Best e-signature MCP servers in 2026: 9 options compared

Your assistant can draft a contract in a minute. Then the job stops at "now get Dana to sign it." An e-signature MCP server is the piece that closes that gap: it lets Claude, ChatGPT or Cursor send the document, track it, and hand you back the signed PDF.

I work at Portant, and we built one of these servers, so read the ranking with that in mind. Building it taught us which tests matter, and most of them are not on any feature list. This guide scores nine servers on those tests, says plainly where each rival beats us, and takes every rival fact from that vendor's own documentation as published in October 2026.

What an e-signature MCP server has to get right

Every server on this list can "send a document for signature." That sentence hides the parts that decide whether the job finishes. These are the six tests we use.

1. Can it sign a document the assistant just wrote? Some servers only send from a template that a person set up first. If your assistant drafts an NDA in the chat, the server should take that draft as it is.
2. Does a person confirm before the signer gets an email? A sent email cannot be unsent. A good server makes the send a clear, separate step, and the best ones say so in the tool's own metadata so the client asks you first.
3. Does it ever sign for someone? An agent that can apply a signature is an agent that a prompt injection can turn against you. Signatures should come from people, in a browser.
4. Does the signed PDF come back to you? Chat clients limit how much a tool can return, and some cannot download files at all. The answer has to be a link or an email you can actually open.
5. What does the first send cost? Count the sign-in method, a credit card, the e-signature plan, and the assistant plan. Claude's Free plan, for example, allows one custom connector.
6. Is it hosted or local? A hosted server works in claude.ai, ChatGPT and coding tools alike. A local server started with npx works only in desktop and coding clients that can run it.

Quick comparison

Prices are each vendor's own published entry price for the e-signature product, checked in October 2026. "Free plan" is the vendor's free allowance; the MCP server may need a higher plan, as each section notes.

1. Sign PDF by Portant, best for getting a document your assistant wrote signed

Hosted  ·  Email code, OAuth or API key  ·  Free plan: 30 requests a month

Sign PDF is the server we built. It does one job: you ask your assistant to get a document signed, a person signs it in a browser, and the signed PDF comes back to you. It is a remote server at https://mcp.portant.co/mcp, listed in the Claude connector directory and the official MCP Registry, and it works in Claude, Claude Code, Cursor and any client that speaks MCP over HTTP. It is not in the ChatGPT app directory yet, but ChatGPT can add it as a custom app in developer mode where your plan includes it.

The document can be Markdown the assistant just wrote, a PDF, or a Google Doc shared with anyone who has the link. If the assistant drafts an NDA in the chat, Sign PDF typesets that draft into a PDF and adds a signature block, so no template has to exist first. It never signs for anyone: if you sign too, you get your link first, and the other person gets theirs only after you sign. With no sign-in at all (the /open/mcp address), Sign PDF emails the sender to review and confirm before anything reaches the signer. Signed in, you can ask to see the finished document first and send it only when it looks right.

Key features

• Eleven tools: send, check status, find past requests, get the signed PDF, get an upload URL, cancel, remind the signer, and list, read, change or delete saved templates
• On Plus and Scale: up to five signers in a set order, reminders, saved templates to send again, a webhook when a document is signed, and signed copies stored until you delete them
• Markdown, PDF (up to 5 MB and 50 pages) or Google Doc input
• Signature, date and text fields, placed by the assistant or added automatically
• Emails and signing pages in eight languages
• A signing certificate page on every signed PDF, with each person's name, email, IP address and signing time
• The same tools as a REST API, with an OpenAPI file

Pros

• Of the hosted servers we checked, the only one that turns Markdown the assistant wrote into a signable PDF with no template
• Free for 30 requests a month with no credit card; Plus is $12 a month or $120 a year ($10 a month) for 300, Scale is $39 a month or $396 a year ($33 a month) for 1,500
• Send, cancel, remind and delete are marked as destructive in the tool metadata, so your client can ask you before they run

Cons

• One signer on Free; more signers, up to five in a set order, need Plus or Scale
• No bulk send, and reminders and saved templates are on paid plans only
• Signing links expire after 14 days, and on Free the stored signed copy is deleted after 14 days (Plus and Scale keep it until you delete it)
• Simple electronic signatures only, with no qualified signature option for EU documents that need one
• Not in the ChatGPT app directory yet

Setup steps for each assistant are on the Portant for AI agents page.

