, made by archviz professionals.
Browse the asset library