Best free online CAD software (2026): An honest comparison

Search for best free online CAD software and you'll quickly discover that almost every product claims to be free. In reality, "free" can mean anything from a generous community edition to a 14-day trial, a personal-use licence, or software that only works if you install it on your own computer.

That makes choosing a CAD package surprisingly difficult.

After talking with engineers, architects, fabricators, surveyors, and designers, we've found that people usually ask the wrong question.

Instead of asking:

"Which CAD software is free?"

A better question is:

"Which CAD software fits the way I actually work?"

Some people need a powerful desktop application with decades of features. Others simply need to open a drawing, make a few edits, collaborate with a colleague, and export a PDF.

Those are very different problems.

This guide compares the major categories of free CAD software, highlights the trade-offs, and explains where browser-based tools like BranchCAD fit.

First decide: 2D or 3D?

Before comparing products, narrow your search.

If you're designing mechanical parts, assemblies, or objects for manufacturing or 3D printing, you're looking for 3D CAD. Products such as Fusion, SolidWorks and Onshape are designed for that workflow.

If you're producing engineering drawings, floor plans, site layouts, utility drawings, fabrication details or schematics, you're almost certainly looking for 2D CAD.

BranchCAD is built specifically for 2D drafting, so the rest of this article focuses on that category.

Not all "free" CAD software is actually free

This is where many people get caught out.

A CAD package may advertise itself as free while hiding important restrictions such as:

• Personal use only
• Educational licence
• Public projects only
• Trial expires after a few weeks
• Limited exports
• Watermarked drawings
• No commercial licence
• Cloud storage limits

None of these are necessarily bad—they simply suit different users.

If you're working professionally, always check the licensing before investing time learning a new tool.

Desktop CAD vs browser-based CAD

Ten years ago, almost every CAD application was installed locally.

Today, that's no longer the only option.

Desktop CAD

Desktop applications such as LibreCAD, QCAD and AutoCAD provide mature drafting environments and excellent performance.

Advantages:

• Works without internet
• Mature toolsets
• Large plugin ecosystems
• Better suited for very large drawings

Disadvantages:

• Installation required
• Updates managed locally
• Moving between computers is inconvenient
• Collaboration usually happens by emailing files

Desktop software still makes perfect sense for many engineers.

Browser-based CAD

Browser CAD has improved dramatically over the last few years.

Instead of installing software, you simply open a browser and start drawing.

Advantages:

• No installation
• Works on Windows, macOS, Linux and Chromebooks
• Easy sharing
• Automatic updates
• Ideal for distributed teams

Disadvantages:

• Requires an internet connection
• Some advanced desktop workflows are still better suited to traditional CAD

If your work involves multiple people reviewing and editing drawings, browser-based workflows are becoming increasingly attractive.

Open source vs cloud software

Another common misconception is that open source and online mean the same thing.

They don't.

Open-source CAD means the source code is publicly available. You can inspect it, modify it and sometimes contribute improvements.

Online CAD simply means the software runs in your browser.

For example:

• LibreCAD is open source, but runs on your computer.
• BranchCAD runs entirely in your browser, but isn't open source.

Neither approach is inherently better—they solve different problems.

How the major CAD options compare

Rather than pretending one product is perfect, here's a simplified comparison of some popular options.

Every product above has strengths.

The important question isn't which one has the biggest feature list.

It's which one matches your workflow.

Where existing CAD software works well

LibreCAD

LibreCAD is probably the best-known open-source 2D CAD application.

It's mature, stable, completely free, and capable of producing professional drawings.

If you're happy installing software and mostly work alone, it's an excellent choice.

Where it starts to struggle is collaboration. Drawings remain files that need to be shared manually, and revision history is largely your responsibility.

QCAD

QCAD has been around for many years and is popular among engineers looking for a lightweight drafting package.

It performs well and has a familiar workflow.

Like most desktop CAD applications, collaboration is handled outside the software using shared folders, cloud storage or email.

AutoCAD Web

AutoCAD remains the industry standard in many organisations.

The web version makes reviewing and editing drawings much easier than the traditional desktop workflow.

However, it's part of a commercial ecosystem and may be more than many small businesses or freelancers actually need.

Onshape

Although primarily a 3D CAD platform, Onshape deserves mention because it demonstrated how collaborative engineering software could work in the browser.

Its version history and collaborative editing are excellent.

The catch is that the free plan requires projects to be public, making it unsuitable for many commercial users.

The problem most CAD software still hasn't solved

Most CAD applications still treat drawings as files.

That leads to folders that look something like this:

SitePlan.dwg
SitePlan_v2.dwg
SitePlan_Final.dwg
SitePlan_Final2.dwg
SitePlan_Final_Approved.dwg
SitePlan_Final_Approved_Really_Final.dwg

Anyone who's worked in engineering has seen something similar.

Finding the correct revision becomes a guessing game.

Recovering work from last Tuesday often means searching old backups.

Collaboration usually means locking files or emailing new versions.

The software itself isn't the problem.

The workflow is.

Why we built BranchCAD

BranchCAD wasn't created because the world needed another CAD program.

It was created because modern software development solved collaboration years ago, while most CAD workflows still revolve around files.

Instead of asking users to manage revisions themselves, BranchCAD treats drawings more like source code.

That means you can:

• Restore previous versions without digging through folders.
• Compare changes visually.
• Branch drawings before experimenting.
• Merge work instead of overwriting someone else's changes.
• Collaborate in real time inside the same drawing.
• Open a project from almost any modern computer without installing software.

For many teams, these capabilities save more time than adding another hundred drawing commands.

Is BranchCAD the best free online CAD software?

That depends on what you're trying to do.

If you're looking for a mature desktop drafting package that runs offline, LibreCAD or QCAD may be a better fit.

If you're already invested in Autodesk's ecosystem, AutoCAD Web integrates well with that environment.

If you're designing complex 3D mechanical assemblies, BranchCAD isn't the right tool.

But if your work revolves around 2D engineering drawings, you collaborate with others, move between computers, or are tired of juggling dozens of drawing revisions, BranchCAD offers something genuinely different.

Rather than trying to replace every CAD application, we're focused on improving the everyday workflow around creating, reviewing and managing technical drawings.

Final thoughts

The best free online CAD software isn't necessarily the one with the longest feature list.

It's the one that fits your workflow.

For some people, that's an open-source desktop application.

For others, it's a commercial platform backed by decades of development.

And for teams that value browser access, collaboration and built-in version control, BranchCAD may be worth a look.

If you'd like to try it yourself, you can start designing for free without a credit card. We also recommend reading our guide on what you can do with browser-based CAD or comparing our available plans.