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Reduce an STL to under 50 MB

50 MB is where printing services and slicers start to push back: Sculpteo stops there, Discord Nitro Basic does, and Cura and PrusaSlicer begin to lag on files past it. In binary STL it is about one million triangles, which is also the polygon cap at Sculpteo and Shapeways. The reducer opens here at 48 MB.

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Drop an STL file here or click to browse
Up to 300 MB · .stl only
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1
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2
Set target MB
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Download
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1 MB500 MB

We aim for exactly this size. Quality-preserving quadric decimation stops as soon as the file fits. If the mesh cannot be reduced further without breaking, we return the smallest safe result.

Pick an STL file to continue.
🔒 Files are processed on our server in isolated memory and removed within 15 minutes of your download.

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The limit: 50 MB

File size cap
50 MB
Triangle cap
no fixed cap
Triangles at that size
1.05 million

This page opens the reducer at 48 MB. Source: Sculpteo and Discord Nitro Basic limits (checked 2026-09).

Why the file is over it

One million triangles is roughly what a 0.05 mm scan of a hand-sized object produces after cleanup, and what AI generators emit at their highest settings. It is also about five times what a 0.2 mm FDM print can show on that object. Files above 50 MB are almost always carrying detail below the print resolution.

How to get under it

  1. 1Drop the STL below. The target is preset to 48 MB.
  2. 2Press Reduce. Repair runs first, then decimation stops the moment the file fits.
  3. 3Read the result card: triangles before and after, watertight before and after.
  4. 4Download.
Reduce to under 50 MB

What to expect

A 180 MB scan (3.8 million triangles) to 48 MB keeps one million: the same surface at print resolution, a quarter of the slicing time. Organic detail finer than 0.1 mm is where the change lives, and no desktop printer resolves it.

Other ways

PrusaSlicer's Simplify Model and Bambu Studio's Simplify do this inside the slicer with a detail slider and no byte target; you will export and check. MeshLab and Blender are the desktop equivalents.

Questions

Does under 50 MB guarantee under one million triangles?

For binary STL yes: one million triangles is 47.7 MB. For ASCII STL the triangle count is much lower at the same size; the reducer converts to binary anyway.

Will the slicer be faster?

Roughly in proportion to the triangle count. A four-fold reduction is typically a three- to four-fold faster load and slice.

Is 50 MB small enough for MakerWorld?

Yes, with room to spare: MakerWorld allows 150 MB per profile.