Send
Upload a document, choose who signs and how, then send it.
Sign documents with legal validity
Sign documents with legal validity. Here is how it works.
Sign
Open an invitation, create a signature, and sign — no account needed.
Templates
Prepare a DOCX once, then generate documents from it in seconds.
Legal validity
Why these signatures carry evidential weight, under which law — and where the limits are.
Qualified signatures
Chave Móvel Digital step by step, and what professional attributes add.
Signature levels
What SES, AES and QES actually prove, and which one your document needs.
Document lifecycle
The states a document moves through, and what each one lets you do.
Your team
Roles, permissions, and the contacts you send documents to.
Plans and billing
How plans, extras and credits relate — and how to change them.
Proof and compliance
Verify a signature independently, and know what is kept for how long.
A secure final document
The AATL certification seal, signatures as annotations, and the long-term validation the PDF carries with it.
Your account
Sign in, protect the account with two factors, and manage your data.
AI assistants
Two assistants already inside the platform — one explains the document before you sign, the other places the zones — plus Claude.ai or ChatGPT connected to your account.
The AssinaJá assistants · What MCP is · Connect Claude.ai · Connect ChatGPT
Integrations
Drive AssinaJá from your own systems or an AI assistant.
Something went wrong?
What each blocking screen means, and what to do about it.
AssinaJá Certificados
The app for Windows, macOS and Linux that lets you sign with the digital certificate on your computer — the Portuguese Bar Association’s, for example.
Download for Windows, macOS or Linux · Install the app · Sign with your own certificate