View, edit, redact, fill, and annotate PDFs directly inside Claude Cowork. Drive the viewer yourself, ask Claude to do the work, or both — in the same session. Claude reads PDFs on its own; this extension is what lets it edit them — visually, in place, on the original file.
BUILT FOR CLAUDE COWORK
Claude can already read PDFs. With the Nutrient PDF Editor, it can also work on them — visually, page by page, with the same editor surface you'd expect from a professional PDF tool.
A professional PDF viewer renders directly in Claude's chat panel, with smooth scrolling, zoom, search, and high-fidelity rendering for complex documents.
Mark and apply real, permanent redactions for PII, financial data, or sensitive clauses — driven by prompt or by hand, with the burn-in step kept under your control.
Open AcroForm PDFs and fill text fields, checkboxes, and dropdowns — yourself, or by asking Claude to populate fields from context you've already shared.
Highlight clauses, add comments, draw shapes, and sign documents. Every annotation is a real PDF annotation that travels with the file.
TWO MODES, ONE DOCUMENT
Edit the PDF the way you would in any PDF editor — highlight, redact, fill, sign — using the viewer's own UI. Or describe what you want in plain English and Claude executes the work using the same tools, with changes appearing in the viewer in real time. Switch between the two at any point in the same session.
Use the toolbar to highlight, redact, draw, fill forms, and sign — exactly as you would in a standalone PDF editor.
Ask Claude to redact every email address, highlight every liability clause, or fill a form from context you've already shared.
Take over from Claude or hand back to it without losing your place. The document stays live throughout.
Edits save back to the original file on disk. Annotations and redactions are real PDF objects, not screenshots or overlays.
WORKFLOWS
Highlight clauses with AI
Claude finds and visually highlights matching language across the full document, not just the first page.
Redline alongside the AI
Add your own annotations and comments to the same PDF in the same session.
Built for legal PDF review
Designed for the long, complex documents legal and contract teams actually deal with.
Output stays in the file
Highlights save back into the original PDF — no separate report, no lost context.
Redact PII in Claude
Common identifiers covered — emails, phones, account numbers, names — plus free-form prompts for anything else.
Review before applying
Marked redactions stay reviewable until you confirm the irreversible apply step.
Real, permanent redactions
When applied, the underlying content is removed from the PDF — not just covered with a black box.
On-device by design
The PDF never leaves your machine. Sensitive content stays local end to end.
AI form filler for PDFs
Text fields, checkboxes, radio groups, and dropdowns — all populated from natural-language context.
Standard PDF forms
Works with AcroForm-based PDFs from government, finance, HR, and operations workflows.
Manual override anywhere
Click into any field to correct or refine what Claude filled in.
Save back to the file
Filled values persist as proper form data inside the PDF, not as flattened text.
Extract data from PDFs
Find figures, dates, named entities, and patterns across the full document.
Verifiable in the viewer
Every extracted value is highlighted on its page, so you can confirm the source.
Long documents are fine
Built on a PDF engine that has rendered thousand-page documents in production for over a decade.
Iterate by prompt
Refine the extraction by asking again — narrower terms, different sections, alternative phrasing.
Comments, highlights, shapes
The full annotation toolset — text notes, ink, shapes, stamps, and signatures — all available to Claude and to you.
Real PDF annotations
Saved as standard annotations that any PDF reader (Acrobat, Preview, Chrome) can open.
Mix human and AI markup
Edit, delete, or extend any annotation Claude creates — and Claude can pick up from yours.
Round-trips with other tools
External edits in Acrobat or Preview sync back into the viewer automatically.
Highlight clauses with AI
Claude finds and visually highlights matching language across the full document, not just the first page.
Redline alongside the AI
Add your own annotations and comments to the same PDF in the same session.
Built for legal PDF review
Designed for the long, complex documents legal and contract teams actually deal with.
Output stays in the file
Highlights save back into the original PDF — no separate report, no lost context.
Redact PII in Claude
Common identifiers covered — emails, phones, account numbers, names — plus free-form prompts for anything else.
Review before applying
Marked redactions stay reviewable until you confirm the irreversible apply step.
Real, permanent redactions
When applied, the underlying content is removed from the PDF — not just covered with a black box.
On-device by design
The PDF never leaves your machine. Sensitive content stays local end to end.
