SOLIDWORKS to Onshape: What happens to your legacy data?

Moving from SOLIDWORKS to Onshape? Learn how teams keep legacy data visible, reduce migration risk, and manage a phased transition with continuity.

Christina Rebel

Mar 27, 2026

Cloud PDM

SOLIDWORKS to Onshape: What happens to your legacy data?

So your team has decided to move from SOLIDWORKS to Onshape. The cloud-native promise is real: no installations, no VPN headaches, easy browser-based collaboration. For many small-to-mid-size engineering teams, it is a genuinely better way to work.

But here is what usually catches people off guard:

Your old SOLIDWORKS data does not magically follow you into the cloud.

Those legacy assemblies, released drawings, supplier reference models, archived revisions — they are still sitting in your SOLIDWORKS PDM vault (or worse, scattered across shared drives). And your business still needs them.

This guide walks you through the practical steps of managing a SOLIDWORKS-to-Onshape transition — what transfers, what does not, and exactly how to keep your legacy data visible without staying trapped in the old workflow. For the broader framework, see CAD Migration Without Data Chaos: Why Engineering Teams Need a Neutral PDM Layer.

Wait — Isn't Moving to the Cloud Supposed to Be Simple?

Moving from SOLIDWORKS to Onshape? Learn how teams keep legacy data visible, reduce migration risk, and manage a phased transition with continuity.

Onshape is cloud-native. SOLIDWORKS is desktop-based. On the surface, it sounds like you just stop installing software and start working in a browser. Simple, right?

Not quite. The authoring side is straightforward. The data side is where things get complicated.

Here is a quick reality check. With Onshape, your team can now:

✅ Share a design link instead of emailing a .sldprt file

✅ Skip VPN setup for remote engineers and contractors

✅ Collaborate in real time without check-out conflicts

✅ Eliminate workstation dependency for new projects

But your team still needs to:

❌ Access old SOLIDWORKS assemblies for support and manufacturing

❌ Answer supplier questions about released designs

❌ Reference archived revisions for quality audits

❌ Keep visibility across both old desktop work and new cloud work

That second list is the real migration challenge. Adopting Onshape for new work is one thing. Knowing what to do with years of SOLIDWORKS history is another thing entirely.

Why Teams Move from SOLIDWORKS to Onshape

Organizations usually make this move for practical reasons:

wanting cloud-native collaboration

reducing dependency on heavy desktop deployment

supporting more distributed engineering teams

simplifying access for contractors or remote contributors

accelerating new-product workflows without full workstation dependency

These are strong reasons to adopt a cloud CAD model.

But even when the case for Onshape is clear, the question of legacy data remains unresolved. Most companies still need access to years of SOLIDWORKS work after the new platform is introduced. Teams face similar data continuity challenges when switching from SOLIDWORKS to Siemens NX or moving from CATIA to Creo — the pattern is consistent across all CAD migrations.

What Transfers — And What Gets Left Behind

Onshape provides SOLIDWORKS import capabilities. But "import" and "full migration" are not the same thing.

What typically transfers well

Part geometry — solid bodies, surfaces, and basic features can usually be imported

Assembly structure — component relationships and positioning are generally preserved

Standard formats — STEP, IGES, and Parasolid files import cleanly as expected

Where the gaps appear

Area	What happens during import	Why it matters
Parametric feature history	Lost during import — geometry becomes a "dumb solid"	Engineers cannot edit features using the original design intent; modifications require rebuilding from scratch
Drawing references	SOLIDWORKS drawings do not transfer directly into Onshape Drawings	Released drawings may need to be recreated or maintained separately
PDM metadata	Revision history, approval records, workflow states, and custom properties from SOLIDWORKS PDM do not carry over	Compliance-critical metadata and audit trails are left behind
File references and links	Complex assembly references, configurations, and design tables may not survive intact	Large assemblies with many configurations can break during import
Toolbox and library parts	Standard hardware and library components may not map to Onshape equivalents	Imported assemblies may have missing or mismatched fasteners and standard parts
Macros and automation	VBA macros, DriveWorks rules, and SOLIDWORKS-specific automation do not transfer	Automated workflows built over years need to be rebuilt in Onshape's FeatureScript or API
Large archive volumes	Importing tens of thousands of files one by one is impractical	Bulk migration of legacy archives is time-consuming and error-prone

The result: Onshape works well for new projects starting fresh, but importing a large legacy SOLIDWORKS archive with full fidelity is rarely practical.