2. Docusign MCP server, best for teams already on Docusign

Hosted  ·  Docusign OAuth  ·  Free plan: No (test sandbox only)

Docusign's server runs at https://mcp.docusign.com/mcp, and Docusign announced it would be generally available to every AI agent on September 30, 2026. It has connectors for Claude, ChatGPT, Gemini Enterprise, Microsoft Copilot, Slack and Perplexity, plus setup guides for Claude Code, GitHub Copilot and Gemini CLI. Docusign also launched a separate app in ChatGPT and Codex on June 2, 2026.

The server signs you in with OAuth, and every tool call is limited to your own Docusign permissions. Admins can switch MCP access off. The eSignature tools need a paid Docusign production account; the agreement-management tools need a Docusign IAM subscription. A free developer account works against the demo address, but those envelopes are watermarked and not legally binding.

On our tests: the tools create and send envelopes from templates or uploaded documents, and Docusign's own developer guidance tells you to keep a human confirming tool calls, because agents are open to prompt injection. That is the right advice, and it is the reason Docusign is the safe choice when legal already trusts it.

Pros

• The brand your counterparties already trust, with Docusign's audit trail and compliance
• Connectors for Microsoft Copilot, Slack and Perplexity as well as Claude and ChatGPT
• Agreement search and analysis on IAM plans, not only sending

Cons

• No free way to send a legally binding envelope; you need a paid Docusign plan
• Annual plans count envelopes per user per year (100 on Standard and Business Pro), and an envelope counts when sent
• Setup is heavier for one person who only needs an occasional signature

For a closer look, read our guide to the Docusign MCP server and its alternatives.

3. PandaDoc MCP, best for proposals and quotes from templates

Hosted  ·  PandaDoc OAuth  ·  Free plan: 5 sends a month

PandaDoc announced its MCP server on September 16, 2025. It runs at https://mcp.pandadoc.com/v1/mcp (an EU server is also available), signs you in with OAuth, and is listed in the Claude connector directory and as an app in ChatGPT. PandaDoc's guide also covers Claude Code, Cursor, Codex, VS Code and more.

The tools cover templates, documents, sending, status and the audit trail. On our first test, PandaDoc's own skill files are clear: a document created from Markdown has no fields, so it cannot be signed, and a signable document needs a template. That suits teams with a template library and pricing tables, and it is the wrong fit for "sign this paragraph I just wrote."

Pros

• Rich templates, content library and pricing tables for proposals
• MCP access at no extra cost on all plans for now, and a free eSign plan
• A tool that returns the document's audit trail

Cons

• The free plan allows 5 sends a month, shared with sends from the app
• Per-seat pricing: Starter is $19 per seat a month billed annually, Business $49
• PandaDoc says the free MCP access is for a limited time, and usage limits may come later

More detail: PandaDoc MCP alternatives.

4. signNow MCP, best for signing order and ChatGPT users

Hosted  ·  signNow sign-in  ·  Free plan: No (7-day trial)

signNow launched its MCP server on March 18, 2026, at https://mcp-server.signnow.com/mcp. It is in the Claude connector directory, and on March 31, 2026 signNow announced a native e-signature app in ChatGPT. Access is included with existing paid plans and the free trial.

Its tools cover the whole sending job: templates, invites with an ordered list of recipients, reminders, cancel, signing links, embedded sending and a download link for the finished document. Uploads take PDF, Word and image files up to 40 MB.

