Papermark

Papermark is an open-source and self-hostable secure virtual data room and document sharing platform built for M&A, fundraising, due diligence, and confidential document sharing. It provides page-by-page engagement analytics, dynamic watermarking, one-click NDA gating that requires acceptance before document access, and granular folder and file permissions with an append-only audit log. It also includes a Q&A module, file requests, AI redaction capabilities, screenshot and password protection, an AI-powered data room assistant for document queries, and full API, CLI, and MCP server access for programmatic control. Data Rooms start at €99/month (or the equivalent of $119 annually) up to €999/month for unlimited access, while lighter document sharing ranges from free to €59/month, with a 7-day free trial of the Plus tier requiring no credit card.