--- title: "Sign: Free E-Signature for Contracts | Ambiguous" description: "Send contracts for signature from any PDF or Doc. ESIGN/UETA-compliant PKI seal. Signers sign without an account." canonical: "https://www.ambiguous.ai/applications/sign" --- MCP-ready # Sign **Ambiguous Sign**. E-signature your AI coworkers can prepare and your team signs. ESIGN/UETA-compliant PKI seal on every contract. Open Sign[Add to your agent](https://www.ambiguous.ai/agents/mcp) Free foreverNo credit card Send contracts for signature starting from any PDF or Ambiguous Doc. Recipients sign with a link, no account required. Every signature carries an ESIGN/UETA-compliant PKI seal and a Certificate of Completion stored in your Drive. ## Features Upload a PDF or start from an Ambiguous Doc. Mark signature fields (signature, date, initials) and drag them into position. Send for signing via capability link. Signers never need an account. Track status in real time. Send for signatureSelect a document, mark signer fields, and send. Recipients sign with a link, no account needed.Start from any formatUpload a PDF or start from an Ambiguous Doc. Mark signature, date, and initial fields visually.Legally bindingESIGN and UETA compliant with PKI seal and Certificate of Completion. Audit trail on every signature. ### Status tracking See who has signed and who hasn't. Get notified on each signature event. Resend reminders with one click. 10k Sign Ask assistant12RRyan Consulting Agreement: Kova CorpSaved Draft Send for signing Consulting Agreement: Kova Corp Prepared by Ambiguous AI · 3 pages · 2 signers This Independent Contractor Agreement (the "Agreement") is entered into as of the date last signed below, by and between Ambiguous AI, Inc. ("Company") and the undersigned contractor ("Contractor"). 1\. Services Contractor agrees to provide consulting services as described in Exhibit A attached hereto. Work shall be performed remotely unless otherwise agreed. Signatures Sarah Chen Mar 15, 2026 Consultant Signature (Company) Initials (Company) Ryan Signers S Sarah Chen Client R Ryan Waliany Consultant Document Fields Signature2 Date2 AaInitials1 Save as template ### Included from day one The rest of the Sign feature set. Every item ships in every workspace, for your team and your AI coworkers alike. Everything included * Field marking Drag signature, date, and initials fields onto any position in the document. Assign each field to a signer role. * Capability links Signers receive a unique link, no account required. Open, review, sign, done. Works on any device. * Certificate of Completion Every signed document includes a PKI-sealed certificate with timestamps, IP addresses, and signer identity verification. * Start from a Doc Draft in Ambiguous Docs, then send for signature without exporting. The signed artifact lands back in Drive. * Audit trail Every view, field fill, and signature event is logged. Export the full trail for compliance records. ## ESIGN/UETA-compliant with PKI seal. Every signed document meets ESIGN and UETA requirements for legally binding electronic signatures. No compliance gaps, no manual audit trail assembly. ### PKI seal Cryptographic signature on every completed document. Tamper-evident: any modification after signing invalidates the seal. ### Certificate of Completion Timestamps, IP addresses, and signer identity for every signature event. Exportable as a standalone compliance record. ### Full audit trail Every view, field fill, and signature event logged with millisecond precision. Export the trail for legal proceedings or compliance reviews. ## One product, two ways in Your agent prepares signature requests via MCP or REST: it assigns signers, marks fields programmatically, and receives a webhook when all parties sign. A person on your team confirms the send, and agents are never signers. The signed PDF with Certificate of Completion lands in Drive automatically. Your team's view 10k Sign Ask assistant12RRyan Consulting AgreementSaved Draft Send for signing Consulting Agreement Prepared by Ambiguous AI · 3 pages · 2 signers This Independent Contractor Agreement (the "Agreement") is entered into as of the date last signed below, by and between Ambiguous AI, Inc. ("Company") and the undersigned contractor ("Contractor"). 1\. Services Contractor agrees to provide consulting services as described in Exhibit A attached hereto. Work shall be performed remotely unless otherwise agreed. Signatures Client Signature (Sarah Chen) Date (Sarah Chen) Initials (Sarah Chen) Signers S Sarah Chen Client R Ryan Waliany Sender Document Fields Signature2 Date2 AaInitials1 Save as template Your agent's view mcp-sign-create.ts Copy ``` // Create a signature request via MCP const result = await mcp.callTool("sign.requests.create", { document_id: "doc_abc123", signers: [ { email: "client@example.com", role: "signer" } ], message: "Please sign the NDA." }); ``` ## What your agent can do in Sign Every action your team takes in Sign, your agent can do the same way. | Method | Description | | --- | --- | | create_sign_document | Create a signature request with signers and fields | | get_sign_document | Check signing status and signer progress | | sign_add_field | Add signature or initial fields to the document | | sign_confirm_send | Send the request to signers via secure link | | sign_get_certificate | Download the signed PDF with certificate | [See tools for all apps →](https://www.ambiguous.ai/assistant#tool-catalog) ## Imports and exports Start from any PDF. No signer account required. Send from an Ambiguous Doc or upload a .pdf. Signers click a capability-link and sign without login. ESIGN/UETA-compliant PKI seal and Certificate of Completion on every signed document. Trigger signature requests programmatically via MCP or REST. .pdf Ambiguous Doc .pdf (signed) Certificate ## Get started For your teamFor your agents Get started with a free workspace. All 18 apps included, no credit card required. [Create a workspace](https://app.ambiguous.ai/register) ## The Full Workspace [Ambiguous Automations Trigger, filter, and action workflows connecting webhooks, events, and the Assistant. ](https://www.ambiguous.ai/applications/automations) [Ambiguous Docs Collaborative document editing for humans and AI coworkers. ](https://www.ambiguous.ai/applications/docs) [Ambiguous Sheets Organize and analyze tabular data. Your team writes formulas; your coworkers read ranges and patch cells. ](https://www.ambiguous.ai/applications/sheets) [Ambiguous Docs Collaborative document editing for humans and AI coworkers. ](https://www.ambiguous.ai/applications/docs) [View all applications →](https://www.ambiguous.ai/applications)