Short answerAnthropic lists project files at 30 MB each, with no fixed file count but total content limited by Claude's context window, expanded automatically by retrieval on paid plans. Supported types include PDF, DOCX, CSV, TXT, HTML, ODT, RTF, EPUB, JSON and XLSX.
- Per file: 30 MB for project files; text is extracted (multimodal PDFs are an exception).
- Types: PDF, DOCX, CSV, TXT, HTML, ODT, RTF, EPUB, JSON, XLSX, and images (JPEG, PNG, GIF, WebP). XLSX needs code execution and file creation turned on.
- Capacity: no fixed numeric total, but content must fit Claude's context window. On paid plans retrieval switches on automatically when knowledge nears the limit, expanding capacity up to 10 times.
- Free accounts: projects are available, limited to five.
Practical advice: convert unusual formats first and split big documents: knowledge migration. Full guide: moving a GPT to Claude.
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