Questions

It hides an invisible signature in your 3D print files and registers each design to you. When you find a copy somewhere, you upload it to Ghostly and it tells you whether it's yours and which copy it came from.

In a way: a watermark you can't see, plus a registration of your design. Unlike a logo or text added to the model, it doesn't change how the model looks.

3MF and STL, or a ZIP of them, up to 150 MB per upload. Signed copies come back in the same format you uploaded.

About two minutes for a small model. Large, detailed models take longer. You can close the page and come back.

No. Every signed copy is sliced and compared with your original before you get it. If signing would change how a copy prints, Ghostly leaves the hidden part of the signature out of that copy and tells you. That copy is still registered and labeled to you, and it prints exactly like your original.

No. There's no logo, no text and no extra part, and nothing changes on the surface of the print.

Never. Ghostly makes new signed copies and leaves your original alone.

A separately signed version of the same design for one place you sell. If you sell on your own shop, Etsy and Patreon, you make three copies, and a check tells you which of the three a file came from.

You get one of three answers: Signed (the owner, the design and the exact copy), Registered design (it matches a registered design but carries no signature, like a copy that was never signed), or No match.

Edited files still work. Ghostly is built to recognize your design after the kinds of changes people make to files they didn't create. In our tests it traced every changed file back to its design, and in most cases to the exact copy.

Yes. Any account can check any file. If it's signed, you see whose it is. Checks never show anyone your files.

Nothing hidden in a file is impossible to remove, and we won't pretend otherwise. Ghostly makes it hard: each file carries several separate kinds of proof, and the everyday edits people make don't remove them.

Because a signature with public instructions is a signature someone can learn to strip or fake. We're open about what Ghostly does and what it can't do. How it does it stays private.

No tool can stop a determined person from sharing a file. Ghostly makes it provable that a copy is yours and shows which copy it was, so you can act on it with evidence.

Not today. Ghostly gives you the evidence: the owner, the copy and the date the design was registered, plus a certificate for each design.

Ghostly keeps what it needs to recognize your designs when someone checks a file. Your files are never shared, sold or used for anything else.

Files you've signed stay signed and your designs stay registered to you. Checking needs an account, and the free plan always includes checks.

Independent 3D print designers who sell files of our own. We built Ghostly for our own files first. More about us.

Create a free account and sign your first design. The free plan includes three designs and ten checks a month. Start free.