DocSpring

About DocSpring

DocSpring is a document generation and PDF filling API. It lets teams start from an uploaded PDF form, a Word document, an HTML/CSS layout, or a template built in a built-in Page Designer, then send JSON data to an API endpoint to receive a finished document, such as a filled PDF form, a DOCX/PDF pair, a ticket, or an invoice. For PDF forms, automatic field detection identifies fields on both fillable and flat PDFs, assigns names and data types, and adds conditional logic, required fields, and totals, with a review step in an editor before publishing. Word templates support tags with conditions and loops for table rows, the Page Designer supports text, images, tables, charts, QR codes, and barcodes, and HTML templates use HTML, CSS, and Liquid with a live PDF preview.

The product also supports collecting data and signatures: sending signature requests to one or more signers, embedding the signing page or a web form in another app, and receiving webhooks when a document is signed. Each signed PDF includes an audit trail recording events such as when a document was opened and signed. SDKs are available in ten languages (TypeScript, JavaScript, Python, Ruby, PHP, Java, C#, Go, Elixir, Rust) plus cURL, and an MCP server lets AI agents (e.g., Claude, ChatGPT, Cursor, VS Code) set up templates, fill them, and send them for signature with chosen access permissions; agent skills can also be installed via npx.

DocSpring is aimed at developers and their AI agents building document workflows, and the page lists customers in lending, insurance, property, and healthcare. It states SOC 2 Type II and HIPAA compliance, and offers a free start with no credit card required.

Key features

• Fills PDF forms, Word documents, HTML templates and designed pages via one API
• AI-powered automatic field detection on uploaded PDF forms
• Collects signatures with audit trails and supports multi-signer workflows
• Embeddable signing page and web forms for collecting data in your own app
• Webhooks notify your app when a document is signed
• MCP server and agent skills for connecting AI agents like Claude, ChatGPT, Cursor or VS Code

Frequently asked questions