3D printing & STL tools
Shrink an STL, turn flat art into a printable model, and check a mesh before it reaches the slicer.
Slicers choke on the same three things: a mesh with far more triangles than the nozzle can resolve, a file that is technically valid but not watertight, and a format the printer's firmware does not read. These tools cover all three, in the browser, without installing a mesh editor. Nothing here re-topologises your model for you — the point is to get a file that slices cleanly and uploads without a size limit in the way.
Start here
STL Size ReducerShrink an STL to a target MBOpenWhich one do I need?
- The file is too big to upload or slice
- Use the STL Size Reducer. It decimates the mesh towards a size you name in megabytes, so a 180 MB scan becomes something a print service will accept while the silhouette stays where it was.
- You have artwork, not a model
- PNG / SVG to STL extrudes a flat graphic into a solid: logos, name plates, cookie cutters, keychain tags. QR Code to STL does the same for a scannable code and emits 3MF as well, so colour-change layers survive.
- You need to look at it, or hand it over in another format
- The 3D Viewer opens STL, OBJ, GLB, 3MF and PLY without uploading them anywhere, and the 3D Model Converter moves between those formats when a slicer, a marketplace or a client insists on one of them.
The rest of the set
Also useful
Guides
See all 8 guidesHow to Convert PNG Logos to STL for 3D Printing
A technical, step-by-step workflow to turn a crisp PNG logo into a clean STL: alpha handling, real-world scaling, thickness, and print-ready slicer tips.
Apr 14, 2026 · 12 min
Optimizing Polygon Count for Better Print Quality
Learn how polygon density affects slicing time and surface quality — and how to tune your 2D input so the resulting STL is efficient and print-ready.
Apr 12, 2026 · 14 min
Understanding Mesh Generation from 2D Assets
A technical overview of how a 2D PNG/SVG becomes a 3D triangle mesh: sampling, contours, triangulation, normals, watertightness, and STL output constraints.
Apr 11, 2026 · 22 min
Preparing a High-Contrast Height Map for STL
Turn grayscale artwork into predictable relief geometry. Learn contrast control, smoothing, and how to avoid banding and micro-noise before converting to STL.
Apr 10, 2026 · 19 min
Fixing Common STL Issues: Non-Manifold Edges and Holes
A troubleshooting guide for slicer warnings and broken meshes: what non-manifold means, how holes form, and how to fix them at the source or with downstream repair tools.
Apr 09, 2026 · 17 min
Scaling and Thickness: Getting Real-World Dimensions in STL
How to set width/height in millimeters, keep aspect ratio correct, pick a print-safe thickness, and validate dimensions before slicing.
Apr 07, 2026 · 18 min
How to reduce STL file size without ruining the print
Why STL files get large, how to read the triangle count straight from the file size, and what binary, re-export, decimation and 3MF each save in practice.
Sep 18, 2026 · 5 min
STL vs 3MF vs OBJ: picking the right 3D file format
What each format really stores, how many bytes the same mesh costs in all three, why units decide most arguments, and the edge cases that break silently.
Sep 18, 2026 · 7 min