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Reduce polygons without installing Blender

The Decimate modifier is the right tool if you are already in Blender. If you are not, you do not need to install a 3D suite to remove triangles from a file.

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Decimation is one operation. Blender is a full 3D suite that happens to contain it, and installing several hundred megabytes, learning where the modifier stack lives, and working out the import and export settings is a large amount of ceremony for one slider.

The algorithm itself is not proprietary to Blender. Quadric error decimation is a well-established method with several good open implementations, and one of them — meshoptimizer — compiles to WebAssembly and runs at full speed in a browser tab. That is what this page uses.

How to do it

Open the tool. Go to the reduce polygons page. There is nothing to install and no account to create.
Drop the file in. A .glb, .gltf or .fbx. It is read in the page — nothing is uploaded to a server, which is also why it keeps working if your connection drops after the page has loaded.
Set what fraction to keep. The tool shows the triangle count it found. Pick the fraction that gets you to the number you want, and do it in one pass rather than repeatedly halving — each pass measures error against the previous result rather than your original, so the silhouette degrades faster.
Download the GLB. The output carries UVs, textures, materials, vertex colours and skin weights. A rigged character comes out rigged.

Is it the same algorithm?

The same family, yes. Blender's Decimate modifier in Collapse mode and the meshoptimizer simplifier both implement quadric error metric decimation: each candidate edge collapse is scored by how far it would move the surface, the cheapest collapse is taken, and the process repeats until the target is met. The scoring details differ, but the results are comparable and neither is meaningfully "better" on ordinary assets.

Where they diverge is what surrounds the operation. Blender gives you the rest of Blender — you can inspect the result, mask regions, hand-fix a spot that decimated badly and continue working. A browser tool gives you the operation and a download. For most files that reach a decimator, the operation is all that was wanted.

What you give up by not using Blender

Selective control, mainly. In Blender you can weight-paint a vertex group to protect a face while aggressively simplifying a back that nobody sees. There is no equivalent here: the decimation is uniform across the mesh, guided only by the error metric.

You also give up the ability to fix what you do not like by hand. If a specific edge collapses in an ugly way, the browser answer is to keep more triangles overall rather than to repair that one place.

Neither limitation matters for the common case — an over-dense asset that needs to be a smaller over-dense asset. Both matter for a hero character being hand-optimized for a shipping title, and that is genuinely Blender's job.

The other things people install Blender for once

If decimation was your reason, several of its neighbours also have a browser equivalent here: converting an FBX to a GLB, welding vertices and filling holes, rebuilding topology as quads, re-unwrapping UVs and re-baking the maps, and exporting a print-ready STL.

This is not an argument against learning Blender, which is worth doing and is free. It is an argument against installing it at 11pm because a file needs one thing done to it.

Frequently asked questions

Can I reduce the polygon count of a model without any software?

Yes. A quadric error decimator compiled to WebAssembly runs at native-comparable speed in a browser tab, so the whole operation happens on your own machine with nothing installed and nothing uploaded.

Is an online polygon reducer as good as Blender's Decimate modifier?

For the operation itself, yes — the algorithms are the same family and produce comparable output. Blender is better when you need selective control, such as protecting one region while simplifying another, or hand-fixing a collapse you dislike.

Do I have to upload my model somewhere?

No. The decimation runs as WebAssembly inside the page. The file never leaves your machine, which also means there is no file-size limit imposed by a server and no privacy question about proprietary assets.

Will it keep my textures and my rig?

Yes. UVs, textures, materials, vertex colours and skin weights are carried through, and vertices bound to different bones are never merged — so a rigged character still animates correctly afterwards.

What formats does it accept?

GLB, GLTF and FBX go in; GLB comes out. GLB is the format that carries geometry, materials, textures and animation in a single file, and every major engine reads it.