Convert binary STL files to human-readable ASCII STL. Diff models, version-control geometry, or debug malformed meshes. Browser-based.
Upload a binary STL file
STLLoader parses the binary triangle records
Download the ASCII STL — readable in any text editor
0 bytes uploaded. STL Binary → ASCII Converter runs entirely in your browser using three.js and WebGL. Your meshes never leave your device.
ASCII STL is human-readable and diff-friendly. Useful for debugging mesh issues, version control with semantic diffs, or sharing geometry as a code artifact.
Roughly 5× larger than binary. A 10 MB binary STL becomes ~50 MB as ASCII.
Yes — most slicers parse binary STL much faster. Use ASCII only for inspection and convert back to binary before printing.
Convert ASCII STL files to compact binary STL — typically 5× smaller. Faster to load, cheaper to store. 100% browser-based, no upload.
Open toolReveal the 80-byte STL header, GLB JSON chunk, software origin, vertex/face stats, and authoring tool from any 3D file. Browser-based, zero upload.
Open toolConvert STL meshes to Wavefront OBJ in your browser. Open the result in Blender, Maya, Cinema 4D, or any 3D tool. Privacy-first — zero upload.
Open tool