The Legacy Data Problem

This is where the migration gets harder.

The new system may work well for future design authoring, but the business still relies on a large volume of historical engineering data created elsewhere:

SOLIDWORKS parts and assemblies

drawings tied to released designs

reference models used by suppliers

archived revisions for quality or support

active programs that cannot move immediately

Without a clear strategy, teams end up in a split environment:

new work begins in Onshape

old work remains in SOLIDWORKS

people search in multiple places

management loses a single view of the archive

collaboration becomes less consistent across old and new projects

This is the real migration risk — not simply converting files, but losing clarity about where important engineering data lives and how it is used. This is the same problem that drives companies to seek SOLIDWORKS PDM alternatives even without a CAD platform change.

"The best thing for us is that anyone can work on any project at any given time. And it's all cloud-based, so that's good."

— A European engineering design firm · Project Manager (previously on GrabCAD before it shut down)

Why SOLIDWORKS PDM Doesn't Solve the Transition

Some teams assume they can keep running SOLIDWORKS PDM alongside Onshape during the overlap period. On paper, that works. In practice, it creates friction:

SOLIDWORKS PDM requires SOLIDWORKS licenses to access most functionality — which defeats the purpose of moving to Onshape

Non-CAD stakeholders (manufacturing, procurement, quality, suppliers) still need a way to review legacy files without installing SOLIDWORKS

Two separate systems means two sets of permissions, two search interfaces, and two sources of truth

Cost savings from Onshape adoption are offset by maintaining the legacy SOLIDWORKS PDM infrastructure

If you are evaluating other options, SOLIDWORKS PDM Alternatives for Small Engineering Teams covers the landscape.

Why "Just Convert Everything" Usually Fails

A common instinct is to solve the problem with a full immediate migration: convert all SOLIDWORKS data into the new environment and retire the old one.

That sounds efficient, but in practice it creates new risk.

Scale

Even a modest engineering team may have thousands or tens of thousands of SOLIDWORKS files spread across assemblies, parts, and drawings.

Fidelity

CAD conversion is not always neutral. Design history, references, configurations, and drawing relationships may not carry over in ways teams can trust for real engineering use.

Timing

Not every project moves at the same speed. Some products remain supported in SOLIDWORKS while new programs begin in Onshape.

Business Continuity

Even if old files can be converted, teams still need a reliable way to review and reference what came before, often for years.

This is why many organizations discover that the hardest part of the move is not adopting Onshape — it is deciding what to do with the legacy SOLIDWORKS archive.

A Better Question: How Do You Keep Legacy Data Visible?

The more useful question is not:

How fast can we move everything?

It is:

How do we keep legacy data visible and manageable while new work begins elsewhere?

That shift in thinking matters. A successful transition needs to support:

old data still being referenced

new work starting in the cloud

suppliers and internal teams using mixed formats

ongoing review and collaboration across both environments

a gradual reduction in dependence on the old authoring model

This is a continuity problem as much as a CAD problem.

The Three-Step Playbook: Decouple → Coexist → Transition

Here is the approach that works for most teams. It is not a theoretical framework — it is what we see engineering organizations actually do when they get this right.

Step A: Decouple

Stop requiring the old desktop workflow for every routine task. Make the archive accessible without SOLIDWORKS licenses.

Step B: Coexist

Run both systems side by side. Old SOLIDWORKS data and new Onshape work stay visible in the same place. No one has to choose between "old world" and "new world" for day-to-day access.