AI form filler for PDFs
Text fields, checkboxes, radio groups, and dropdowns — all populated from natural-language context.
Standard PDF forms
Works with AcroForm-based PDFs from government, finance, HR, and operations workflows.
Manual override anywhere
Click into any field to correct or refine what Claude filled in.
Save back to the file
Filled values persist as proper form data inside the PDF, not as flattened text.
Extract data from PDFs
Find figures, dates, named entities, and patterns across the full document.
Verifiable in the viewer
Every extracted value is highlighted on its page, so you can confirm the source.
Long documents are fine
Built on a PDF engine that has rendered thousand-page documents in production for over a decade.
Iterate by prompt
Refine the extraction by asking again — narrower terms, different sections, alternative phrasing.
Comments, highlights, shapes
The full annotation toolset — text notes, ink, shapes, stamps, and signatures — all available to Claude and to you.
Real PDF annotations
Saved as standard annotations that any PDF reader (Acrobat, Preview, Chrome) can open.
Mix human and AI markup
Edit, delete, or extend any annotation Claude creates — and Claude can pick up from yours.
Round-trips with other tools
External edits in Acrobat or Preview sync back into the viewer automatically.
Open a contract in Claude and ask it to mark every clause that mentions liability, indemnification, or termination. Claude reads the document, highlights the matches in the viewer, and you can review, edit, or extend the markup yourself.
CAPABILITIES
Highlight clauses with AI
Claude finds and visually highlights matching language across the full document, not just the first page.
Redline alongside the AI
Add your own annotations and comments to the same PDF in the same session.
Built for legal PDF review
Designed for the long, complex documents legal and contract teams actually deal with.
Output stays in the file
Highlights save back into the original PDF — no separate report, no lost context.
Ask Claude to redact every email address, phone number, account number, or name in the document. Claude finds the matches, marks them for redaction, and you apply the redactions when you're satisfied — with the irreversible burn-in step kept under your control.
CAPABILITIES
Redact PII in Claude
Common identifiers covered — emails, phones, account numbers, names — plus free-form prompts for anything else.
Review before applying
Marked redactions stay reviewable until you confirm the irreversible apply step.
Real, permanent redactions
When applied, the underlying content is removed from the PDF — not just covered with a black box.
On-device by design
The PDF never leaves your machine. Sensitive content stays local end to end.
Drop a W-9, an intake form, or any AcroForm PDF into Claude and ask it to fill the fields using the company or candidate details you've already shared. Claude maps your context to the right fields and fills them in the live viewer — and you can correct any field by hand.
CAPABILITIES
AI form filler for PDFs
Text fields, checkboxes, radio groups, and dropdowns — all populated from natural-language context.
Standard PDF forms
Works with AcroForm-based PDFs from government, finance, HR, and operations workflows.
Manual override anywhere
Click into any field to correct or refine what Claude filled in.
Save back to the file
Filled values persist as proper form data inside the PDF, not as flattened text.
Point Claude at a 10-K, a research paper, or a multi-hundred-page report and ask it to find every revenue figure, citation, or specific data point. Matches are highlighted in the viewer so you can verify the source page-by-page, not trust a summary.
CAPABILITIES
Extract data from PDFs
Find figures, dates, named entities, and patterns across the full document.
Verifiable in the viewer
Every extracted value is highlighted on its page, so you can confirm the source.
Long documents are fine
Built on a PDF engine that has rendered thousand-page documents in production for over a decade.
Iterate by prompt
Refine the extraction by asking again — narrower terms, different sections, alternative phrasing.
Ask Claude to add comments to a methodology section, summarize each chapter in the margin, or flag every unclear passage with a sticky note. Use AI document annotation for first-pass review, then refine the markup yourself.
CAPABILITIES
Comments, highlights, shapes
The full annotation toolset — text notes, ink, shapes, stamps, and signatures — all available to Claude and to you.
Real PDF annotations
Saved as standard annotations that any PDF reader (Acrobat, Preview, Chrome) can open.
Mix human and AI markup
Edit, delete, or extend any annotation Claude creates — and Claude can pick up from yours.
Round-trips with other tools
External edits in Acrobat or Preview sync back into the viewer automatically.
WHY NUTRIENT
The Nutrient PDF Editor for Claude Cowork is built on Nutrient Web SDK — the same PDF engine deployed in production by enterprise teams for over a decade.
