Is it free to convert between STP and DGN?

Yes, Convert999 is 100% free. All conversions happen locally in your browser with no file size limits, no registration, and no watermarks.

.stp

.dgn

STP vs DGN

Compare STEP CAD File and MicroStation Design formats — understand the key differences and when to use each

Format Overview

STP

STEP CAD File

STEP CAD File (.stp) is a cad file format.

.stpcad

DGN

MicroStation Design

MicroStation Design (.dgn) is a cad file format.

.dgncad

STP vs DGN: Feature Comparison

Feature	STP	DGN
Full Name	STEP CAD File	MicroStation Design
File Extension	.stp	.dgn
Category	cad	cad
Free to Convert	✓ Yes	✓ Yes
Browser Support	✓ All Browsers	✓ All Browsers
Convert to Each Other	✓ Yes	✓ Yes

When to Use STP vs DGN

Use STP when you need:

•Files in STEP CAD File format for maximum compatibility
•Industry-standard cad format support
•Wide software and platform compatibility

Use DGN when you need:

•Files in MicroStation Design format for specific workflows
•Optimized cad format features
•Modern format advantages and smaller file sizes

Convert Between Them

STP DGN DGN STP

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Learn More About These Formats

STP Converter DGN Converter

Frequently Asked Questions

What is the difference between STP and DGN?

STP (STEP CAD File) and DGN (MicroStation Design) are both cad file formats. STP files use the .stp extension while DGN uses .dgn. They differ in compression, quality, compatibility, and intended use cases.

Can I convert STP to DGN for free?

Yes! Convert999 lets you convert STP to DGN completely free, directly in your browser. No file upload to any server, no registration needed — your files stay private on your device.

Which is better, STP or DGN?

It depends on your use case. STP (STEP CAD File) may be better for certain workflows, while DGN (MicroStation Design) excels in others. Consider factors like file size, quality, software compatibility, and your specific needs.

Is it safe to convert files on Convert999?

Absolutely. Convert999 processes all files 100% locally in your browser. Your files are never uploaded to any server, ensuring complete privacy and security.

STP Converter

Convert from STP

DGN Converter

Convert from DGN

File Tools

Compress, resize, merge

Convert to STP

All sources → STP

Convert to DGN

All sources → DGN

Format Statistics

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Feature

STP

DGN

Full Name