Browser Tool Converts GLB to STL for 3D Printing Without Uploading Files

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Developer Casey Marlin has built STL Mesh, a browser-based tool that converts GLB files — the standard export format from AI 3D generators like Meshy and Tripo — into STL files compatible with 3D printing slicers. Unlike most online converters, the tool processes files entirely on the client side using a Web Worker powered by three.js, meaning no data is sent to external servers. The converter handles GLB parsing, transform baking, and binary STL encoding, and also supports other format pairs including OBJ, FBX, SVG, and STL conversions. A key feature is a bounding box preview that helps users catch a common unit mismatch, since glTF files use meters while slicers interpret STL units as millimeters. The tool is freely available at stlmesh.com and requires no software installation.

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