"Replace Old Corp with New Corp everywhere, and set the effective date to May 1, 2026."
One message, and Claude or ChatGPT walks through the contract and changes every match. The same chat can fill in a form, turn one line of text into an invoice, merge a stack of PDFs into one, or find the contract that renews automatically. It all happens in your pdf.net library, and you never leave the chat.
The pdf.net connector makes that possible. It gives Claude and ChatGPT direct access to your library, so the chat works as an AI PDF editor. And it's free.
Editing the text
The pdf.net editor opens inside the chat. Your document loads there first. Then Claude or ChatGPT changes paragraphs one at a time, keeping the original fonts where it can. Give the result a quick read before you send it.
What you can change:
- Text in any paragraph, plus alignment (left, center, right), line height, and first-line indent
- Text blocks: add, move, or remove them
- Pages: add, remove, duplicate, or reorder them
- Styling inside a line: bold, italic, superscript, and subscript
- Form fields: fill them in
You don't have to point at paragraphs. "Update the dates on these invoices and change our address to the new one" is enough. Finding them is its job.
Creating a document from a description
Type "Payment invoice, Acme LLC, $15,000, software development, October 2026" and a PDF comes back. That's the whole prompt. If you need more control, write more: which clauses go in, what language, how formal. It works as an AI PDF generator for invoices and contracts, or for anything else you can describe. The file goes to your library. Ask for a download link when you need one.
For invoices, this has been a lifesaver. I work with a lot of contractors, so I need a lot of invoices. I upload my template and a table with everyone's details, then go do something else. A couple of minutes later, there are 10 to 15 named invoices ready, each with the data I need. Basically, mail merge for PDFs.
Merge, split, compress, and convert
The file tools work from chat too, with these limits:
- Merge: 2 to 20 documents, up to 100 MB combined
- Split: up to 50 page ranges per call, numbered from 1, where "6-z" means page 6 to the end
- Compress: 3 levels
- Convert: 18 formats, including DOCX, XLSX, PPTX, EPUB, CSV, PNG, and JPG. When one PDF becomes many files, you get a ZIP
- Download links: single-use, expire after 10 minutes
- Import from a URL: the link has to lead to the file itself, with no login page in the way
Merge, split, compress, and imports never touch the original. Each saves a new document, so if you retry, expect a duplicate. Edits in the editor are different: they change the document itself.
Working in your library
The connector sees your whole pdf.net library. It can make folders, move files between them, rename, copy, and delete. To organize PDF files, one line does it: "Create folders for Contracts, Invoices, and Reports, then sort what's here by type."
Search works on meaning rather than exact words. Think chat with PDF, but over the whole library. Ask which contracts renew automatically, and the answer comes with up to 10 matching pages, grouped by document. You can narrow it to a few files if you want. It only covers documents pdf.net's AI has already read, such as ones you've used in AI chat on pdf.net, so a fresh upload may not show up.
Careful with folders, though. Delete one and everything inside goes to trash too. You can get it back from trash in pdf.net in the browser.
Where your files sit
In your pdf.net account. The connector can't see your email, your calendar, or anything else you've connected. Only the library.
- Access: tools only work inside the account you signed in with. Other people's documents are out of reach
- Encryption: TLS in transit, AES-256 at rest
- Your documents: pdf.net doesn't sell them or use them to train AI models. What Claude or ChatGPT reads falls under Anthropic's or OpenAI's terms
- Disconnecting: any time, from the same settings you used to connect
What still opens the editor
Some things still need the pdf.net editor in your browser: signing and signature requests, annotations of any kind (freehand, shapes, highlights, images), page numbers, passwords, public links, adding or moving form fields, and inviting collaborators. Ask for one in chat, and you'll get a link that opens the document there.
Connecting it
Where to find it:
- In Claude: Settings, then Connectors, where your other Claude integrations sit. Search for pdf.net and click Connect
- In ChatGPT: Settings, then Connected apps
You'll be asked to sign in to pdf.net once. From then on, it's just there in new chats, on any plan, including free.
If you get stuck, the help center walks you through it step by step. For the complete tool list, see the MCP server page.
Where to start
Pick a PDF you need to change anyway and ask for the change in one message. If something doesn't go the way you expected, tell us at support@pdf.net.