3D Model Resizer

Drop a 3D model, choose a uniform scale factor or a target maximum dimension, and this tool resizes the mesh accordingly and re-exports it as a binary .glb file. Useful for matching a real-world size before 3D printing, or fitting a model into a game or AR scene's expected scale. Everything runs locally with three.js; the model is never uploaded.

PrivateFreeWorks offline

Reviewed by Vincenzo Manto, Founder & Lead Developer · Last updated October 4, 2026

How it works

  1. 1

    Drop or select a 3D model in any supported format.

  2. 2

    Choose either a scale factor (e.g. 2x) or a target maximum dimension in model units.

  3. 3

    The tool scales the mesh uniformly and recomputes its bounding box.

  4. 4

    Preview the before/after size and download the resized .glb.

Two ways to think about size

Sometimes you know the exact multiplier you need (scale factor); other times you know the real limit you must fit within, like a printer bed or a game asset's expected footprint (target max dimension). This tool supports both without requiring you to do the math yourself.

A quick fix before printing or importing

A model downloaded from one source often isn't scaled to match your printer, engine or scene. Instead of reopening it in a full 3D suite just to resize it, this tool handles the scale and re-export in one step, in the browser.

Frequently asked questions

Does this scale uniformly on all axes?

Yes, the same factor is applied to X, Y and Z so proportions stay correct. There's no separate per-axis stretching.

What unit does 'target max dimension' use?

Whatever unit the source model already uses, often meters for GLB/GLTF or millimeters for STL from a 3D-printing tool. The tool scales relative to the model's own existing bounding box; it doesn't know real-world units on its own.

Why would I need to resize a 3D model?

Common reasons include making an STL fit your 3D printer's build volume, matching a GLB's scale to a game engine's unit system, or normalizing differently-scaled assets from multiple sources.

Is my 3D model uploaded anywhere?

No. Parsing, scaling and exporting happen in your browser using three.js, so the file never leaves your device.

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