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Convert STEP to OBJ Online: STP to Mesh Output

Convert STEP/STP models to an OBJ triangle mesh. OBJ does not declare reliable units, and the mesh is not an editable CAD solid.

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Capabilities and limits

  • Convert STEP/STP models to an OBJ triangle mesh. OBJ does not declare reliable units, and the mesh is not an editable CAD solid.
  • Conversion preserves supported geometry rather than native parametric feature history; verify output units, completeness and geometry.
  • Files are uploaded for server processing; support depends on format, version and geometry.
  • Viewing and measuring do not require an account. Free conversion points are valid for 90 days. Sign in to convert, save files across devices or create share links.
On this page

Convert STEP or STP geometry to OBJ when the next tool wants a triangle mesh. The output approximates surfaces with triangles and does not keep the CAD feature tree.

Inspect the STEP model first

Confirm the expected bodies and one known dimension before converting. A mesh made from the wrong scale or the wrong revision will look complete and still be unusable.

Convert STEP to an OBJ mesh

Choose OBJ and download the mesh. Curves become triangles. The OBJ file does not declare a reliable unit, and CADProps treats OBJ coordinates as millimetres when you measure it here.

Check scale after conversion

Reopen the OBJ and compare a known size. Mesh area and volume are approximate, and volume requires a closed, consistent mesh. The conversion does not restore a precise CAD solid.

Input formats: STEP / STP

Points: viewing and measuring are free. A new account gets 3 free conversion points; free points are valid for 90 days. One point converts one file to every output format for 30 days, and a failed or incomplete conversion uses none. See pricing.

Open this tool

General steps for uploading, viewing, sectioning, measuring, converting and exporting are explained once in How it works. This page covers what is specific to this file type.

Real CADProps screenshots

The screenshots show the English interface. Captions and instructions describe the same operations.

Convert CAD files — block.step
Convert CAD files — block.step

Sample source and verification

Properties — step-to-obj.zip · 40 × 30 × 20 mm · 24,000 mm³ · 5,200 mm²
Properties — step-to-obj.zip · 40 × 30 × 20 mm · 24,000 mm³ · 5,200 mm²

When a result needs another check

Viewing can start without an account. Conversion, account storage and share creation require signing in. Temporary files expire after the displayed retention period. Read the privacy statement for server processing and deletion, and the accuracy notes before using numerical results. Do not assume that hiding a part, clipping it or exploding an assembly changes the exported source geometry.

When a result needs another check · Input formats

Continue with a related task

Original article: CADProps · https://www.cadprops.com/tools/step-to-obj/

A reproducible example

Convert the generated 20 × 30 × 40 mm STEP block to OBJ. Compare the mesh bounding box with the source; OBJ volume remains an approximate closed-mesh result.

Repository-generated samples are synthetic test models. Verify your own model's units and geometry before using results.

Supported formats
All formats and limits →

Questions about this task

Can I convert STEP to OBJ online?

Yes. Upload a STEP or STP file, choose OBJ and download the triangle mesh.

Does OBJ keep the units from the STEP file?

No. OBJ does not declare a reliable unit. When CADProps measures an OBJ file, it treats the coordinates as millimetres. Verify a known dimension in the receiving application.

Is the OBJ file still a CAD solid?

No. It is a triangle mesh. It does not keep the STEP feature tree, and it cannot be treated as an exact solid.

Do I need an account to convert files?

View and measure without an account. Register or sign in to convert, save files and create share links. Recipients can view shared models without an account.

Related reading

Checks that help with this file.

All guides →
Opening files

STEP File (.step, .stp): What It Is and How to Open It

A STEP file is a neutral ISO 10303 CAD model saved as plain text. See what it contains, how to open a .step or .stp file online, and what to check first.

Read the guide →Measurement

OBJ Mesh Units and Volume: Check Scale and a Closed Shell

OBJ does not declare reliable units. See how millimetres are assumed, when mesh volume is only an approximation, and why OBJ is not a CAD solid.

Read the guide →File formats

STEP vs STL: CAD Measurement, Geometry and Accuracy

STEP and STL serve different jobs. Learn what changes when surfaces become triangles and which checks belong in a CAD handoff.

Read the guide →Conversion

CAD File Conversion Checklist: Units, Solids & Accuracy

Reopen the output, verify scope and units, inspect critical geometry, and include a short record of what was and was not checked.

Read the guide →