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 Standard36 verified tools

Software That Opens & Edits SLDPRT Files (36 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.

Instant SLDPRT Engineering Utilities

Convert, Compress & Inspect SLDPRT Files Online

Universal File Compressor →

B-Rep Exchange

SLDPRT / CATPart / NX to STEP

Lossless neutral ISO 10303-21 B-Rep solid assembly conversion.

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Size Optimizer

STEP Assembly Defeature & Reducer

Strip internal fasteners & threads to shrink 300MB+ STEP files.

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PMI Standard

STEP AP214 vs AP242 Comparator

Compare automotive AP214 vs Model-Based Definition AP242.

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Full read & write support (2)

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

Read-only / viewers (34)

AM
ANSYS MechanicalRead Only
Custom Quote · Windows / Linux · ★ 4.9
The gold standard for structural FEA simulation.
M
MagicsRead Only
Custom Quote · Windows · ★ 4.9
Data and build preparation for 3D printing.
M
MastercamRead Only
Subscription / Perpetual · Windows · ★ 4.9
The global leader in CAM software for manufacturing.
O
OnshapeRead Only
Subscription · Web / iOS / Android · ★ 4.9
The professional CAD system built for agile cloud development.
AH
Altair HyperWorksRead Only
Subscription · Windows / Linux · ★ 4.8
Comprehensive simulation-driven design platform.
C
CimatronRead Only
Subscription · Windows · ★ 4.8
Integrated CAD/CAM for mold and die makers.
F3
Fusion 360Read Only
Subscription · Windows / macOS / Android / iOS · ★ 4.8
The cloud-native powerhouse for integrated CAD, CAM, and CAE.
PC
PTC CreoRead Only
Subscription · Windows · ★ 4.8
The original parametric 3D CAD powerhouse.
SN
Siemens NXRead Only
Custom Quote · Windows / Linux · ★ 4.8
Powerful high-end CAD/CAM/CAE suite for advanced manufacturing.
S
SolidCAMRead Only
Subscription · Windows · ★ 4.8
The leading integrated CAM for SolidWorks.
VM
VISI ModellingRead Only
Subscription · Windows · ★ 4.8
Specialized CAD/CAM for the mold and die industry.
AI
Autodesk InventorRead Only
Subscription · Windows · ★ 4.7
Professional-grade 3D mechanical design and simulation.
C
CATIARead Only
Subscription / Perpetual · Windows · ★ 4.7
The high-end PLM standard for Aerospace and Automotive engineering.
S
Shapr3DRead Only
Freemium · Windows / macOS / iOS · ★ 4.7
Professional CAD for mobile and desktop mobility.
SE
Solid EdgeRead Only
Subscription / Perpetual · Windows · ★ 4.7
Professional 3D CAD with industry-leading Synchronous Technology.
3W
3Dstudio.co Web ToolsRead Only
Free · Web · ★ 4.6
Free client-side browser tools to view, inspect, and convert IFC, STEP, STL, DWG, and 3D files without uploading.
AW
ANSYS WorkbenchRead Only
Subscription · Windows / Linux · ★ 4.6
Unified Ansys simulation platform for project management, geometry prep, and multi-physics coupling.
C
CAMWorksRead Only
Subscription · Windows · ★ 4.6
Knowledge-based CAM solution by HCL Technologies.
M2
MECHCAD 2026Read Only
Custom Quote · Windows · ★ 4.6
Professional 3D parametric CAD suite with part and assembly modeling, kinematic motion simulation, and CNC toolpath generation.
AI
Altair InspireRead Only
Subscription · Windows · ★ 4.5
Generative design and rapid FEA platform from Altair, with topology optimization at its core.
AD
ANSYS DiscoveryRead Only
Subscription · Windows · ★ 4.5
Real-time simulation-driven design with live solver feedback during modeling.
K
KeyShotRead Only
Subscription · Windows / macOS · ★ 4.5
Real-time ray-tracing rendering software for product visualization and industrial design.
MA
MSC AdamsRead Only
Custom Quote · Windows / Linux · ★ 4.5
Multibody dynamics simulation for mechanisms, vehicles, and powertrains.
Z
ZW3DRead Only
Subscription / Perpetual · Windows · ★ 4.5
All-in-one 3D CAD/CAM solution from ZWSOFT.
C
CADPropsRead Only
Free · Web · ★ 4.4
Free browser-based multi-format CAD viewer and engineering measurement platform.
G
GloviusRead Only
Freemium · Windows / Web / iOS / Android · ★ 4.2
Mobile 3D CAD file viewer for viewing and analyzing 3D models.
M
MoldflowRead Only
Subscription · Windows · ★ 4.0
Autodesk injection molding simulation software for plastic part and mold design.
G
GibbsCAMRead Only
Perpetual · Windows · ★ 3.9
Cutting-edge CAM software for programming CNC machine tools with power and flexibility.
F
FeatureCAMRead Only
Subscription · Windows · ★ 3.8
Automated CAM software for CNC milling, turning, and Swiss machining — offered as Autodesk Fusion with FeatureCAM.
V
VisiRead Only
Perpetual · Windows · ★ 3.7
CAD/CAM software by Hexagon for mold, die, and progressive die design.
B
BobCAD-CAMRead Only
Perpetual · Windows · ★ 3.5
US-based affordable CAD/CAM software for CNC machining with 2-5 axis capabilities.
S
SURFCAMRead Only
Perpetual · Windows · ★ 3.5
US-based CAM software for 2-5 axis milling, turning, and wire EDM.
E
ESPRITRead Only
Custom Quote · Windows · ★ 0.0
High-performance CAM software for CNC programming, covering 2-5 axis milling, turning, mill-turn, and Swiss-type machining.
T
TopSolidRead Only
Custom Quote · Windows · ★ 0.0
TopSolid, a global leader in CAD/CAM/ERP software publishing, primarily targets the mechanical engineering, sheet metal

Showing top 20 products. Click to show remaining 14 tools.

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 36 SLDPRT-compatible platforms against your budget, hardware configuration, and precise parametric drafting needs.

Launch Matchmaker →

Convert, Compress & Inspect SLDPRT Files Online

SLDPRT / CATPart / NX to STEP

STEP Assembly Defeature & Reducer

STEP AP214 vs AP242 Comparator

Full read & write support (2)

Read-only / viewers (34)

Frequently asked

Need a specific conversion?

Other file formats