How can I open a SolidWorks file (.sldprt / .sldasm) without SolidWorks?

You can view these files for free using Autodesk Viewer or Dassault's official free eDrawings Viewer. If you need to edit or import them into other CAD platforms (like Fusion 360, Rhino, or Onshape), these platforms have built-in importers that convert them to their native geometries.

What is the best way to convert SLDPRT files to a universal format?

The industry standard is to export the file from SolidWorks as a STEP (.step) or Parasolid (.x_t) file, which preserves high-fidelity 3D solid geometry without design history.

3D Solid & B-Rep Standard8 verified tools

Software That Opens & Edits SLDPRT Files (8 Tools, 2026)

SLDPRT and SLDASM are the native, proprietary file formats used by Dassault Systèmes SolidWorks to store individual part files and multi-component assembly data. Since SolidWorks is the most widely adopted mechanical CAD program in the world, these formats contain critical feature-history trees, equations, assembly mates, and design parameters. Because they are native and proprietary, direct interoperability with other CAD kernels often requires translation, making them the most frequently searched formats for viewing and format conversion. Below are the tools in our database that support or convert SolidWorks files.

Full read & write support (2)

S
SolidWorksRead & Write
from $1295 · Windows · ★ 4.9
The de-facto industry standard for 3D parametric mechanical design.
DM
DesignSpark MechanicalRead & Write
Free · Windows · ★ 0.0
Free 3D CAD software for mechanical design with access to extensive component libraries and manufacturer support.

Read-only / viewers (6)

O
OnshapeRead Only
from $1500 · Web / iOS / Android · ★ 4.9
The professional CAD system built for agile cloud development.
F3
Fusion 360Read Only
from $85 · Windows / macOS / Android / iOS · ★ 4.8
The cloud-native powerhouse for integrated CAD, CAM, and CAE.
PC
PTC CreoRead Only
from $2430 · Windows · ★ 4.8
The original parametric 3D CAD powerhouse.
SN
Siemens NXRead Only
from $6000 · Windows / Linux · ★ 4.8
Powerful high-end CAD/CAM/CAE suite for advanced manufacturing.
AI
Autodesk InventorRead Only
from $315 · Windows · ★ 4.7
Professional-grade 3D mechanical design and simulation.
C
CATIARead Only
from $4500 · Windows · ★ 4.7
The high-end PLM standard for Aerospace and Automotive engineering.

SLDPRT SolidWorks Feature Tree Guidelines

Standard 1Parasolid Modeler Alignment: SLDPRT solids run natively on the Siemens Parasolid engine. Exporting as Parasolid format (.x_t) maintains perfect coordinate structure.

Standard 2Rebuild Sequence Rules: SolidWorks generates features sequentially. Place complex fillets and structural drafts at the end of the history tree to prevent rebuild breaks.

Standard 3Assembly Mate Caching: Large assemblies save local boundary representations in SLDASM. Lock external references to bypass cycle recalculation slowdowns.

Frequently asked

How can I open a SolidWorks file (.sldprt / .sldasm) without SolidWorks?: You can view these files for free using Autodesk Viewer or Dassault's official free eDrawings Viewer. If you need to edit or import them into other CAD platforms (like Fusion 360, Rhino, or Onshape), these platforms have built-in importers that convert them to their native geometries.
What is the best way to convert SLDPRT files to a universal format?: The industry standard is to export the file from SolidWorks as a STEP (.step) or Parasolid (.x_t) file, which preserves high-fidelity 3D solid geometry without design history.

Need a specific conversion?

Our interactive CAD Matchmaker filters all 8 SLDPRT-compatible platforms against your budget, hardware configuration, and precise parametric drafting needs.

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Full read & write support (2)

Read-only / viewers (6)

Frequently asked

Need a specific conversion?

Other file formats