The Grok file upload limit is 150 MB per file for most documents, images, code and audio files, according to the official Grok website and apps FAQ.
As of November 10, 2026, you can attach up to about 100 files in a single message on grok.com and up to 20 files on Android, while the iOS app supports multiple files without a published number. The FAQ says limits can vary slightly by platform or subscription and does not list separate file limits for free and paid plans. Grok shows an error message when a file goes over a limit.
Very long files may be summarized or handled in sections, and for PDFs over 100 pages Grok focuses on text and key visuals, so splitting very large documents helps. Developers using the xAI Files API work with a separate limit of 512 MB per file, per the xAI Files documentation.
Related: Grok usage limits: how much can you use on each plan?, What is the Grok context window? and What is the ChatGPT file upload limit?
Source: xAI Docs, FAQ for the Grok website and apps and xAI Docs, Files overview
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