View CAD files in 3D right in Chrome, as you download them or from your computer, and check machined parts for manufacturability.
Users
81
+81 in 30 days
Rating
5.0 / 5
+5.00 in 30 days
Ratings
1
+1 in 30 days
Store rank
#91K
#76K among extensions
Version
1.2.0
updated 16 Oct 2026
Users
monthly, 1 months
Latest, 19 Oct 2026:81 usersMove the mouse over the chart for any month
Ratings count
monthly, 1 months
Latest, 19 Oct 2026:1 ratingsMove the mouse over the chart for any month
The Chrome Web Store rounds user counts down to the leading digit, so the user line moves in steps. The ratings count is exact and is the better signal of real adoption.
About Toolpath CAD Viewer
Click a link to a CAD file and see the part in 3D, right in Chrome. Toolpath CAD Viewer opens STEP files and other common CAD formats in the Toolpath 3D viewer as you download them, and still saves the file to your downloads. A local CAD file can also be opened in the viewer or drag and dropped directly into your browser.
No account is needed to view parts.
OPENS FILES HOWEVER THEY ARRIVE
• Links to CAD files open in a new tab beside the page.
• Files a website builds and saves for you, and downloads the server names, open too.
• Choose which file types open in the viewer on the options page.
LOOK AT THE PART
• Orbit, pan and zoom with the mouse controls of the CAD program you already use.
• Section view: cut the part open and slide the cut through it.
• Measure faces, holes and points, snapping to corners and edges.
• Show the stock, axes, a 5 mm grid or a banana for scale, or switch to wireframe.
• See the part's size in millimeters or inches, in light or dark mode.
CHECK IT FOR MANUFACTURABILITY (DFM)
Add a Toolpath API key and the DFM check runs as each part opens. It finds the machined features on the part, such as holes and pockets, and checks each one against your rules.
• Standard checks to start from: deep features, features that need a very small tool, features far below the top of the part, and sharp inside corners.
• Change any rule in place, add your own, import and export rule sets, or copy a prompt that has an AI assistant write a rule set for you.
• Faces that break a rule take that rule's color on the part.
• Click a feature for its details: its measurements, milling considerations, the rules it breaks and its reach. Zoom to it, isolate it, or Shift-click faces to compare them.
• See the widest tool that fits where a feature is tightest, point at any feature to name it, and color the part by the direction each face is machined from.
• Tips on first use walk you through the rules, the colors and the feature details.
Get an API key at portal.toolpath.com.
HOW IT WORKS AND YOUR DATA
The CAD file you open is sent to the Toolpath Engine, which turns it into a lightweight 3D mesh for the viewer. Only that file is sent; nothing else on the page is read. Viewing is free and needs no sign-up. If you have a Toolpath account, paste your API key on the settings page and the parts you open are kept under your account.
Toolpath is a cloud platform for CNC machining: DFM feedback, quoting and toolpaths from a CAD file. Learn more at https://toolpath.com.