The most common formats relevant to simple CAD workflows include:
- DXF — commonly used for 2D CAD geometry
- DWG — commonly used for CAD drawings
- STEP — commonly used for exchanging 3D CAD geometry
- STL — commonly used for mesh-based 3D workflows
- PDF — commonly used as a drawing or visual reference for CAD preparation
The appropriate format depends on what you are creating and how the resulting file will be used.
DXF is commonly used to exchange 2D CAD geometry between different CAD applications and workflows.
It can be useful for tasks such as:
- Laser cutting
- 2D profiles
- Flat patterns
- Simple plates
- Brackets
- Panels
- 2D CAD drawings
When preparing a DXF, important information may include:
- Units
- Scale
- Closed profiles
- Holes and slots
- Layers
- Required geometry
- Manufacturing requirements
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DWG is a widely used CAD drawing format.
It can contain 2D drawing geometry and other drawing information depending on how the file was created.
DWG files may be useful for:
- Technical drawings
- 2D CAD documentation
- Drawing modifications
- CAD design workflows
- Sharing editable drawing information
When requesting DWG preparation or modification, it is useful to provide the source file, dimensions, revision information, and required output.
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STEP is commonly used for exchanging 3D CAD geometry between different CAD systems.
It is often useful when working with:
- Mechanical parts
- Brackets
- Mounting plates
- Enclosures
- Prototypes
- General 3D CAD models
A STEP file can preserve 3D model geometry in a way that is useful for exchanging models between different CAD applications.
When requesting a STEP file, provide the relevant dimensions, geometry references, and required features.
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STEP is commonly used for exchanging 3D CAD geometry between different CAD systems.
It is often useful when working with:
- Mechanical parts
- Brackets
- Mounting plates
- Enclosures
- Prototypes
- General 3D CAD models
A STEP file can preserve 3D model geometry in a way that is useful for exchanging models between different CAD applications.
When requesting a STEP file, provide the relevant dimensions, geometry references, and required features.
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A PDF is not normally the same type of editable CAD file as STEP, DWG, or DXF.
However, PDF drawings can be useful references for CAD preparation.
A PDF may contain:
- Dimensions
- 2D views
- Drawing annotations
- Notes
- Profiles
- Technical information
PDF quality can vary.
Some PDFs contain vector drawing information, while others may be scanned images.
The available information should therefore be reviewed before determining what CAD output can be prepared.
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CAD File Formats
Choosing the right CAD file format can make it easier to share drawings, prepare models, modify existing files, or continue into a manufacturing workflow.
Different formats are designed for different types of CAD information.
SYNCCAD can help prepare eligible CAD files based on your source references, requested changes, and required output format.
Which CAD Format Should You Choose?
The best format depends on the intended workflow.
| Format | Common Use | Typical CAD Information |
|---|---|---|
| DXF | 2D profiles and cutting workflows | 2D geometry |
| DWG | CAD drawings | 2D drawing information |
| STEP | 3D CAD exchange | 3D geometry |
| STL | 3D printing and mesh workflows | Triangular mesh |
| Drawing/reference | Visual or drawing information |
This table is a general guide. The correct format for a particular job depends on the source file, requested output, and intended use.
2D or 3D?
One of the easiest ways to choose a CAD format is to first determine whether you need 2D or 3D information.
For 3D CAD
Formats such as STEP and STL may be appropriate depending on the workflow.
Examples:
- Mechanical parts
- Enclosures
- Prototypes
- 3D printed models
- Basic assemblies or components
For 2D CAD
Formats such as DXF and DWG may be appropriate depending on the workflow.
Examples:
- Flat profiles
- Plates
- Brackets
- Panels
- Technical drawings
- Laser-cut geometry
Source Format
vs. Output Format
The file you have is not always the format you ultimately need.
For example, you may have:
PDF → DXF
or:
STEP → STL
or:
DWG → DXF
The source file provides the starting information, while the output format determines how the resulting CAD file will be used.
When submitting a conversion request, clearly identify:
- The source file
- The required output format
- Any specific geometry that must be preserved
- Important dimensions or units
- The intended workflow when relevant
What Should You Provide?
When submitting a CAD format request, provide as much relevant information as possible.
Geometry Requirements
Identify important:
- Profiles
- Holes
- Slots
- Features
- Surfaces
- Mounting locations
Intended Use
If relevant, tell us whether the file will be used for:
- CAD editing
- Laser cutting
- CNC machining
- 3D printing
- Prototyping
- Documentation
- Another workflow
The intended use can help clarify what information is important.
Dimensions and Units
Provide important dimensions and identify whether the drawing uses mm, inches, or another unit.
Required Format
Tell us which format you need.
Source File
Upload the original file or reference.
Common CAD Format Problems
A file may appear correct but use the wrong scale or units.
Important profiles, holes, slots, or features may not be included.
2D CAD files may contain overlapping or duplicated lines.
Some workflows require closed profiles, but the source geometry may contain gaps.
A PDF, image, or sketch may not contain enough information to recreate the requested CAD geometry accurately.
A customer may request a format without considering whether it contains the type of CAD information required for the intended workflow.
How SYNCCAD Handles CAD
Format Requests
For an eligible CAD request, the general process is:
Submit Source → Review Scope → Confirm Format & Price → Payment → CAD Preparation → Delivery
The requested output format is reviewed as part of the scope.
For Simple CAD Jobs:
$48 · 48 Hours
The 48-hour delivery period begins after payment has been received and all required references and information are complete.
Important Limitations
Selecting the correct file format does not automatically guarantee that a CAD file is suitable for manufacturing.
SYNCCAD does not guarantee:
- Manufacturability
- Structural performance
- Safety
- Material suitability
- Final tolerances
- Machine compatibility
- CNC machining results
- Laser cutting results
- 3D printing results
- Final product performance
Customers remain responsible for reviewing the final CAD file and confirming manufacturing requirements with their chosen manufacturer or qualified specialist.
Frequently Asked Questions
STEP is commonly used for exchanging 3D CAD geometry. STL is commonly used for mesh-based workflows such as 3D printing.
DXF is commonly used for 2D cutting geometry, although the exact requirements depend on the manufacturing workflow.
A PDF is generally a document or drawing/reference format rather than an editable CAD format like DWG, DXF, or STEP.
Yes, a PDF can be used as a reference for eligible CAD preparation. The available information and quality of the PDF should be reviewed first.
It depends on the intended workflow. STEP is commonly used for 3D CAD exchange, while STL is commonly used for mesh-based workflows.
Eligible conversion requests can be submitted for review. The source file, required output format, and conversion requirements should be clearly identified.
Need a CAD File Prepared?
Not sure which format you need, or already have a source file that needs to be converted?
Submit your references and let SYNCCAD review the CAD request.
Simple CAD Jobs · $48 · 48 Hours
For eligible Simple CAD Jobs, the 48-hour delivery period starts after payment has been received and all required references and information are complete.