Any file up to 500 MB. Drop several files and they come back as one ZIP. Many image, audio and video conversions run in your browser; anything else is uploaded and removed within the hour.
Convert your STL 3D models to GLTF format instantly to enable modern web rendering and AR/VR integration. This tool is essential for developers and designers who need to move from static geometry to web-optimized 3D assets.
STL files are widely used for 3D printing, representing surface geometry using a simple triangular mesh without color or texture data. In contrast, GLTF (GL Transmission Format) is designed as a 'JPEG of 3D,' acting as a highly efficient, runtime-ready format for web browsers and mobile applications. Converting STL to GLTF involves wrapping the existing geometry data into a JSON-based structure that supports modern rendering pipelines, allowing your models to be displayed interactively on websites.
The conversion process is entirely lossless; the geometric precision of your STL mesh is preserved perfectly within the GLTF file.
We built this project so anyone can convert files without paywalls, accounts, or hidden limits. Here is what that promise means in practice.
Every converter on ConvertX is free to use: no trials, no premium tiers, and no credit packs. We will never put core conversion features behind a subscription. Whether you convert one photo or a hundred files a week, the price stays zero.
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.
A quick guide to strengths and trade-offs of popular formats — so you pick the right one before converting.
Meshes and scenes for 3D printing, games, and CAD.
Common extensions: OBJ, STL, GLTF, GLB, FBX, PLY
Raster and vector graphics for web, print, and photography.
Common extensions: PNG, JPG, WebP, AVIF, GIF, SVG, HEIC, TIFF
Office files, PDFs, ebooks, and plain text.
Common extensions: PDF, DOCX, XLSX, PPTX, ODT, EPUB, TXT
Clips, streams, screen recordings, and movies.
Common extensions: MP4, WebM, MOV, MKV, AVI, MPEG
