Sign documents with legal validity. Simple, fast, Portuguese.
The most complete way to sign digitally in Portugal, for individuals and businesses. Start free.
5 signature methods in one place. From simple signature to the Digital Mobile Key (Chave Móvel Digital, CMD), Portugal's government-issued digital ID.
Compliant with eIDAS and Portuguese law.
Built to be simple for individuals and powerful for businesses. Sign documents in minutes, with full legal validity.
Simpler than printing and scanning
Upload your document (PDF, Word or image), mark where it needs signing, and you are done. Send it to others to sign or sign it yourself. All online, with nothing to install. Works on any device. Get notified when they sign.
Built-in AI
AssinaJá's artificial intelligence serves one purpose above all others: that nobody signs without understanding what they are signing.
Explains the document before you sign
On the signing screen, the Explain this document button opens a panel that answers questions about the contract in front of you — what it obliges you to do, what is unusual in it, whether you can cancel. It is a reading of the document, not legal advice.
Connect ChatGPT and Claude
Through the official MCP server, the assistant you already use can prepare and send documents from the conversation. It works with the permissions you give it — which you can revoke at any time.
Describe it, and the areas appear
In the editor, write in words where each person signs and the assistant places the areas. It always shows the plan before applying it: the person sending still makes the decision.
Save time with reusable templates
Create templates for the documents you use most — contracts, non-disclosure agreements, proposals — set once where each person signs, and reuse them every time. Need to send the same document, personalised, to several people at once? You can do that too, in one click — ideal for onboarding new staff or sending contracts to several clients. It also connects to other management software, with the history always organised.
5 signature methods. One place.
Choose the right level of security: from simple signature (informal documents) to the Digital Mobile Key or Professional Attributes (binding contracts with the highest legal force). AssinaJá is the only platform that integrates CMD and Professional Attributes natively. Compliant with eIDAS and Portuguese law. Encrypted storage, complete audit logs, and data in Portugal (GDPR).
Your documents, in your storage
Keep signed documents directly in your company's storage instead of on our servers. You keep full control of your files. Available now with Microsoft Azure — Google Drive, Amazon S3 and other options coming soon.
Why AssinaJá?
Simpler than the government solution
The state's application is free but complex and limited. AssinaJá has an intuitive UX, dedicated support, accepts every format, and supports templates and mail merge. Simplicity without sacrificing legal validity.
The only one fully integrated with Portuguese systems
AssinaJá is the only platform that integrates the Digital Mobile Key and Professional Attributes natively. Combine them with an API, mail merge and secure storage. Made in Portugal, for Portugal.
100% compliant and secure
eIDAS Regulation, GDPR and Portuguese legislation. Encrypted storage in Portugal. Immutable audit logs. Multi-factor authentication. Your signatures carry full legal force.
Plans for everyone
From occasional personal use to large companies. Digital Mobile Key included in every plan — including Free. Professional Attributes from Growth upwards.
- Monthly
- YearlySave 20%
Free
To sign your own documents
€0/year
- *2 CMD (Digital Mobile Key) signatures
- *5 signatures with a Local Digital Certificate
- *5 signatures without a certificate
- *1 document send to third parties
- 1 user
- *250MB of storage
- Email notifications included
*One-off allowances. When they run out, buy a pack with no subscription — 6 sends to third parties for €4.99 + VAT or 15 for €9.99 + VAT, valid for 12 months, each with 1 simple signature — or individual CMD signatures.
Launch
For small businesses and professionals
€588/year
- 5 CMD (Digital Mobile Key) signatures
- 15 signatures with a Local Digital Certificate
- 25 signatures without a certificate
- 3 users
- 2GB of storage
- Document generation templates
- Email notifications included
Growth
For growing businesses
€1,188/year
- 10 CMD (Digital Mobile Key) signatures
- 50 signatures with a Local Digital Certificate
- Signature with Professional Attributes (SCAP)
- 60 signatures without a certificate
- 10 users
- 5GB of storage
- 25 SMS notifications
- Document generation templates
- BYOS — your own storage (Azure)
- Email notifications included
Enterprise
For large organisations
€2,388/year
- 20 CMD (Digital Mobile Key) signatures
- 125 signatures with a Local Digital Certificate
- Signature with Professional Attributes (SCAP)
- 250 signatures without a certificate
- 50 users
- 15GB of storage
- 50 SMS notifications
- Unlimited document generation templates
- Export global templates
- BYOS — your own storage (Azure)
- Email notifications included
Frequently Asked Questions
Have a question that is not answered here? Get in touch with us.
Yes! The Free plan includes:
- 2 CMD (Digital Mobile Key) signatures
- 5 Local Digital Certificate signatures
- 5 signatures without a certificate
- 1 document send to third parties
- 1 user
- 250MB of storage
- Email notifications
These are one-off allowances that do not renew. When they run out, buy a pack of sends (from €4.99 + VAT, 6 sends) or subscribe to a plan from €49/month + VAT.
Yes, fully.
We comply with the eIDAS Regulation (European Union) and Portuguese law.
Signatures made with the Digital Mobile Key (Chave Móvel Digital) are qualified electronic signatures: they have the legal effect of a handwritten signature (Article 25 of eIDAS), and the document counts as a private document with recognised authorship (Article 376 of the Portuguese Civil Code).
No. AssinaJá works 100% in the browser. You can use it on a computer, tablet or mobile phone.
The Digital Mobile Key (Chave Móvel Digital) is the Portuguese State's digital identification system.
It lets you sign documents with the highest legal validity using only your mobile phone.
It is included in every plan, including Free.
Professional Attributes let you sign documents in your certified professional capacity — for example:
- Lawyers
- Doctors
- Engineers
- Accountants
AssinaJá is the only platform that integrates Professional Attributes natively. Included in the Growth and Enterprise plans.
Yes! With templates and mail merge (Launch, Growth and Enterprise plans), you can send dozens or hundreds of personalised documents at the same time.
Common use cases:
- Staff onboarding
- Contracts in bulk
- Mass sending of proposals
Both! AssinaJá is for:
- Individuals — rental agreements, sales, declarations
- Businesses — commercial contracts, HR, suppliers
From occasional personal use to large organisations.
You can upgrade at any time.
If you are on Free and only need to send a few more documents, buy a pack of sends (from €4.99 + VAT, 6 sends); if you send regularly, switch to a paid plan.
You can also buy extra resources individually:
- CMD signatures
- SMS notifications
- Additional storage
No penalties or long contracts.
It does, in two places:
- On the signing screen, the Explain this document button answers questions about the contract in front of you — what it obliges you to do, what is unusual in it, whether you can cancel.
- In the editor, you describe in words where each person signs and the assistant places the signature areas, always showing you the plan before applying it.
The explanation is a reading of the document, not legal advice.
Yes. AssinaJá has an official MCP server, and the assistant you already use can prepare documents, tell you who still has to sign and bring you the signed PDF, without leaving the conversation.
Access is granted with a key, with the permissions you choose, and can be revoked at any time.
Step-by-step instructions are in the help centre, at help.assinaja.pt/en/.
No. The AI prepares and explains; signing and sending still require a person.
The editor's assistant always shows what it is going to do before it touches the document, and sending is always your step.
The first time you use it, you are asked to accept the feature's terms.
Contact us
We are happy to book a demo or answer any question about AssinaJá. Fill in the form and we reply on the next business day.
Rua das Hortas, 434
4415-650 Lever
Vila Nova de Gaia
Portugal