Free 2D/3D CAD Software

CAD freeware for home, business and university use. Download now for free and create your CAD drawings.
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Supported operating systems: Microsoft® Windows 10 and Windows 11

M4 PERSONAL is the powerful free 2D/3D CAD package

M4 PERSONAL has been used worldwide for many years to quickly create 2D drawings for home projects, and by hobbyists to produce 3D models ready for 3D printing. Due to its versatile CAD functionality, and its ability to edit DWG and DXF files, the software has also become established in many small companies. When used by companies, finished drawings are published for commercial use for a small fee e.g. converted to PDF or DXF format. This pay-per-result approach means that there is no cost to purchase the software, only for drawings that are used commercially.

Kostenlose CAD Software M4 PERSONAL

The M4 product family and services

CAD software for personal and educational use


M4 PERSONAL is used worldwide to turn project ideas into reality. Use the software free of charge for your personal projects or in educational institutions. Get started now and turn your ideas into reality!

Use M4 PERSONAL drawings commercially


Take advantage of our eSERVICES credit packages to convert your M4 PERSONAL drawings to DWG, DXF or PDF format. All converted drawings can be used commercially and without restrictions!

CAD software
for companies


Try our CAD solution for companies. It allows you to implement CAD projects of any size without restrictions. Comprehensive hotline support and software updates are of course included.

Advantages of the free CAD software

Many interfaces

Open and edit drawings in common formats (e.g. DWG or DXF) and convert them via our eSERVICES. 3D formats are also available.


Support for Metric and Imperial units and all common dimensioning standards. Drawing styles and templates are also customisable.


With M4 PERSONAL you can start your projects right away. If your requirements increase, you can always switch to the M4 DRAFTING package for companies.


In order to help you get started with MEDUSA4 Personal, we regularly upload new tutorial videos to our Youtube Channel, covering topics ranging from simple 2D drawing creation to 3D modelling.

Help Center

Behind our help centre is an intelligent Knowledge Database (KDB). You can directly ask questions and our KDB will offer helpful suggestions and solutions.


The software also includes comprehensive documentation to guide you from the very first concept through to the finished design.

Our products are used worldwide with over 250,000 licenses

“Alongside higher productivity, our investment in MEDUSA4 offers us greater automation capabilities, and the ability to standardise our CAD landscape across our group of companies. Integration issues should also become a thing of the past.”

Mr Bruno Ehrle, Head of Technology at OERTLI Werkzeuge AG

M4 PERSONAL modules & functionality


DXF/DWG Interface

DXF & DWG CAD-Schnittstelle
The DXF/DWG interface provided with M4 Personal allows you to import and edit existing 2D drawings. If you need to create DXF files from your M4 PERSONAL sheets for commercial use, you can convert the sheets at the CSG eSERVICES portal for a small fee. Universities or other educational institutions entitled to use the software for free can request free conversion credits for their eSERVICES account.

Customisable menus

Anpassbare CAD-Benutzeroberfläche
M4 PERSONAL’s menus are highly customisable. The ribbon menus and dashboard can be extensively adapted to suit the user’s requirements.

SMART Drafting Tool

Schnellerre CAD-Konstruktion
The software includes a Smart Drafting Tool for quickly and easily creating geometry. It allows construction lines to be automatically inferred between points created, and displays them dynamically as the cursor moves inside the drawing area. Users can automatically snap to existing segment points, determine grid step length and angles for subsequent points, determine incremental angles relative to the last line and easily extend existing geometry. Context sensitive information fields dynamically display segment length, angle or radii information as users draw their geometry.


CAD-Zeichnungen schneller editierenSMART-Edit

M4 PERSONAL includes a SMART Edit tool for dynamically editing designs, also known as “parametrics on demand.” The tool allows you to edit any drawing directly by selecting and dragging lines, or entering precise values for sizes and positions of geometric elements to effect change dynamically. Alternatively, drag or edit existing dimensions to create the correct geometric changes. SMART Edit deduces your intent from the geometry as a whole, taking into consideration dependent relationships between elements, and giving users a visual pointer as to how a change will affect their geometry.

