File Upload Sources

Supported formats, size and text limits, and how each file type is processed.

Note: Automated web research runs during first draft generation (if enabled in the brief), not as a separate step with source cards before you click Generate content.

Upload files directly as sources when you have documents that are not publicly accessible online.

Supported formats

PDF
TXT
MD (Markdown)
DOC
DOCX

Limits

Maximum file size: 10MB
Maximum extracted text: 15,000 characters (longer files are truncated)

What happens after upload

Text files (TXT, MD): Read directly as UTF-8 text
Word documents (DOC, DOCX): Processed using mammoth to extract raw text
PDFs: Sent to Claude's vision model to extract all text content while preserving structure