Pros

• Signing order for several signers. Signbee has none, and Sign PDF allows five, only on its paid plans
• Low entry price: Business is $8 a month billed annually
• Works in both Claude and ChatGPT

Cons

• No free plan, only a trial
• Annual plans include 100 signature invites a year, with a fee for each extra invite

5. Dropbox Sign through the Dropbox MCP server, best for teams already on Dropbox

Hosted (beta)  ·  Dropbox OAuth  ·  Free plan: 3 requests a month

Dropbox Sign does not have a server of its own. Instead, the Dropbox remote MCP server at https://mcp.dropbox.com/mcp now includes Dropbox Sign tools: send a document for signature, search requests, check status, send reminders, cancel, and download completed agreements with their audit trails. Dropbox lists Claude, Claude Code, ChatGPT, Codex and Cursor as clients. The server is in beta.

The appeal is that your files and your signature requests sit behind one connector. If the contract is already in Dropbox, the assistant can find it and send it in one conversation.

Pros

• One connector for files and signatures
• A usable free plan: 3 signature requests a month, up to 3 signers each
• Essentials is $15 a month billed annually

Cons

• Beta, with additional terms
• We could not find which Dropbox plans the Sign tools need

6. DocuSeal, best for open source and self-hosting

Hosted or self-hosted  ·  DocuSeal sign-in or token  ·  Free plan: 10 request emails a month

DocuSeal is open source (AGPLv3, about 18,700 GitHub stars) and has a connector in the Claude directory. If you self-host it, version 2.3.7 and later expose an MCP endpoint on your own domain, protected by a token you create in settings. The tools search templates, create templates, send documents and search documents.

On our first test, DocuSeal sends from a template, and its send tool fails if the template has no fields. So the assistant needs a prepared template, or a step that creates one.

Pros

• Run the whole signing stack on your own servers
• Cheap at volume: API and embedded documents are $0.20 each on Pro
• A free cloud plan with 10 signature request emails a month

Cons

• Template first, so a freshly drafted document needs more steps
• Pro is $20 per user a month, and the API needs a Pro seat

7. BoldSign MCP, best for developers already on the BoldSign API

Hosted or local  ·  API key  ·  Free plan: 25 envelopes a month

BoldSign offers both an open-source local server (@boldsign/mcp) and a hosted server at https://mcp.boldsign.com/mcp, with EU, Canada and Australia variants. Both use your BoldSign API key. Its 14 tools send from templates, list documents, send reminders, revoke documents and look up contacts and teams.

Pros

• Regional servers for data residency
• A generous free plan of 25 envelopes a month, and paid plans from $5 per user a month
• A clear API price: $30 a month for 40 envelopes, then $0.75 each

Cons

• We found no listing in the Claude connector directory
• The tools send from templates; we found no tool that sends a new uploaded file

8. SignWell MCP, best for template sends from Claude Desktop

Local  ·  API key  ·  Free plan: 3 documents a month

SignWell's server runs locally (npx @signwell/mcp setup, Node 18 or later) with an API key from your SignWell settings, and there is a Claude Desktop extension that stores the key in your keychain. SignWell names Claude Desktop, Claude Code and Cursor as clients. It sends documents, including from saved templates, tracks status and downloads the finished PDF.

On our second test, SignWell scores well: documents its tools create are drafts by default, so nothing goes out until you send it.

Pros

• Drafts by default, a sensible guard against an accidental send
• Low prices: Light is $10 a month billed annually for unlimited documents
• Pay-as-you-go API from $0.85 a document

Cons

• Local only, so it does not work in claude.ai or ChatGPT on the web
• The free plan allows 3 documents a month

9. Signbee, best for a first send with no account

Local  ·  None for the first send  ·  Free plan: 5 documents a month

Signbee is an e-signature API built for agents. Its MCP server is an npm package (npx -y signbee-mcp) with two tools, one for Markdown and one for a PDF URL. An API key is optional: without one, Signbee emails the sender a code to confirm, which is a good answer to our second test. Signbee is the closest rival to Sign PDF in shape, and it publishes a lot of useful material on agent signing.