2D Drafting

2D CAD Zeichnungserstellung
Unlike other free or cheap CAD systems, M4 PERSONAL is a fully functional MCAD suite with extensive, intelligent 2D tools and drafting functionality, including dynamic line and geometry creation tools, construction lines, grids, text tools, hyperlinks, a structure tree for logically grouping geometry, layer management, flexible dimensioning, and the ability to change sheet units from metric to imperial.

3D Modelling

3D CAD Modellierung
M4 PERSONAL contains the free basic 3D add-on, which allows users to quickly create 3D models based on 2D drawings – also known as “sheet-based modelling”. This simple method was developed for designers who want to take their existing knowledge into a 3D world, making it accessible even to people without 3D modelling knowledge. The software also provides an integrated 3D model viewer.


CAD Automatisierung
The PARAMETRICS (variational geometry) module included with M4 PERSONAL provides the functionality required to parameterise 2D drawings to quickly create design variants, and to automate many manual design, simulation and testing processes.

Raster Image Integration

Integration von Rasterdaten in CAD
M4 PERSONAL also contains the MEDRaster module for integrating, editing and saving colour or monochrome images (including scanned in hand drawings) within new or existing designs. The software supports raster images in the following formats: JPG, PNG, BMP and TIF.

Sheet Metal Design

Blechabwicklung mit CAD Software

The Sheet Metal Design (SMD) module included with the free CAD package draws on M4’s 2D drafting and 3D modelling capabilities. Starting in 2D or 3D, users can modify a flat pattern using the powerful tools provided, and then refold the model to ensure that the final solution is exactly what is required. Sheet metal features, such as flanges, tabs, corner tears and punching, can all be added in 2D, either explicitly, or as defaults. A powerful bend allowance tool allows you to correct your geometry or specify your own algorithm for bend allowance.

Parts Numbers and Parts Lists

Teiledaten und Stücklisten in CAD
The free MEDUSA4 Personal 2D/3D CAD program allows users to add attributes to elements on a sheet, including parts numbers, item number balloons and user defined attributes. These can then be included in automatically generated parts lists, which can be positioned on the drawing or exported.

FAQ: Your frequently asked questions and our answers

1. M4 PERSONAL Installation Guide

We deliver M4 PERSONAL always with an installation guide. You can download it as a PDF document in the download area:


2. Supported languages

M4 PERSONAL can be installed in English, German, French or Italian.

The documentation and online help are available from CAD Schroer in German and English.


3. Installation directory on Windows 10

Choose for the M4 PERSONAL installation folder a path name which does not contains blank spaces or special characters, this is why the default installation path cannot be (C:\Program Files).


4. Installation won’t start, aborted after extraction or is taking a long time

The installation can be aborted by several reasons.

1. The installation of M4 PERSONAL is executed by a user without administrator rights

If this is the case, there may be problems during installation. In this case, cancel the installation and ask the administrator to run the installation again.

2. The temporary directory does not exist or is named incorrectly

Make sure that the directory C:\temp exists and is writable.

If the extraction process stops after reaching 100 percent and the DOS error message “The system cannot find the specified path” appears, check whether the temporary area has a DOS-compliant name. Please check under “Start > Settings > Control Panel > System” in the tab “Advanced” on the item “Environment Variables” whether the variables “TMP” or “TEMP” do not contain special characters.

3. Blocking by the Windows firewall or the virus scanner

Unfortunately, some virus scanners cause problems when downloading, installing or running M4 PERSONAL, because the latest virus scanners do not know some M4 PERSONAL files. As these are unknown, their status is considered potentially dangerous and the virus scanner interrupts the download / installation / execution.

We assure you that M4 PERSONAL does not contain any viruses or trojans!

Please let us know which M4 PERSONAL files are classified as dangerous and which virus scanner you are using. We can then contact the software vendor so that this incorrect classification can be corrected at the next update of your virus scanner.

You can configure the Windows firewall under Control Panel > Windows firewall > Exceptions (for DRAFT.EXE and MX.EXE) or configure the firewall in such a way that it does not prevent the execution in principle, but requests its execution.

4. Broser path configured incorrectly

If you specify Firefox as browser and the path there is “C:\Programs\Mozilla Firefox\firefox.exe”
is enclosed (quoted) with ” then errors can occur. Please always use paths without ” … ” must be specified.


