A heavy GLB slows your site. Cut its size up to 90% with Draco, KTX2 textures and mesh decimation — with no visible quality loss.
To reduce a GLB file's size, target its two heaviest parts: geometry and textures. Draco compression shrinks meshes (often −50 to −90%), converting textures to KTX2 or WebP drastically cuts their weight, and decimation removes unnecessary polygons. Combined, these techniques take a GLB from tens of megabytes to a few megabytes, with no visible loss on screen — for a faster site and better Core Web Vitals.
A 40 or 80 MB GLB takes several seconds to load, especially on mobile or an average connection. The result: a degraded LCP, a higher bounce rate and a frustrating product experience. On an e-commerce page or a landing page, every megabyte counts. The goal isn't to hit an exact size, but the best trade-off between visual fidelity and loading speed for your use case.
Draco is Google's open-source library for compressing 3D meshes. Applied to a GLB, it cuts the geometry size by 50 to 90% depending on complexity, with negligible precision loss for visualization. Most exporters (Blender, gltf-transform) offer Draco as a single checkbox. The browser decompresses on the fly thanks to a lightweight decoder.
In most GLBs, textures are the heaviest part. Two levers: reduce resolution to the strict minimum (a 4K texture is rarely useful on the web; 1K or 2K is often enough) and change the format. WebP significantly shrinks images; KTX2 with Basis Universal compression goes further by staying compressed in GPU memory, which also improves rendering performance.
A model coming from CAD or a 3D scan often has far more polygons than the web needs. Decimation (Blender's Decimate modifier, or gltf-transform's weld/simplify) reduces the triangle count while preserving the silhouette. Mesh quantization brings vertex precision down from 32 to 16 bits, for an extra 30 to 50% gain. Combine it with Draco for an optimal result.
gltf-transform is the reference command-line tool for optimizing a GLB. In a single command, it applies Draco compression, texture conversion to WebP or KTX2, quantization and cleanup of unused data. It's the ideal way to wire optimization into an automated pipeline and guarantee consistently lightweight GLBs in production.
Once your GLB is lighter, upload it to OmniView 3D to test and share it. You get an interactive 3D viewer in under 60 seconds, accessible in any browser, on desktop or mobile. It's the fastest way to check that your optimized model loads quickly and stays faithful, then send it to a client or colleague via a simple link. Useful reminder: if a GLB embedded in a page slows your site, sharing it via a viewer link avoids weighing down the page itself.
Combine three techniques: Draco compression for the geometry, texture conversion to KTX2 or WebP at an appropriate resolution, and mesh decimation. Together they often cut the size by 80 to 90% with no visible loss on the web.
For web visualization, the loss is negligible: Draco compresses geometry with enough precision for the eye. For manufacturing or precise measurement, keep the original CAD file (STEP) instead.
WebP is simple and significantly shrinks the file. KTX2 (Basis Universal) goes further by staying compressed in GPU memory, which also improves rendering performance. For a demanding 3D site, KTX2 is the better choice.
Indirectly, yes. A light GLB speeds up loading, improves LCP and user experience — Core Web Vitals signals Google takes into account. To avoid weighing down the page, you can also share the model via a viewer link rather than embedding it directly.
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