Step C: Transition

Gradually shift active engineering work to Onshape. Reduce the number of people who still need the old desktop environment. Let the business set the pace.

This is not a 90-day sprint. For most teams, it takes 12–24 months. And that is fine — the goal is continuity, not speed.

Step A: Decouple Your SOLIDWORKS Archive

Before you convert a single file, ask yourself: how many of these old files actually need to be edited again?

For most teams, the honest answer is: very few. The majority of legacy data just needs to be visible — browsable, reviewable, and accessible for reference.

Here is your practical checklist:

Audit your SOLIDWORKS vault — identify what is still actively edited vs. what is reference-only

Centralize project data — get everything out of scattered shared drives into one organized location

Preserve folder structure and context — do not flatten your archive; keep the project organization intact

Set up browser-based access — so project managers, quality, and suppliers can review files without SOLIDWORKS

Export PDM metadata — capture revision history and approval records before they become inaccessible

The key insight: you do not need to migrate old files into Onshape to make them useful. Import them into a file-based cloud PDM that supports native SOLIDWORKS formats. That separates archive visibility from the old desktop infrastructure — and immediately reduces your SOLIDWORKS license dependency.

Step B: Run Both Systems Side by Side

This is the phase that trips people up — because it feels like you are not making progress. You are. Coexistence is not a sign of failure. It is the realistic middle stage.

Here is what this looks like in practice:

Your new product development team starts all projects in Onshape

Your sustaining engineering team still references SOLIDWORKS assemblies for active programs

A supplier sends you a SOLIDWORKS file; you review it alongside your new Onshape work

Your quality team needs to pull up a drawing from 2019 for an audit

All of this needs to work at the same time. The trick is having one place where both old and new data are visible.

Common mistakes during coexistence:

Assuming everyone can switch on the same day (they cannot)

Letting two separate search systems exist without a shared layer

Forgetting that suppliers still send desktop-CAD files

Underestimating how long sustaining programs stay on the old platform

For multi-CAD coordination during this period, see Managing Multi-CAD Projects: Version Control Across SOLIDWORKS, Creo, and NX.

Step C: Shift Active Work to Onshape — Gradually

Once your team is comfortable with Onshape for new work and the legacy archive is accessible without SOLIDWORKS, you can start tightening the transition:

New projects: all start in Onshape (no exceptions)

Active programs: migrate only if there is a clear benefit; otherwise, finish them where they started

SOLIDWORKS licenses: reduce seats as fewer engineers need the desktop environment day-to-day

Legacy archive: treat as read-only reference — still visible, but no longer the active design space

A practical rule of thumb: if an engineer has not opened SOLIDWORKS in 30 days, they probably do not need the license anymore. Track usage and reallocate.

Why Shared Visibility Matters During This Shift

A major reason migrations feel chaotic is not the authoring tool itself, but the lack of a shared visibility layer across old and new work.

Without one, teams often lose track of:

which files remain legacy

which projects are already cloud-native

what suppliers still depend on

where the authoritative review copy lives

which archive data is still business-critical

This affects more than design teams. It impacts manufacturing, procurement, quality, and leadership.

That is why maintaining a neutral visibility layer is so important during this kind of transition.

How CAD ROOMS Fits This Transition Model

CAD ROOMS can act as a neutral, file-based cloud workspace during a SOLIDWORKS-to-Onshape transition.

Its role is not to replace SOLIDWORKS or Onshape as authoring platforms. Its role is to help engineering teams preserve visibility, collaboration, and control while old and new systems overlap.

That means teams can use CAD ROOMS to:

keep legacy SOLIDWORKS data visible and accessible — 30+ native CAD formats supported, viewable in the browser without SOLIDWORKS installed

maintain review workflows for old desktop-CAD files — with browser-based 3D viewing, measurement, and annotation

support secure external sharing and supplier collaboration during the switchover period

maintain version control and check-in/check-out across legacy files

manage access with role-based permissions for internal teams and external partners

reduce fragmentation while new work increasingly moves to cloud-native authoring

For a detailed comparison of approaches, see File-Based PDM vs CAD-Integrated PDM. For teams dealing with large legacy assemblies, browser-based viewing avoids the overhead of opening heavy files in native CAD.

