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AI model terms

These terms apply when you use the AI photo to 3D tool on pixstl (previews, new versions and downloads of AI models). They form part of the pixstl Terms of Service. By generating a preview or downloading an AI model, you agree to them.

pixstl is operated by flreey (Hong Kong). pixstl is not affiliated with, sponsored by or endorsed by Tencent.

Which AI models we use

  • Tencent Hunyuan3D 2.1 (shape model), run on our own servers. Tencent Hunyuan 3D 2.1 is licensed under the Tencent Hunyuan 3D 2.1 Community License Agreement, Copyright © 2025 Tencent. All Rights Reserved. The trademark rights of “Tencent Hunyuan” are owned by Tencent or its affiliate.
  • TripoSG (MIT licence), used for photos Hunyuan3D cannot build, such as close-ups.

Every model is repaired into a closed, printable solid by pixstl after generation. The model shown in My models tells you which one made it.

Use restrictions

Models made with Hunyuan3D 2.1 are subject to the use restrictions in Sections 5(a) and 5(b) of its licence. You agree that:

  1. You will use the tool and its models in line with applicable laws, including trade compliance laws, and the licence’s Acceptable Use Policy. Among other things it rules out using the models to harm people or minors, to defame, harass or impersonate anyone, to promote violent extremism or discrimination, and for military purposes.
  2. You will not use any model or other output of the tool to train or improve any other AI model.
  3. If you publish a model, or an image or render of it, in a public context, you will say clearly that it was made with AI.
  4. If you pass a model on to someone else, you will tell them that these restrictions apply to it.

Where the tool may be used

The Hunyuan3D 2.1 licence does not cover the European Union, the United Kingdom or South Korea, and its Acceptable Use Policy rules out use outside the territory it covers. Do not use the AI photo to 3D tool, or models made with it, if you are in one of those places. The free relief, lithophane and converter tools are not affected.

Your photos and your models

Only upload photos you have the right to use. Photos are deleted 24 hours after upload; models are kept for 30 days so you can download them again (see the Privacy Policy). Within these restrictions, a model you paid to download is yours to print, sell as a print or use in your own products.

Questions: hello@pixstl.com.