3D Model Compressor (GLTF/GLB)

GLTF (GL Transmission Format) is the standard 3D model format for web delivery — often called the "JPEG of 3D." GLTF files come in two variants: .gltf (JSON + separate binary files) and .glb (single binary container with embedded JSON and geometry). GLTF/GLB compression reduces file size by removing unnecessary metadata that 3D modeling tools embed during export — including editor extras, copyright strings, generator information, node names, and unused extension data. Our GLTF/GLB compressoralso minifies the JSON portion of the file, which can represent 10–40% of a typical GLTF file's total size for metadata-heavy exports from Blender, Maya, and Cinema 4D.

1. Upload your GLTF or GLB file: Drag and drop or click to browse. Our GLTF/GLB compressor accepts both .gltf (JSON) and .glb (binary container) files. Your 3D model never leaves your browser — all processing is 100% client-side and private.
2. Configure compression options: Choose which metadata to remove — extras fields, asset metadata (copyright, generator), node/mesh/material names, and unused extensions. Enable JSON minification to remove all whitespace from the JSON portion. For GLB files, the binary geometry chunk is preserved unchanged.
3. Download the compressed model:Click "Compress 3D Model" to process the file and see exact byte savings, plus a full model analysis showing mesh count, primitive count, material count, texture count, and all extensions. Download the compressed file as a drop-in replacement for the original.

• Extras Fields: The extras object is an optional field in GLTF that tools use to store custom metadata — Blender stores object properties here, Maya stores custom attributes, and various exporters add debug information. These are safe to remove for web delivery.
• Asset Metadata: The asset.copyright and asset.generator fields identify the tool that created the file (e.g. "Blender 4.0.0 GLTF 2.0 exporter"). These add bytes without affecting rendering.
• Node and Mesh Names: Name strings on nodes, meshes, materials, and accessors are used for debugging but not required for rendering. Removing them reduces JSON size, especially for models with many named objects.
• Unused Extensions:GLTF extensions add features like unlit materials, mesh quantization, and GPU instancing. Extensions not needed for your target platform can be removed to reduce JSON overhead and improve compatibility with renderers that don't support them.

This GLTF/GLB compressor modifies the JSON metadata portion of the file only — binary geometry data (vertex buffers, index buffers, texture data) in GLB files is preserved unchanged. For maximum compression, use Draco geometry compression in your 3D modeling software (Blender's GLTF exporter supports Draco) or the gltf-pipeline CLI tool before uploading. Always test compressed models in your target renderer before deploying to production — some renderers require specific extensions or name fields for animation rigging and scene graph traversal.