Free Online 3D Tools
Convert, View & Repair 3D Files

For traditional 3D models, Polyvia3D supports seven mesh formats with 42 conversion directions: OBJ, STL, GLB, PLY, 3DS, 3MF, and X (DirectX). For Gaussian Splatting (3DGS), we support four formats: PLY, SPLAT, KSPLAT, and SPZ with 12 conversion directions plus compression. 3MF support is currently in beta. More formats (FBX, USDZ, GLTF) are planned for future releases.

Yes, completely free with generous file size limits. For mesh files: Desktop up to 150MB, Mobile up to 25MB. For Gaussian Splatting files: Desktop up to 200MB for PLY and 100MB for compressed formats (SPZ, SPLAT, KSPLAT), Mobile up to 50MB. No hidden costs, no watermarks, no account required.

No. All conversions happen locally in your browser using WebAssembly (WASM) technology. Your files never leave your device. We don't receive, store, or transmit any user files. This is the core privacy advantage of Polyvia3D.

Yes. You retain all intellectual property rights to your files. Polyvia3D does not claim any ownership. However, ensure you have the right to use the source files (e.g., respect Creative Commons licenses on downloaded models).

No. Polyvia3D works entirely in your web browser. No downloads, no plugins, no account registration. Just visit the page and start converting.

Polyvia3D works on any modern browser that supports WebAssembly: Chrome 111+ (recommended), Firefox 128+, Safari 16.4+, Edge 111+. Internet Explorer is not supported.

Partially. Once the page and the conversion engine (WASM module) are cached, you can convert files without an internet connection. However, the initial page load requires internet access.

Geometry (vertices, faces) is preserved accurately in all conversions. However, some data may be lost depending on the format pair: converting to STL discards materials and textures, converting to STL or GLB may triangulate polygon faces, converting from GLB to OBJ/STL discards animations and scene hierarchy. Each tool page shows specific data loss warnings for the selected conversion direction.

3MF support is experimental. While most models convert correctly, some complex 3MF files (especially those with advanced print features) may not convert perfectly. If you encounter issues, try an alternative format like STL or OBJ for 3D printing workflows.

Most conversions complete in a few seconds. Processing happens entirely in your browser using WebAssembly, so speed depends on your device and file size. Larger files (10MB+) may take 10-30 seconds on slower devices.

STL is the most widely supported by slicers like Cura and PrusaSlicer. 3MF is a newer alternative that supports colors, materials, and print settings in a single file. Check our STL and 3MF format guides for a detailed comparison.

GLB is a single binary file containing the entire 3D scene, while glTF uses separate JSON, binary, and texture files. GLB is better for web delivery and sharing since everything is in one file. See our GLB vs glTF comparison for details.

Yes. Polyvia3D supports PLY, SPLAT, KSPLAT, and SPZ formats with 12 conversion directions. We also offer a 3DGS viewer for all four formats and a compressor that converts PLY or SPLAT to the compact SPZ format.

Some format features like materials, textures, and animations may not transfer between all formats. For example, STL only stores geometry. Mesh geometry (vertices and faces) is always preserved accurately. Each tool page shows specific data loss warnings for the selected conversion.