Open Source Document Signing API Integration
Embed legally binding signatures into your app without DocuSign's bills. DocuSeal's REST API runs on your infrastructure. No per-signature fees. No data lock-in.
Why Choose DocuSeal for API Signing?
Compared to SaaS alternatives, you get full control, transparent pricing, and the ability to customize every part of your signing workflow.
Flat monthly cost, no per-signature fees
DocuSign charges $0.50-$2.50 per signature. PandaDoc adds up based on templates and users. DocuSeal on Opsily is one price: handle 100 signatures or 100,000 in the same month, same cost. Your bills stop growing when your usage does.
GDPR compliant by default
EU customers can't use most US-based signing platforms without legal risk. DocuSeal data never leaves your chosen region. Self-host in Germany, Ireland, or anywhere else. No data residency compromises.
Full API control, no vendor lock-in
Your signatures, templates, and workflow data live in an open database. Export anytime. Modify the code. Build custom integrations DocuSign's closed API will never support. You own the entire stack.
Built for teams who need reliability
Trusted by fast-moving teams
The DocuSeal API in 4 Steps
Integrate document signing into your app in under an hour.
1. Create Your Template
Design once, reuse forever. Upload a PDF, mark where signatures go, set field names. The template builder runs in your browser. No template limits.
2. Call the API
Send the template plus signer emails. One POST request kicks off a signing workflow. DocuSeal emails each signer a link. You get webhooks for every status change: sent, viewed, signed, completed.
3. Signers Click and Sign
Signers open the email link in any browser. They draw a signature, type one, or upload an image. They see what they are signing. Multi-party workflows run in order (sequential) or all at once (parallel).
4. Retrieve the Signed Document
After all parties sign, your webhook fires. Pull the completed PDF via API. It includes an audit trail proving who signed, when, and from where. Legally binding in all 50 US states and EU member countries.
EUR 800 a year for tools that used to cost us multiples of that. We replaced HubSpot, Make.com, and our password manager with self-hosted apps on Opsily. One provider, one fee.
Franz Koller
Co-Founder · Joy
DocuSeal vs. DocuSign
Same outcome. Different business model.
DocuSign pricing as of May 2026. Opsily pricing shown for Small plan ($20/mo). Exact savings depend on signature volume and contract terms.
Pair DocuSeal with Your Stack
Common integration patterns: automate workflows with n8n, store signed PDFs in Supabase, embed signing into Directus content.
Simple, Transparent Pricing
All plans include GDPR-compliant EU hosting and the full DocuSeal API. No credit card needed to start free.
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Trusted for Compliance
DocuSeal meets the strictest standards for data protection, security, and legal validity.
GDPR Compliant
Data stays in the EU. GDPR Data Processing Agreement available. No data transfers to the US.
Legally Binding Signatures
eIDAS (EU), UETA (US), and esignature laws in 50+ countries. Audit trail included. Court-admissible evidence.
Open Source
Full source code on GitHub. Reviewed by thousands of developers. No backdoors, no surprise changes.
Bank-Grade Encryption
End-to-end encryption for signed documents. TLS 1.3 for all API calls. Regular security audits.
99.9% Uptime SLA
Hosted on EU cloud infrastructure. Daily encrypted backups. Automatic failover to redundant servers.
Questions About DocuSeal's API
Everything you need to know about integrating open source document signing.
Most developers integrate in under an hour. You sign up, create a template in the web builder (5 minutes), then make your first API call. DocuSeal's SDK handles the REST details: generating signing links, managing status webhooks, retrieving signed PDFs. If you are familiar with any REST API, DocuSeal feels straightforward. The hardest part is usually getting the exact PDF field positions right in the template builder, not the code.
What our customers say
Teams across the EU run their stack on Opsily. Here is what that looks like in practice.
EUR 800 a year for tools that used to cost us multiples of that. We replaced HubSpot, Make.com, and our password manager with self-hosted apps on Opsily. One provider, one fee.
Franz Koller
Co-Founder • Joy
We were paying per user on everything and it added up fast. Now we run five apps for less than one of those old plans. My finance team finally stopped asking questions.
Elise
Head of Operations
Wanted to use n8n for ages but the self-host part always stopped me. Opsily just handled it. Got the power without becoming an IT person overnight.
Federica B.
Automation Consultant
Stop Paying Per Signature
Deploy DocuSeal in minutes. No credit card. No setup fees. Full API access from day one.