Pros

• Markdown in, signed PDF out, with no account for the first send
• Free for 5 documents a month

Cons

• Local only, so no claude.ai or ChatGPT on the web
• Two parties only, with no signing order
• On October 16, 2026 we found it in neither the Claude connector directory nor the official MCP Registry, and its own pages show two different paid pricing models

More detail: Signbee alternatives.

What about Adobe Acrobat Sign?

We found no official MCP server for Adobe Acrobat Sign. Adobe's Acrobat app in ChatGPT and its Claude connector work on PDFs (edit, convert, combine, redact), and we saw no e-signature sending in either. If your company runs on Acrobat Sign, a bridge such as Zapier MCP can send agreements for signature and fetch the signed PDF. Zapier counts each successful tool call as two tasks, and its free plan has 100 tasks a month.

What we learned running an e-signature MCP server

Three lessons came from real failures, not from the spec.

Do not return the PDF in the tool result. In our tests, claude.ai limited a tool result to about 150,000 characters and Claude Code to about 25,000 tokens. A base64 PDF blows through both, so Sign PDF returns a private download link and emails the PDF instead.

Lead with the link, not the command. When Claude runs code inside a chat, its sandbox could not reach our server. Claude ran our download command first, it failed twice, and the user saw a failure for a request that had worked. We changed the reply to put the link first and tell the assistant to give it to the user.

Mark the dangerous tools. The ChatGPT directory blocks a tool that does not declare its read-only, destructive and open-world hints. Declaring them honestly is also what lets Claude ask you before a send goes out.

How to choose

• If your assistant writes the document (an NDA, a short agreement, a statement of work), pick Sign PDF by Portant or Signbee. Pick Sign PDF if you also work in claude.ai or ChatGPT on the web.
• If your company already runs an e-signature platform, use that vendor's server: Docusign, PandaDoc, signNow, Dropbox Sign or BoldSign. Your audit trail, templates and admin controls come with it.
• If you need several signers in order, Sign PDF Plus and Scale take up to five; for larger groups, pick signNow or Docusign.
• If data must stay on your servers, self-host DocuSeal.

Frequently asked questions

What is an e-signature MCP server?

An e-signature MCP server is a connector that gives an AI assistant tools to send documents for signature, check their status and get the signed copy. MCP (Model Context Protocol) is the open standard that Claude, ChatGPT, Cursor and many other assistants use to call outside tools.

Can an AI assistant sign a document for me?

It should not, and the servers in this guide are built to send documents, not to sign them. Sign PDF has no signing tool at all: every signature comes from a person in a browser. Docusign also tells developers to keep a human confirming tool calls.

Is a document signed from ChatGPT or Claude legally binding?

The assistant only sends the document; a person signs it, the same as any e-signature. Under the ESIGN Act and UETA in the US and eIDAS in the EU, a signature cannot be refused legal effect only because it is electronic. Some documents, such as wills or certain court and family law documents, still need a handwritten or qualified signature.

Is there a free e-signature MCP server?

Yes. Sign PDF by Portant is free for 30 requests a month with no credit card, Signbee is free for 5 documents a month, and PandaDoc's free eSign plan allows 5 sends a month. Docusign's free developer account only sends watermarked test envelopes that are not legally binding.

Which e-signature MCP servers work in ChatGPT?

Docusign and PandaDoc have apps in ChatGPT, signNow announced one in March 2026, and the Dropbox MCP server lists ChatGPT as a client. Any hosted server, including Sign PDF, can also be added as a custom app in ChatGPT developer mode where your plan allows it. Local servers such as SignWell and Signbee do not work in ChatGPT on the web.

Can I use an e-signature MCP server on Claude's Free plan?

Yes, with a limit. Claude's Free plan allows one custom connector, so you can add one e-signature server by its URL. On a Team or Enterprise plan, an owner adds the connector for the organization first.