Turn a self-contained glTF 2.0 model into an STL triangle mesh for a slicer or another mesh-based workflow. Inspect the preview and verification results before deciding whether to purchase the full-quality STL.
What this GLB and GLTF converter does
GLB and GLTF are two common ways to package glTF 2.0 scenes. A GLB file is a binary container. A .gltf file is a JSON document that may refer to separate buffers and images. This converter accepts one uploaded file, reads its triangle geometry and node transforms, combines the scene geometry, and writes an STL surface mesh. Supported models must be self-contained: a .gltf file that depends on separate .bin or image sidecars is rejected rather than processed with missing resources.
The tool is intended for converting existing mesh geometry, not for repairing a damaged model or rebuilding CAD. It preserves supported triangle surfaces and their placed coordinates. It does not create smooth CAD faces, parametric features, a design history, or a guarantee that the model is ready to print.
Upload one supported model
Choose a .glb or .gltf file up to 25MB. The document must be glTF 2.0 and must not request external files. The processing limit is 250,000 triangles across the loaded scene, including repeated mesh instances. A file can meet the byte limit and still exceed the geometry limit; in that case processing stops and you are not charged.
The server reads the scene's mesh nodes and applies their transforms before writing the STL. A model containing multiple mesh objects is combined into one geometry file. This makes a single STL convenient to pass to a slicer, but it does not preserve the original object names, hierarchy, animation, camera, or other scene organization. Check the resulting model carefully if separate objects need to remain independently selectable.
Preview and verification before checkout
After a successful conversion, orbit and zoom around a reduced-detail preview. Use the dimensions and triangle count as checks on overall scale and geometry. The preview is generated from the saved STL after it has been reopened, not directly from the conversion's temporary in-memory mesh. A separate quality check also opens the saved output and compares its measurable geometry with the uploaded source.
Read the verification checklist and any warnings before paying. It reports whether the output is present, has the expected STL format, can be loaded independently, and remains within the checks relevant to the source. If a check fails, the download is not offered. Passing these checks means the saved file could be read and measured; it is not a certificate of dimensional accuracy, printability, or suitability for a particular machine.
What STL keeps and what it drops
STL describes a surface using triangular facets. It does not carry glTF materials, textures, vertex colors, animation, cameras, lights, or node names as STL data. A colored or textured GLB can therefore look different after conversion even when the surface shape is present. Keep the original model and any related assets if appearance or scene structure matters.
STL files generally do not declare a reliable unit system. The converter carries the numeric coordinates into the output, but another application may interpret those values using its own import defaults. Check a known dimension in the slicer or mesh editor and set the intended units before manufacturing.
Price, privacy, and file limits
The preview is free. If the result is right, a one-time $2.99 Paddle checkout unlocks the full-quality STL; there is no account or subscription. Uploading or inspecting the preview does not charge you. Unpaid files are deleted within 60 minutes. Paid files remain available for re-download for up to seven days unless deleted sooner.
The uploaded model is sent to the server for conversion and independent verification, so this is not a local-only viewer. Do not upload a confidential design unless you are authorized to use this service and accept the stated file handling. If the source is oversized, malformed, relies on external resources, contains unsupported geometry, or exceeds the triangle cap, it may be declined without charge.
Check the STL in its destination application
Open the downloaded STL in the software that will use it. Confirm that the part is oriented as expected, measure a known feature, and inspect thin walls, separate components, and small details at full output resolution. Run the slicer's own analysis and layer preview before printing; visual inspection in a browser cannot reveal every issue that affects a build.
If you need to change scale, position, or orientation, use an appropriate mesh editor and save a new copy. If you need to modify engineering features or preserve materials and animation, return to the source CAD or 3D authoring project. Converting formats should not replace keeping an editable source.
Frequently asked questions
Can I convert a GLB file to STL online?
Yes. Upload a self-contained glTF 2.0 .glb or .gltf file within the 25MB and 250,000-triangle limits, inspect the preview, then pay $2.99 once for the full-quality STL.
Does this accept GLTF files that need a .bin sidecar?
No. The single-file upload supports only self-contained GLB/GLTF files. External buffer and image files are rejected.
Will the STL preserve GLB colors, textures, or animation?
No. STL carries triangle geometry only; glTF appearance data, animation, cameras and scene hierarchy are not retained.
How much does GLB to STL cost?
The preview is free. The full-quality STL costs $2.99 as a one-time payment.
Does a verified STL guarantee it will print?
No. Verification checks that the saved output opens and passes measurable geometry checks. Review it in your slicer and use its own analysis before printing.