3D models

OBJ → glTF

Learn about the formats: What is OBJ? What is GLTF?

Convert your legacy OBJ 3D models into the modern, web-optimized GLTF format. This conversion is essential for integrating 3D assets into real-time applications, web experiences, and AR/VR projects.

OBJ is a venerable text-based format primarily defining 3D geometry, often relying on separate MTL files for basic material properties and external images for textures. In contrast, GLTF (GL Transmission Format) is an efficient, binary-friendly standard designed for compact storage and fast loading of 3D scenes, supporting advanced features like PBR materials, animations, and scene graphs. The conversion process extracts geometry and texture data from OBJ and its associated MTL files, then maps these properties to the GLTF PBR material model, consolidating them into a single, easily deployable file.

Geometry and texture data are typically preserved with high fidelity. The primary consideration for quality lies in the translation of material properties from OBJ/MTL to GLTF's PBR model, which may require minor adjustments to achieve an identical visual appearance.

Tips

Ensure all associated MTL files and texture images are in the same directory as your OBJ file before upload for complete material transfer.
Verify the converted GLTF model in a GLTF viewer or editor to confirm material appearance, especially PBR properties.
For optimal web performance, consider converting to `.glb` (binary GLTF) as it's a single file and typically smaller.
Clean up any unused vertices or faces in your OBJ model beforehand to reduce the final GLTF file size.

Common use cases

Publishing 3D product models on e-commerce websites for interactive viewing in browsers.
Integrating architectural visualizations or game assets into web-based 3D engines like Three.js or Babylon.js.
Preparing 3D models for augmented reality (AR) applications on mobile devices.
Archiving legacy OBJ models in a future-proof, widely supported web format.

Why ConvertX stays free — forever

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Many image, audio, and video conversions run entirely in your browser. Your files never leave your device for those jobs. When server processing is required for documents or specialized formats, uploads are handled securely and removed automatically — typically within one hour.

File formats: what to choose

A quick guide to strengths and trade-offs of popular formats — so you pick the right one before converting.

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3D models

Meshes and scenes for 3D printing, games, and CAD.

Common extensions: OBJ, STL, GLTF, GLB, FBX, PLY

Advantages

+ STL is standard for 3D printing
+ GLTF/GLB is optimized for the web and AR
+ OBJ is widely supported in 3D software

Disadvantages

− File size grows quickly with detail
− Materials and animations may not transfer
− Some formats lack units or scale metadata

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Images

Raster and vector graphics for web, print, and photography.

Common extensions: PNG, JPG, WebP, AVIF, GIF, SVG, HEIC, TIFF

Advantages

+ WebP and AVIF offer excellent compression for the web
+ PNG keeps transparency and sharp edges
+ SVG scales without quality loss

Disadvantages

− RAW and TIFF files are large and slow to share
− JPEG loses quality on every re-save
− Some formats are not supported in older browsers

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Documents

Office files, PDFs, ebooks, and plain text.

Common extensions: PDF, DOCX, XLSX, PPTX, ODT, EPUB, TXT

Advantages

+ PDF locks layout for printing and sharing
+ DOCX and ODT are easy to edit collaboratively
+ Plain text works on any device

Disadvantages

− PDF is hard to edit without special tools
− Complex layouts may shift after conversion
− Scanned PDFs need OCR for editable text

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Video

Clips, streams, screen recordings, and movies.

Common extensions: MP4, WebM, MOV, MKV, AVI, MPEG

Advantages

+ MP4 (H.264/H.265) plays almost everywhere
+ WebM is efficient for web embedding
+ MKV can hold multiple audio and subtitle tracks

Disadvantages

− High-resolution video needs lots of storage and bandwidth
− Re-encoding always takes time and may reduce quality
− Some codecs require licensing for commercial use

Frequently asked questions

No, textures referenced in your OBJ's MTL file, if provided alongside the OBJ, will be embedded or linked within the GLTF file.

OBJ format itself does not natively support animations. If your OBJ was part of an animated scene in another software, the animation data would not be transferred via the OBJ file alone.

Our service typically converts one OBJ file to one GLTF file. For merging multiple models into a single scene, you would need a 3D editor after conversion.

GLTF is specifically designed for efficient transmission and loading of 3D scenes on the web, offering smaller file sizes, faster parsing, and native support for PBR materials and animations, which OBJ lacks.

Popular conversions