AutoCAD was launched in 1982 with an idea that seemed almost revolutionary at the time: bringing computer-aided design from large computing systems to the personal computer. The initial planned price was $1,000, according to Autodesk’s historical documents, a one-time purchase that gave architects and engineers access to a tool that had previously required far more expensive systems. More than four decades later, AutoCAD is mainly offered through subscriptions, but the more interesting question is no longer just how much the software costs. It is how much it can cost to leave the ecosystem built around its DWG format.
The key facts about AutoCAD and DWG in 20 seconds
- AutoCAD appeared in 1982 with an initial planned price of $1,000.
- Autodesk created DWG as AutoCAD’s native format and continues to maintain it as proprietary technology.
- Since 2018, current AutoCAD releases have used the same native DWG format, although different software generations still exist.
- Commercial alternatives can open, edit and save DWG files, while free options are available for 2D CAD.
- DXF, STEP and IFC provide more documented or standardized exchange options, but they do not completely replace DWG in every workflow.
The phrase “if you stop paying, the drawing switches off” needs one important clarification. The DWG file does not switch off. It remains a file stored on a disk and can be opened with different programs, including Autodesk’s free viewers and third-party applications. What disappears when an AutoCAD subscription ends is the right to continue using the software under that license. Autodesk currently offers AutoCAD primarily through monthly or annual subscriptions, as well as Flex for occasional use.
The real issue is different: how dependent a company has become on a format and on all the workflows built around it over the years.
From the $1,000 purchase to the subscription model
Historical company documents show that in August 1982 Autodesk set the initial price of AutoCAD at $1,000. The first version was designed to run on microcomputers and was positioned as a much more accessible alternative to CAD systems that previously required large, expensive machines.
The Computer History Museum also preserves an oral history of Autodesk in which the company’s early executives explained how that price was determined. The $1,000 figure was extraordinary for microcomputer software at the time, but was considered reasonable compared with the cost of existing CAD hardware and software.
The strategy worked. AutoCAD helped bring CAD to professionals who could now work on computers far smaller than the workstations previously used for this type of design. Over time, the program evolved from a drawing application into a platform around which routines, plug-ins, libraries, automation and complete workflows were built.
That is where the value of the format began to grow.
DWG is more than a file extension
Autodesk created DWG with the first AutoCAD in 1982 and currently describes it as the native format of its AutoCAD products. A DWG file can contain geometry, layouts, maps, images and other data used in a CAD project.
The difference between a file and a seemingly simple format becomes important when a project accumulates years of work.
A company may have thousands of historical drawings, customized blocks, external references, layers, plotting styles, AutoLISP routines, templates and internal procedures tied to AutoCAD. Changing applications does not simply mean installing another program and opening the first DWG.
It also means checking what happens to specific entities, external references, dynamic blocks, annotations, constraints and automation.
And this is where one of the less visible problems appears: two applications can open a DWG without necessarily reproducing exactly the same behavior. Dassault Systèmes, for example, acknowledges in its DraftSight documentation that applications from different vendors may have specific or proprietary functionality even when they work with DWG and DXF.
File compatibility should therefore not be confused with complete application equivalence.
DWG versions are not all the same
One detail that is easily lost when discussing “DWG compatibility” is that there are different generations of the format.
| AutoCAD generation | Native DWG format | Internal code |
|---|---|---|
| R11/R12 | DWG R11/R12 | AC1009 |
| R13 | DWG R13 | AC1012 |
| R14 | DWG R14 | AC1014 |
| 2000/2000i/2002 | DWG 2000 | AC1015 |
| 2004/2005/2006 | DWG 2004 | AC1018 |
| 2007/2008/2009 | DWG 2007 | AC1021 |
| 2010/2011/2012 | DWG 2010 | AC1024 |
| 2013-2017 | DWG 2013 | AC1027 |
| 2018-2027 | DWG 2018 | AC1032 |
Autodesk has maintained DWG 2018 as the native format from AutoCAD 2018 through AutoCAD 2027. That means that not every annual AutoCAD release necessarily introduces a new DWG file structure.
An older version of AutoCAD cannot directly open a DWG created using a later format. Autodesk provides tools such as DWG TrueView to view and convert files between certain versions.
Is DWG a closed format?
This is where the subject requires some nuance.
DWG is a proprietary Autodesk format, according to Autodesk itself. But that does not mean Autodesk prevents other applications from working with .dwg files. The company states that it does not seek to prevent third parties from using the .dwg extension or developing software compatible with the format.
In fact, an entire industry has developed around DWG interoperability.
The Open Design Alliance (ODA) develops technology for reading, creating, editing and saving DWG and DGN files. Its Drawings SDK provides access to DWG data and allows applications to create files or save them in different compatible versions.
The existence of this technology is important because it shows that DWG does not mean users are forced to run AutoCAD.
There is, however, a technical dependency. The more complex a file is and the more AutoCAD-specific features it uses, the more important it becomes to verify how accurately another application reproduces those elements.
The history of this interoperability has also included legal disputes. Autodesk and ODA reached an agreement in 2010 concerning DWG-related trademarks, allowing ODA to continue developing interoperable software and using the .dwg extension while withdrawing certain DWG-related trademarks from its commercial activities.
