Free online TXT to STL converter

A 3D printer or slicer may require an STL model when geometry is stored in a TXT file. A broadcaster may instead require an EBU STL subtitle file, which is unrelated to the 3D format and requires timed subtitle data.

What TXT contains

TXT is a plain-text container, not a defined 3D or subtitle format. It may contain ordinary writing, subtitle lines, point coordinates, mesh vertices and faces, or source code for a modeling application.

Open the file in a text editor or code editor before converting it. Lines such as 12.4 8.1 0.0 may be XYZ points; vertex and face indexes may describe a mesh; OpenSCAD commands such as cube() and difference() should be saved as .scad. Ordinary prose contains no geometry and cannot produce a meaningful solid without modeling information. Subtitle text also needs timecodes, such as start and end times, before it can be exported to a timed subtitle format.

Which STL format do you need?

3D STL stores a surface as triangular facets and is accepted by most slicers, mesh editors, and rapid-prototyping systems. It can be ASCII text or binary data; binary STL is usually smaller and faster to load. STL does not store units, colors, materials, object names, or parametric CAD history.

EBU STL is the EBU Subtitling Data Exchange Format, commonly used for broadcast subtitle interchange. It is not a 3D mesh, even though it uses the same .stl extension. A TXT file containing untimed dialogue cannot be converted correctly until subtitle timing, formatting, language, and other required metadata are supplied.

Convert TXT geometry to 3D STL

Point coordinates

1. Open the file in MeshLab or CloudCompare. If the application does not recognize the .txt extension, copy the file to a working file with a suitable extension such as .xyz, or select an all-files option.
2. Set the delimiter and column mapping in the import dialog. Confirm whether the columns are X, Y, Z, and remove headers or extra columns containing IDs, colors, or measurements.
3. Check the point cloud's orientation, units, scale, and density. Swapped columns exchange axes; sparse or noisy samples cannot define an accurate surface.
4. In MeshLab, use its surface-reconstruction filter, such as Poisson or Screened Poisson reconstruction, and adjust the reconstruction depth and normal settings. Reconstruction creates an inferred surface rather than recovering unavailable geometry.
5. Inspect the mesh and choose File → Export Mesh As, then select .stl. Choose binary STL unless an ASCII file is specifically required.

Vertices and faces

Use Blender, FreeCAD, or a custom script only when the TXT schema explicitly defines vertices and face connectivity. Parse the coordinates, create the mesh from the listed faces, and check normals, holes, self-intersections, and non-manifold edges before exporting through File → Export → STL or the equivalent command.

A generic importer cannot determine whether a number represents a vertex, face index, dimension, or metadata. A Python workflow using trimesh can export the parsed vertex and face arrays, but the parser must apply the correct units and indexing convention; face indexes may start at zero or one.

OpenSCAD source stored as TXT

1. Rename model.txt to model.scad only if its contents are valid OpenSCAD source.
2. Open it in OpenSCAD, render the model with Design → Render, and correct any missing variables or included files.
3. Use File → Export → Export as STL.

This is an extension correction, not a conversion of arbitrary text.

TXT that already contains ASCII STL

If the file has a valid structure containing solid, facet normal, outer loop, and endsolid, rename it to model.stl or open it in MeshLab and export it again as binary STL. Validate the complete file rather than relying only on the first word, because some non-STL text also begins with solid.

Convert subtitle TXT to EBU STL

Use a subtitle or broadcast application that explicitly supports EBU STL export, such as SoftNI Subtitler Suite. Import the timed subtitle file, map the timecode rate and character encoding, set language and transmission parameters, check line lengths and display durations, then export through the program's EBU STL command. An untimed transcript must first be synchronized; renaming it to .stl does not create a valid EBU file.

Quality and compatibility checks

• 3D STL has no unit field. Set the same unit in the source application and slicer; interpreting millimeters as inches can make a model 25.4 times too large.
• A printable mesh normally needs a closed, non-self-intersecting, manifold surface with consistent normals. Use MeshLab, Blender, FreeCAD, or the slicer's repair tools to fix holes, duplicate faces, and inverted triangles.
• Point-cloud reconstruction depends on sampling density, noise, normals, and filter settings. Measure the exported model when dimensional accuracy matters.
• Online converters are unsuitable for arbitrary TXT because they cannot infer a schema or invent missing geometry. Use an online service only when it explicitly documents the exact XYZ, CSV, mesh, or subtitle input structure and required output variant; do not upload confidential scans, CAD data, or broadcast material.