E-signature the way it should work: upload a contract, let real AI read it and place the fields on the document's actual signature lines, send secure links your counterparties can sign without an account — and get back a tamper-evident signed PDF.
The full document lifecycle: upload a PDF, run AI detection, invite signers one after another or all at once, and finish with a stamped, tamper-evident, certified document — the whole loop tested end to end in the running product.
Outside parties open a unique signing link — no account, no login wall, no app to install. The link itself is the key, and it works for exactly one signer on exactly one document.
Signature, date, text, and dropdown fields rendered on the real PDF; sequential signing order fires "your turn" notifications between parties.
Completion produces a real signed PDF with signatures embedded and dates burned in — plus a stored digital fingerprint, so any later change to the file is immediately detectable.
One pass by the platform's built-in AI reads the uploaded document and returns its type, a summary, the parties and their signing order, compliance flags — and suggested fields with real page positions. The work is split cleanly: the AI understands the words, precise measurement places the fields.
On a real mutual NDA: it identified the document type, spotted New York governing law, pulled both parties by name, and placed four fields on the actual signature lines with 97% confidence — in a 19-second live run. It even flagged a signature block that was missing its line.
Honest AI is a feature. An earlier iteration of this product shipped fake AI — fixed field positions dressed up as detection. It was ripped out and replaced with the platform's built-in AI reading each live document — one that reports failure rather than making things up — and every claim on this page was verified against the running system.
Senders and signers are different populations, so SynergySign runs a deliberate two-identity model instead of hiding everything behind one login wall.
Team members sign in with SynergyAuth — the same seamless sign-in as Drive, Boards, and Meet — landing straight in the dashboard.
Signing links stay open by design: an outside counterparty should never hit a corporate login page. The link admits them to exactly one signing session and nothing else.
Next.js + PrismaPostgreSQLBuilt-in AI document readingPDF display + stampingOne company loginnginx + TLSDocker Compose