5. Windows security warning during installation

When executing the M4 PERSONAL installation file, Windows may display the security warning “Do you want to run or save this file?”

This dialog appears automatically because the M4 PERSONAL installation file does not contain a Microsoft signature. Click on “Run” to start the installation process.


6. Supported operating systems and hardware

Information about the currently supported operating systems and hardware can be found under:

1. Determining Your Computer’s Physical Address (MAC address)

Your computer’s Physical Address, also known as “MAC address” or “Ethernet address” can be determined by using the command prompt.

Determine Windows Physical Address Automatically:
Alternatively, use the program CSG-HostID.exe to automatically determine your physical address.


2. Multiple Physical Addresses (MAC Addresses)

If you have several network cards you will also have several physical (MAC) addresses. If you use the “getmac/v” or “ipconfig -all” command, you computer will these addresses. In order to determine which is the correct address for MEDUSA4 Personal licensing, please use the physical address of your local area conn.

For a manual request of the license file, the physical address of the network adapter which is integrated into the computer (no USB adapter) and always active should be selected.


3. Difference between the freeware M44 Personal of the commercial software M4 DRAFTING

M4 Personal offers most of the functionality of the professional M4 version. The following tools are available:

  • 2D Drafting (Basic)
  • 2D Symbols, creation and und editing
  • 2D Parametric Symbols, creation and und editing
  • Smart Drafting
  • 3D Drafting (Basic)
  • Sheet Metal Design
  • Import of AutoCAD® DXF/DWG files (Export in CSG eSERVICES)
  • Raster files, loading and modifying

M4 Personal is delivered with the documentation of the full version. Due to the limited range of functions, some tools are not available.

M4 Personal has its own license file format. License servers are not supported. When you start M4 Personal for the first time, you have to apply for a license, you will then receive a free license file.
The internal format of M4 Personal drawing files (*.she) and model files (*.mod) is different from the format of the professional version.

The commercial use of plots, PDF files, etc. created with M4 Personal is not allowed, for this reason a watermark is added to each plot.

To use drawings created with M4 Personalcommercially, CAD Schroer provides various conversion services in the CSG eSERVICES:

  • Plotting drawings in large formats (A0, A1, A2)
  • Converting drawings to PDF or DXF format
  • Converting drawings to SHE format of the MEDUSA4 professional version
  • Converting models to STL format

Registration in the CSG eSERVICES is free of charge, the plot and conversion services will be charged.


4. Replace license manually

Open a Windows Explorer window and change to the directory \medsys\med\license. You will find your license here with the file name csglmd.lic . If you want to update your new license, rename the new license to csglmd.lic and copy it into the named directory. Overwrite the existing license or rename it before copying.


5. Annual update of license and software

Each M4 PERSONAL license is valid for one year. After that, the license can simply be renewed for another year in the software.

We limit the license usage for several reasons. We publish a new version of M4 PERSONAL almost every year. The license update allows users to upgrade to the new version. We also sometimes change the functions to meet the requirements of our users and adjust them using the new licenses.


6. Does the M4 PERSONAL license cost me anything?

The M4 PERSONAL software as well as the M4 PERSONAL license are completely free of charge and can be downloaded via the CAD Schroer website or via the eSERVICES portal Licenses are valid for 12 months and can be extended free of charge.

Only the use of designs for commercial purposes incurs a conversion charge. Read more about our Pay per Result principle in this article:


7. Applying for a license

M4 PERSONAL can only be used on PCs with a correctly installed network card.

If you enter the command ipconfig /all or < installation directory >\medsys\med\license\lmutil lmhostid and your machine returns the results 00-00-00-00-00-00 or FF-FF-FF-FF-FF-FF, then this means that your computer does not have a network card installed, or that the card was not properly installed.

A Host ID in the format of 00-53-45-00-00-00 is also invalid, as it is not the physical address of your network card, and M4 PERSONAL will not run in this environment.


8. Update to a new M4 PERSONAL Version

If you want to use the newest version of M4 PERSONAL you need to download the current version and update the license. The old licensekey wont work with the newest version of M4 PERSONAL.