Rather than forcing a risky full migration of everything at once, CAD ROOMS supports a controlled coexistence model.

"It's improved… visibility and the ability to measure… that's a big solve right there."

— A US precision manufacturing firm · Technical Lead

Quick Self-Assessment: Is Your Team Ready?

Before you start, ask these five questions:

How many active SOLIDWORKS projects do you have? If it is fewer than 10, you can move faster. If it is 50+, plan for a longer coexistence period.

Do your suppliers send you SOLIDWORKS files? If yes, you will need a way to review them even after your team moves to Onshape.

Does your quality or compliance team need access to old drawings? If yes, browser-based archive access is non-negotiable.

How many SOLIDWORKS licenses are you paying for? Every engineer who moves to Onshape full-time is a license you can drop.

Do you have a single searchable location for all engineering data? If not, that is the first thing to fix — before any CAD migration begins.

The Bottom Line

Moving from SOLIDWORKS to Onshape is not complicated because of the new tool. It is complicated because of the old data.

The good news: you do not have to solve both problems at once. Decouple your archive first, let the two systems coexist, and shift active work gradually. That is it.

CAD ROOMS makes the archive part easy — your legacy SOLIDWORKS data stays visible and reviewable in the browser while your team builds the future in Onshape.

The question is not "how fast can we leave SOLIDWORKS behind?" It is "how clearly can we keep working while the transition happens?" Get that right, and the rest follows.

Frequently Asked Questions

Q: Do I need to move every SOLIDWORKS file into Onshape immediately?

A: No. Most organizations benefit from a phased strategy. Historical and released SOLIDWORKS data can remain accessible while new programs begin in Onshape.

Q: Why is legacy data the hardest part of a SOLIDWORKS-to-Onshape move?

A: Because new authoring can start quickly, but the business still depends on years of legacy assemblies, drawings, and archived revisions for support, manufacturing, and reference.

Q: Can SOLIDWORKS and Onshape workflows coexist during the transition?

A: Yes. In most real-world transitions, they do. The challenge is maintaining a shared visibility and collaboration layer across both.

Q: How does CAD ROOMS help during a SOLIDWORKS-to-Onshape transition?

A: CAD ROOMS provides a neutral, file-based cloud workspace where legacy SOLIDWORKS data can remain visible and reviewable and manageable while new workflows move into Onshape.

Q: Does CAD ROOMS replace Onshape or SOLIDWORKS?

A: No. Native CAD tools still handle authoring and editing. CAD ROOMS supports visibility, collaboration, and continuity during the transition period.

Q: Can suppliers view my SOLIDWORKS files without SOLIDWORKS?

A: Yes. CAD ROOMS supports browser-based viewing, measurement, and annotation for SOLIDWORKS formats — plus 30+ other CAD and neutral formats. No CAD software installation required.

"After a two to three-year search, CAD Rooms is the first solution we have settled on and are happy with."

— A North American engineering services firm · CEO

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Moving from SOLIDWORKS to Onshape? CAD ROOMS keeps your legacy archive visible and accessible while you transition — no SOLIDWORKS licenses required. Book a demo to see how it works.

CAD Migration Without Data Chaos: Why Engineering Teams Need a Neutral PDM Layer — the pillar article for this series

SOLIDWORKS PDM Alternatives for Small Engineering Teams — for teams rethinking legacy PDM

File-Based PDM vs CAD-Integrated PDM for Multi-CAD Teams — why vendor-neutral file management matters

Managing Multi-CAD Projects: Version Control Across SOLIDWORKS, Creo, and NX — for multi-CAD coordination during coexistence

SOLIDWORKS to CATIA / 3DEXPERIENCE: Navigating the Dassault ecosystem shift