Simulink Viewer

Simulink from MathWorks is how most control, automotive, aerospace and power electronics engineers build and simulate systems, and almost every engineering college teaches it. Its models are .slx files (or .mdl in older releases), and they get passed around all the time: a lab assignment from a professor, a reference design from a supplier, a project handed over by a colleague who left, a model attached to a research paper or a GitHub repository. Opening one normally needs a MATLAB and Simulink licence on a Windows, Mac or Linux PC. On a phone, a Chromebook, a laptop without the licence, or when you only want a quick look before a meeting, there is nothing to open it with.

This page reads the model file itself and draws it the way Simulink lays it out. Blocks sit where they were placed with their names under them, and the common ones get a familiar icon: gains as triangles with their value, sums as circles with their signs, integrators as 1/s, transfer functions as a fraction in s or z, inports and outports as numbered ovals, Goto and From tags, Mux, Scope, Step, Saturation and more. Signal lines keep their bends, branch points, arrows and names, and notes written on the canvas show too.

Every level of the model is there. Subsystems list their port names on the box and open to the diagram inside, as deep as the model goes. Stateflow charts are drawn with their states, transitions, conditions and junctions, MATLAB Function blocks and truth tables show their code, and you can copy that code with one button. Click any block to see its settings exactly as stored, for example Gain 1/1200 or Initial condition 20, along with the library block it came from. The summary above the diagram tells you the release that last saved the file, who saved it and when, and the solver and stop time.

We tested it on 239 public models, from small lab models to a vehicle model with 733 subsystems and 6,839 blocks, saved by Simulink releases from R2007 to R2025b. All of them opened, and the largest one was read in about a third of a second on a laptop. Models open the same way on Windows, macOS, Linux, ChromeOS, Android and iOS.

Your model never leaves your device. The file is unpacked and read by code running in this tab, and the PDF, images and CSV are made on your computer too. There is no upload, no account and no AI model, so confidential designs and unpublished coursework stay private. Closing the tab clears everything.

This is a viewer, not a simulator. It does not run the model, show scope plots or let you edit anything. Masked blocks show their name instead of custom mask artwork, blocks from libraries or referenced models outside this file show as a labelled box, and protected models (.slxp) stay locked because MathWorks encrypts them. Simulink and Stateflow are trademarks of The MathWorks, Inc. TaskNinja is not connected to MathWorks.