The same PDF engine that has shipped in legal, financial, aerospace, transit, and government workflows for more than ten years — handling encrypted files, complex forms, scanned pages, embedded fonts, and the edge cases that break lightweight viewers.
The viewer runs entirely on your machine — no server, no upload step. Documents are never sent to Nutrient or to any third-party for rendering. The original file on disk stays the live document throughout.
Annotations, redactions, form filling, signatures, and content edits — all operate on the real PDF. The Nutrient PDF Editor for Claude is the editor, not a passive preview pane.
PROVEN AT SCALE
INSTALL & UPDATE
Download the extension, restart Claude Desktop once, and open a PDF inside Claude Cowork. Updating follows the same steps — download the latest file and restart.
Download the installer file from GitHub and double-click it. Claude Desktop will prompt to install.
A one-time restart is required after installing. We're working with Anthropic to remove this step.
In Claude Cowork, point Claude at a folder with a PDF and ask it to open the document. The viewer renders inline in the chat panel.
Yes. Claude has native multimodal PDF reading — it processes both the text and the visual layout of pages, and can summarize, cite, and extract data without any extension.
The Nutrient PDF Editor adds a different capability on top: a real,
interactive PDF viewer inside the chat panel where Claude (or you)
can highlight, redact, fill forms, annotate, and sign documents in
place — on the original file on disk — instead of generating a new
PDF as output.
Claude Cowork shows basic file previews when you attach a PDF, but it has no professional viewer or editor surface — no annotation tools, no form fields, no redaction, no signatures. The Nutrient PDF Editor adds a full PDF editor inside Claude Cowork: pixel-perfect rendering, annotations, forms, redaction, and signatures, all in a real toolbar that you or Claude can drive.
Claude can edit PDFs natively by running code in its sandbox — it reads the document, processes it, and produces a new file as output. You don't see the edit happen, and the result is a regenerated PDF rather than changes to the original.
The Nutrient PDF Editor adds visual, in-place editing. Install the
extension, restart Claude Desktop once, then ask Claude to open the
PDF. The viewer appears in the chat panel and you can:
— Edit the document yourself using the viewer's toolbar (highlight,
redact, fill, annotate, sign), or
— Describe what you want in plain English and Claude performs the edit using the extension's tools, with changes appearing in the viewer in real time.
Edits save back to the original file on disk. Both modes work in the
same session.
Yes — Claude can fill AcroForm fields natively by running code on the PDF and producing a filled copy as output. You don't see it happen, and the result is a generated file rather than changes to the original.
With the Nutrient PDF Editor, Claude fills fields directly inside
a live viewer in the chat panel — you watch it work, override any
field by hand, and the values save back to the original file as proper
PDF form data.
Not natively. Claude has no built-in redaction tools — to actually redact a PDF, Claude needs an extension or external tool.
The Nutrient PDF Editor gives Claude a real redaction workflow: it
finds sensitive content (PII, financial data, anything you describe),
marks it for redaction, and applies real, irreversible burn-in redactions
that remove the underlying content from the PDF — not just cover it
with a black box.
Without an extension, you can attach a PDF to a chat and Claude will read it, extract data, summarize, or generate a new PDF as output. To work on the document visually — view, annotate, redact, fill, sign — install the Nutrient PDF Editor. The viewer renders inline in the chat panel. From there you can edit directly, ask Claude to do the work, or both. Edits save back to the original file on disk automatically.
Yes. Claude Code's Read tool supports PDFs on the local filesystem and works best on text-based PDFs (scanned documents need OCR). It can read and analyze PDFs but doesn't have a visual editing surface — that's the gap the Nutrient PDF Editor closes inside Claude Cowork. We'll consider expanding to Claude Code if the underlying UI capability lands there.
That's a different workflow — Anthropic's app handles exporting chats. The Nutrient PDF Editor is for working on existing PDFs inside Claude: viewing, editing, redacting, filling forms, and extracting evidence.
Yes — it's free to install and use. No payment and no signup required.
The viewer runs on your machine using WebAssembly, powered by Nutrient Web SDK. Your PDF isn't uploaded to Nutrient or to any third-party server for rendering — the file stays on disk throughout. Anything Claude itself receives as part of normal use is handled per Anthropic's privacy policy. Anonymous usage telemetry from the extension is sent to Nutrient and disclosed in our privacy policy.