9. What’s a Physical Address (MAC Address)?

A MAC address (Media Access Control Adress, also known as Ethernet ID or Physical Address for Microsoft) is your network adaptor’s unique hardware address, which identifies your machine on a network.

It merely refers to your network adaptor and does not contain any personal information. We need this address to create your M4 PERSONAL license file, which will only run on your machine, preventing illegal copying and misuse of the software.

To find out your MAC address, open a command line and type: “getmac/v” or “ipconfig -all”


10. No license received

1. You do not have an active Internet connection or your firewall is blocking the contact to the license server. Then M4 PERSONAL cannot automatically obtain a license from the CAD Schroer servers.

In this case, use the online form to request a license:
Fill out the form and download the license to your PC. Select the license file in the licensing dialog.

2. You do not have an active network card and the licensing mechanism cannot identify a valid physical address (MAC address). In this case, activate your network card and restart M4 PERSONAL.


11. Renew Existing License

Your M4 PERSONAL license is valid for 12 months. When it’s expired, simply renew it in the software or visit to renew your license for another 12 months.

1. Remove watermark from printed page

Each M4 PERSONAL printout includes a watermark that informs the users that for commercial use, drawings must be converted in the CSG eSERVICES.

The conversion of the drawing into PDF, DXF or DWG format can also be done via the dialogue “File > eSERVICES conversion”. This requires the purchase of a conversion contingent in the CSG eSERVICES.

The conversion can also be done directly in the CSG eSERVICES.

There is no watermark in the converted files, which means that they can also be used commercially.


2. Print in colour from M4 PERSONAL

Both plotter drivers available in M4 PERSONAL are set up to print in monochrome by default. You can change one of these to allow you to do colour printing.

To do so, select “File > Options > Administrator” and enter the password “admin”. Then select “File > Options > Plotter configuration”.

The dialog presented lists all available plotter drivers. Select the “qtplot” plotter driver and click the “Edit Description” button.

In the file presented, change the text so that you comment out (add a “–“ to the line defining) the black and white printing options, and remove the comment marks from the colour printing options, then save the file:


— Criterion for selecting the pen is defined for black and white printout
lgc 1 col 0 0 0
softpens on
— Criterion for selecting the pen for color printout use one of the next
— workstation background white

— lgc off
— softpens on
— for manual pen assignment / definition please take a look at the
plotting guide


— Criterion for selecting the pen is defined for black and white printout
–lgc 1 col 0 0 0
–softpens on
— Criterion for selecting the pen for color printout use one of the next
— workstation background white

lgc off
softpens on
— for manual pen assignment / definition please take a look at the
plotting guide

3. Print from M4 PERSONAL

To print your M4 PERSONAL design, select “File > Print”.

Select a plotter driver in the “Available printers” section of the Print dialog.

You can use qtplot or the standard winplot driver. Both are set up by default to print in monochrome. To change this, see the FAQ on colour printing.

Click OK. You will now be presented with the familiar Print dialog which allows you to choose any printer on your network and begin printing.

1. Uninstalling M4 PERSONAL

To uninstall M4 PERSONAL under Windows®, click on the Start button and select “All Programs > M4 PERSONAL > uninstall MEDUSA4 Personal” . This will launch the uninstall wizard, which allows you to uninstall all components of the application. Alternatively, use the “Add or Remove Programs” option in the Control Panel to remove the software.

1. Notifications about new M4 PERSONAL versions

We will notify you about the release of a new M4 PERSONAL version via our newsletter, Facebook page or Twitter. Subscribe to the right channel to stay up to date.



2. M4 PERSONAL Download

You can download the latest version of M4 PERSONAL from our website:

Also check the system requirements:


3. Can I have a CD/DVD of the M4 PERSONAL software?

Because M4 PERSONAL is a free software product, it is only available as a download. You can access it at any time at .

1. Activate the administrator mode and change the administrator password

To switch to administrator mode, the password “admin” must first be entered and confirmed under “File > Options > Administrator”.
The admin password can then be changed under “File > Options > Administrator”.


2. PDF/DXF conversion for school and college students

High school and university students can receive free voucher codes to convert their drawings into PDF or DXF format. The codes can be requested from our website.