The competition around DWG
Today’s market offers several alternatives. Some compete directly with AutoCAD while retaining DWG as a working format, while others focus on different exchange standards.
| Software | Focus | DWG | DXF | Licensing model |
|---|---|---|---|---|
| AutoCAD | Professional 2D/3D CAD | Native | Yes | Subscription / Flex |
| BricsCAD | 2D/3D CAD, BIM and mechanical | Native | Yes | Subscription and perpetual |
| DraftSight | DWG-oriented 2D/3D CAD | Yes | Yes | Subscription; perpetual options in some plans |
| ZWCAD | DWG-compatible 2D/3D CAD | Native | Yes | Subscription and perpetual |
| QCAD Professional | 2D CAD | Yes | Yes | Commercial |
| LibreCAD | Open-source 2D CAD | Not primary | Yes | GPL, free |
BricsCAD supports reading and writing different DWG and DXF generations and continues to offer perpetual licensing alongside subscriptions.
DraftSight, from Dassault Systèmes, supports creating, opening and editing DWG, DXF and DGN files.
ZWCAD also focuses directly on DWG compatibility and offers perpetual licenses alongside other models, depending on the product and market.
At the more open end are QCAD and LibreCAD. QCAD Professional supports reading and writing multiple DWG and DXF generations, while LibreCAD focuses on 2D CAD and is distributed as free software under the GPLv2 license.
That said, a DWG-compatible alternative is not necessarily a perfect replacement for AutoCAD. Differences in automation, APIs, blocks, special entities, 3D, BIM, vertical applications and established workflows can matter greatly to a company.
What about open formats?
This is where the issue becomes more interesting for organizations looking to reduce dependence on a single vendor.
There is no single “open DWG” that solves every use case. Different formats are designed for different purposes.
| Format | Organization / standard | Main use | Replaces DWG? |
|---|---|---|---|
| DWG | Autodesk / DWG ecosystem | Native 2D/3D CAD | Reference format for AutoCAD |
| DXF | Autodesk specification | CAD drawing exchange | Partially |
| STEP | ISO 10303 | Product and 3D CAD data exchange | No, different scope |
| IFC | ISO 16739 / buildingSMART | BIM information exchange | No, complements other formats |
| SVG | W3C | 2D vector graphics | No, lacks a full CAD data model |
| ISO 32000 | Documentation and distribution | No, primarily for delivery and viewing |
DXF is probably the closest option to an exchange format for 2D CAD drawings, but it should not be confused with a neutral international standard. Autodesk publicly documents its structure and describes it as a representation of information contained in an AutoCAD drawing.
STEP serves a different purpose. The ISO 10303 family is designed to represent and exchange product information throughout its lifecycle, including design and manufacturing. It is much broader than a 2D drawing format.
For architecture and construction, IFC is considerably more relevant. ISO 16739-1:2024 defines it as an open international standard for exchanging Building Information Modeling (BIM) information between different applications. It covers buildings and infrastructure and supports information across different lifecycle stages.
SVG, meanwhile, is a World Wide Web Consortium (W3C) standard for two-dimensional vector graphics. It is open and extremely useful for graphics, but it is not intended to represent the complete semantic model of a CAD project.
The real dependency is everything around the file
The problem with DWG, therefore, is not that the file becomes unusable when an AutoCAD subscription ends. Free viewers, converters and third-party applications exist. Autodesk itself provides DWG TrueView at no cost for viewing and converting DWG files.
The dependency appears when an organization has built its way of working around a particular piece of software and format for years.
The file can survive AutoCAD. What can be difficult to preserve is all the relationships, automation, objects and processes that make that file genuinely useful.
A drawing can be converted to DXF. 3D geometry can be exported to STEP. A BIM project can be exchanged through IFC. An alternative application can open a DWG. But every conversion can potentially lose information, particularly when proprietary objects or software-specific features are involved.
For that reason, the most practical strategy for a company is not necessarily to abandon DWG. It can be to avoid making DWG the only copy of important information.
Maintaining documented versions, exporting to appropriate exchange formats for each discipline, keeping PDF copies for documentation, recording the DWG versions being used and regularly testing whether other applications can open the files are more concrete measures than simply debating licensing models.
AutoCAD’s paradox is that what began as a tool designed to make CAD more accessible eventually created one of the most persistent file ecosystems in professional computing.
In 1982, a program could be purchased for $1,000. In 2026, AutoCAD can be purchased through subscriptions costing more than $2,000 per year in some markets. But the cost that matters most to a company may not appear on the annual invoice. It can be hidden in everything that would have to be rebuilt if the organization eventually decides to change platforms.
Frequently asked questions
If I stop paying for AutoCAD, do I lose my DWG files?
No. DWG files remain in the user’s storage. What ends is the right to use AutoCAD under the subscription. Free viewers and alternative applications can open DWG files.
Is DWG an open format?
Not in the sense of an international open standard such as IFC or a specification maintained by organizations such as ISO or W3C. Autodesk identifies DWG as its proprietary format, although third parties can develop software that supports DWG.
What are the alternatives to AutoCAD?
Commercial alternatives include BricsCAD, DraftSight and ZWCAD. For 2D CAD, QCAD and LibreCAD are also available, although their capabilities and levels of DWG compatibility differ.
What is the best format for saving a drawing without depending on AutoCAD?
There is no single universal format. DXF can be useful for CAD drawing exchange, STEP is appropriate for certain types of 3D CAD data, IFC is designed for BIM information exchange, and PDF is useful as a documentary copy. The right choice depends on the type of project and the information that needs to be preserved.