Check a DXF online
Drop a flat cut file below and get a specific answer about its geometry: which contour is open, which segments are duplicated, whether the units are actually declared. No account, no upload, no install.
Drop a .dxf here
The file is read by your own browser. It is not uploaded, and it does not leave your computer.
How this can be free and private at the same time
The checker is a self-contained piece of code that your browser downloads once and then runs on your own machine. Your file is read by the tab you are looking at and never sent anywhere, so there is nothing to store, leak, or retain — and no server cost to recover, which is why it can be free.
You do not have to take that on trust. Open your browser’s developer tools, switch to the Network tab, and drop a file in: no request is made. That is a claim you can check in ten seconds, which is the only kind worth making about a file you cannot share.
That matters if the part is a customer’s, under NDA, or otherwise not yours to paste into someone else’s web service. This page counts visits, like any website, but it never sees your drawing — see the privacy policy.
What this page checks
- Open contours, including gaps far too small to see on screen
- Duplicate, partially overlapping and crossing cut paths
- Zero-length segments
- Whether the file declares its drawing units, rather than guessing for you
- Entity types outside the checked scope, named and counted
A file containing geometry it did not analyse can never come back PASS. If it meets something outside its scope, it says so and refuses to certify. That refusal is the point — a false “ready to cut” is paid for in material.
Limits, stated plainly
- ASCII, model-space DXF only. No DWG, no binary DXF, no paper space, no xrefs.
- Built for clean flat cut files. Arbitrary complex CAD is out of scope and will usually report as incomplete rather than pretend otherwise.
- It does not edit or repair anything. It tells you what is wrong; you fix it upstream.
- This page checks geometry but does not draw it. The Chrome extension renders the drawing and marks each defect on it.
Want the drawing as well?
The extension does everything this page does, plus it renders the part and puts a marker on every defect so you can step through them. Same checks, same local-only guarantee, no permissions requested.
Free. No account, no sign-in, and no permissions requested. Your drawing is never uploaded.