Architects and engineering teams work daily with complex CAD drawings that contain critical information about buildings, infrastructure, and construction projects.

However, integrating CAD viewing into web applications has traditionally required heavy desktop software or expensive third-party tools.

Modern .NET applications can now embed a CAD viewer directly in the browser, allowing architects and stakeholders to open DWG, DXF, and DGN files instantly without installing AutoCAD or other desktop software.

This is exactly what the Doconut CAD Viewer enables.

You can explore the online viewer here:

The Challenge: Viewing CAD Files in Web Applications

Architecture firms often build internal systems such as:

project management portals
construction documentation platforms
engineering collaboration tools
digital building archives

But CAD files are not easy to handle inside web applications.

Formats like DWG, DXF, and DGN contain complex vector geometry, layers, dimensions, and annotations. Traditionally, viewing these files required installing specialized desktop tools.

For web platforms used by architects, contractors, and clients, this creates several problems:

Not every user has AutoCAD installed
Installing CAD software on every workstation is expensive
Mobile access becomes almost impossible
Sharing drawings with clients becomes complicated

A browser-based CAD viewer solves these issues.

Introducing the Doconut CAD Viewer

The Doconut CAD Viewer allows users to open engineering drawings directly inside a web application without installing any software.

The viewer supports major CAD formats including:

Because rendering happens on the server, a drawing opens on any machine with a browser — a site tablet, a client's laptop, a phone — without AutoCAD anywhere in the picture.

On the free viewer at Doconut.app, CAD uploads stop at 10 MB. That is the lowest ceiling on the site apart from plain text, and deliberately so: drawings are dense. A file over the limit is refused outright rather than left to time out, and purging unused blocks or saving out the single sheet you need is usually enough to get it through. Inside your own application the limit is whatever your application sets.

Key Features for Architecture Workflows

High-Precision Rendering

Architectural drawings require extremely accurate rendering.

The viewer preserves details such as:

geometry
dimensions
annotations
line weights

This ensures that architectural plans appear exactly as intended.

Layer Visibility Control

CAD files often contain dozens of layers.

For example:

structural layers
electrical systems
plumbing networks
furniture layouts

The viewer allows users to toggle layers on or off, making it easier to analyze specific parts of the design.

This is particularly useful when reviewing large building plans.

Measurement Tools

Architects frequently need to inspect measurements directly within drawings.

The CAD viewer provides tools to measure:

distances
angles
areas

This allows engineers and architects to validate design elements directly in the browser

Real Use Cases in Architecture Applications

Embedding a CAD viewer in a .NET platform changes what a project portal can do.

Architecture Project Portals

Architecture firms can allow clients to view building plans directly inside project portals.

Benefits include:

no CAD software required for clients
easy review of design revisions
faster project communication

Construction Documentation Platforms

Construction teams often need to access updated drawings on site.

With a browser-based viewer:

drawings can be opened on laptops or tablets
teams can review plans directly on the construction site
no specialized CAD software is required

Digital Building Archives

Architecture firms maintain large archives of technical drawings.

With a CAD viewer integrated into a document system, users can:

search projects
preview drawings instantly
avoid downloading large files

Simple Integration into .NET Applications

The Doconut viewer is designed for developers building modern web platforms.

It integrates easily into:

ASP.NET Core
ASP.NET MVC
Blazor
WebForms

Developers can embed the viewer directly into their application and allow users to open CAD drawings alongside other document formats.

The viewer supports 75 extensions across 18 families, including PDF, Office files and CAD drawings, which is what makes it usable as the single viewer behind an enterprise document platform.

Secure CAD Viewing

Architecture drawings often contain confidential design information.

Two different answers apply, depending on which product you are using:

On the free site, uploads travel over HTTPS and the drawing is deleted once you have viewed it. No copy is kept, and there is no account it could be attached to.
In the SDK, the drawing never goes anywhere at all. It is installed in your own environment and makes no calls to Doconut servers, so a floor plan under NDA stays inside the boundary your firm already controls.

For confidential work the second is the one that survives a client's security questionnaire.

Conclusion

Architectural projects depend heavily on CAD drawings, but traditional workflows require specialized software and complex file sharing.

By embedding a CAD viewer inside a .NET web application, architecture firms can make technical drawings accessible to everyone involved in a project.

With support for DWG, DXF, and DGN files, high-precision rendering, layer control, and measurement tools, the Doconut CAD Viewer provides a powerful solution for modern architecture platforms.

To see the viewer in action or integrate it into your application:

Try the online viewer at https://doconut.app
Download the SDK at https://doconut.com

Test it with a real drawing before you decide. A sample DWG will always render; a survey with forty layers and an external reference is the file that tells you something.