> For the complete documentation index, see [llms.txt](https://docs.getcelsius.net/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.getcelsius.net/authentication/hwid-binding.md). # HWID Binding How a key locks to your hardware. A **hardware ID (HWID)** is a fingerprint of your PC. When your key authenticates successfully for the first time on a machine, the key is **bound to that machine's HWID**. ## Why it exists Binding is what stops one key from being shared across unlimited PCs. After binding, the key only authenticates from the hardware it was bound to. ## What counts as "your PC" The binding uses a hardware fingerprint. Changing components such as a motherboard or drive can alter the fingerprint and look like a different PC. If that happens, your key may stop authenticating until you [reset your HWID](/authentication/resetting-your-hwid.md). ## What does not change the binding Reinstalling Roblox, reinstalling your executor, or reinstalling Windows generally does not change the hardware fingerprint and will not unbind your key. --- # Agent Instructions This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com. ## Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation by asking a question. Perform an HTTP GET request on the following URL with the `ask` and `goal` query parameters: ``` GET https://docs.getcelsius.net/authentication/hwid-binding.md?ask=&goal= ``` `ask` is the immediate question: it should be specific, self-contained, and written in natural language. `goal` is what the user is ultimately trying to achieve, the reason they need the answer. Sharing it helps GitBook give you a better, more relevant answer. A goal is most helpful when it describes the outcome the user wants rather than restating the question. For example, with `ask=how do I create an API token`, a goal like `automate deployments from our CI pipeline` lets GitBook tailor the answer to that use case. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.