FREE · PRO · NO UPLOAD
Free to check. Pro to auto-repair at volume.
Every viewer, converter and the STL checker stay free. Pro is for people who repair models regularly and want print-ready files without opening a mesh editor.
Free
$0
- ▸View and convert STL, GLB, 3MF, OBJ and more
- ▸STL health check: holes, non-manifold edges, degenerate triangles
- ▸Basic clean-up download (weld vertices, drop zero-area triangles)
- ▸Preview any automatic repair in 3D
- ▸1 auto-repaired download per browser
Pro
$9.99/month
or $79/year (about $6.58/month)
- ▸Everything in Free
- ▸Unlimited auto-repaired downloads
- ▸Hole filling, consistent winding, inside-out shells flipped
- ▸Repair runs on your device — files are never uploaded
- ▸Cancel anytime from the billing portal
Renews automatically until cancelled. Prices in USD; tax may be added at checkout.
Already subscribed? Paste your Pro key
Questions
What exactly does auto-repair change?
It welds duplicate vertices, removes zero-area and duplicate triangles, makes every triangle face the same way, closes holes by triangulating their boundary loops, and flips shells that are inside out. Added triangles are highlighted in the preview so you can inspect them before downloading.
What doesn't it fix?
Non-manifold edges (one edge shared by three or more triangles) are reported but not rewritten, because splitting them needs a decision about which surfaces belong together. Self-intersections aren't detected. Very large openings that can't be closed safely are left open and reported.
Is my file uploaded?
No. Checking and repairing both run in your browser. Payment is handled by Stripe on its own checkout page; your models never touch our server.
Can I try it before paying?
Yes. Previewing a repair is always free, and your first download of an auto-repaired file is free, so you can check it in your slicer first.
How do I use Pro on another computer?
After checkout you get a Pro key. Paste it on this page in any browser. Keep it like a password.
How do refunds work?
If Pro didn't work for your files, contact us within 14 days of a charge — see the terms. Terms.