3. Convert 3D models to STL

In CSG eSERVICES ( ), MOD files can be converted to STL format for a small fee.
M4 PERSONAL does not offer its own STL export. Models are saved in MOD format.


4. MEDConfig in M4 PERSONAL

M4 PERSONAL is a compact 2D/3D package designed to meet the needs of home users and small-sized companies. Individual configurations are not possible in M4 PERSONAL and therefore MEDconfic cannot be run in this software.

Individual customizations can only be realized in the commercial packages of M4.


5. Publishing M4 PERSONAL drawings online

M4 PERSONAL drawings may only be publised online if there is no commercial context or monetary gain involved.

If you want to publish a drawing for commercial use (e.g. to illustrate a commercial website or a commercial service you provide, or to sell a drawing), you must first convert it for commercial use at CSG eSERVICES ( )


6. Using other QT LibrariesL

QT libraries are used to define the user interface in M4 PERSONAL. The libraries that should be used by the software are located in the directory “/medsys/med/share/”. If you receive an error message relating to a QT DLL when starting the system, then you probably have other QT DLLs in the SYSTEM32 directory. You will need to redefine the PATH environment variable to pick up the /medsys/med/share/ folder before the SYSTEM32 directory.


7. Change background colour of the sheet

To change the background colour of your M4 PERSONAL sheet you need to switch to Administrator under “File > Options > Administrator” and entering the password “admin“. Change the background colour in the menu under “File > Options > Administrator”.


8. Export sheets to DWG, DXF or PDF

The DXF, DWG and PDF export can be done in the software via File > eSERVICES Conversion. You need a conversion contingent in the eSERVICES. A tutorial about DXF and DWG export can be found here

You can also convert the files in the CSG eSERVICES (

All files can also be used commercially after conversion.


9. Error message during DWG/DXF import

The message “ERROR while importing file: No output written by converter program for: file.dwg” will always appear if M4 PERSONAL has a problem with importing the DWG/DXF file.

In this case, please open the file “Login.bat” under “/master_project/” with the text editor and enter the following command in a free line:


Then save the “Login.bat” file, restart M4 PERSONAL and re-import the DWG/DXF file. Now M4 PERSONAL automatically fixes the errors in the DWG/DXF file and imports the drawing.


10. MM4 PERSONAL video tutorials and documentation

For a quick start with M4 PERSONAL, the following tutorials are available:

You can find the complete documentation in the software. To open it, click the (?) question mark icon in the upper right corner of the software.

If you have activated a function, simply click the F1 button and the documentation will be opened for you at the relevant point.


11. How do I launch M4 PERSONAL?

After installing your license key file, there are 3 ways you can launch M4 PERSONAL (Assumption: M4 PERSONAL is installed C:\M4_PERSONAL\):

1) From the Windows Taskbar click
Start > All Programs > M4 PERSONAL > M4 PERSONAL

2) Create a new shortcut on your Desktop and point it to

3) Enter in Explorer:


12. Use symbols and standard parts

In M4 PERSONAL, you can create symbols from individual parts of your drawing and then load them on other drawings as needed.

Save Symbol
To save a selected geometry as a symbol, click “Start > Save named symbol” (under Symbol + Catalog). Then select a name and save directory for the symbol. At the end, the reference point must be selected in to save the symbol permanently. The symbol will then be saved.

Load Symbol
The symbol directory can then be added to the symbol list in the symbol manager under “Start > Load named symbol” (under Symbol + Catalog). In this dialog you will also get a preview of the existing symbols. The individual symbols can then also be comfortably loaded.

1. The online documentation and/or help won’t launch

You can set the browser path manually, by doing the following:

In the “\master_project” folder there is a file called “login.bat”. Use an editor of your choice to add the following line to the document, pointing it to the installation location of your Internet


set BROWSER=”C:\Program Files\Internet Explorer\Iexplore.exe”


2. Directory for PDF documentation

MEDUSA4 Personal comes with detailed documentation in the PDF format. It can be opened by clicking on the Help icon in the upper left corner of the software or by pressing F1 (if a function is active, the documentation is opened in the right position).

You can also open the documentation directly from the directory:

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