Workplace messaging platform Fax announced this week that it will now automatically summarize documents shared in chats, allowing users to understand complex files without the inconvenience of opening them.
The feature activates whenever users upload files such as .pdf, .docx, .pptx, and .xlsx. Once a file lands in chat, Fax replaces the usual file preview with an AI-generated summary, even when the document already contains a carefully written summary from the author, who presumably knows what the document says.
"Opening a PDF can take several seconds and may even launch a different application," said a Fax product manager. "Our AI allows users to skip that step entirely."
Early demonstrations suggest the system is already delivering remarkable clarity. Claude Shannon's 60-page paper Communication Theory of Secrecy Systems was summarized by Fax as “This document discusses information and numbers.”
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Mobile-style Fax chat in #crypto-research. Professor McSmartypants uploads communication-theory-of-secrecy-systems.pdf, but the usual file preview has been replaced by a Fax AI Summary card saying 'This document discusses information and numbers.' above a button labeled Generate Different Summary.
Researchers say the feature represents a breakthrough in automatic confidence amplification: cautious academic language such as "we conjecture" and "preliminary evidence suggests" is upgraded into the more decisive "this document explains."
Fax emphasized that users remain fully in control of their reading experience. If readers dislike the AI summary, they can click "Generate Different Summary," after which the system produces another version, preserving user choice while gently erasing the original author's involvement.
"Different readers prefer different summaries," the company explained. "Fax ensures everyone can have the summary that feels right."
Fax also clarified that its AI summary is not influenced by the author's own summary, which could introduce bias. Several academic conferences have reportedly expressed interest in the technology, noting that AI summaries could eliminate the need for authors to write them at all.
Horizontal bar chart showing that perceived quality rises as the number of generated summaries increases: 1 summary scores 18, 2 scores 31, 4 scores 46, 8 scores 63, 16 scores 82, and 32 scores 97, with annotations ranging from guarded to deeply validating.
Premium Tier Removes Documents Entirely
Fax also announced an upcoming premium tier designed to reduce friction even further. The new service, Fax Premium, will let teams generate summaries before documents are written, allowing organizations to skip document creation altogether.
"Most workplace documents are eventually summarized anyway," a company spokesperson explained. "Fax Premium allows organizations to begin directly with the summary."
In early demonstrations, the system successfully generated the following summary for a document that did not yet exist: “This document outlines several ideas and proposes next steps.” Productivity experts say the feature could dramatically reduce the time employees spend writing documents no one intended to open.
Fax confirmed that summaries generated before a document exists are not influenced by the document itself, which could introduce bias. Engineers say the next version will streamline the workflow further by summarizing the AI summary itself.
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Paper
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Author summary
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AI summary
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Different AI summary
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Another different AI summary
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AI summary in chat
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Unread
Vertical flow chart with seven steps: Paper, Author summary, AI summary, Different AI summary, Another different AI summary, AI summary in chat, and Unread.
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Idea
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AI summary
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Team agreement
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Document (optional)
Vertical flow chart with four steps: Idea, AI summary, Team agreement, and Document optional.
At press time, Fax had successfully summarized a paper titled Why Automatic Summaries Are Harmful as “This document contains several concerns.”