NDAs
Send a mutual or one-way NDA, in parallel to both sides or in a set order, and get back a sealed copy with the full signing record attached.
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↗ · For contracts, NDAs & agreements
Send the NDA, get it back signed, keep the proof.
NDAs, service agreements, statements of work, and contracts. Multi-party signing in order or in parallel, with a tamper-evident audit trail and a sealed PDF on every completed agreement.
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↗ · What you'll send
A signature isn't worth much if you can't prove who signed it and when. Every completed agreement on Sign Sail ships as a sealed PDF with the signer's IP, timestamp, consent, and a SHA-256 hash that breaks if the document is altered after the fact.
Service agreements & SOWs
Scope, terms, and signature in one document. Prefill the client's details before you send so they only have to sign.
Multi-party contracts
Up to ten recipients per envelope, signing sequentially or all at once, with per-recipient reminders and decline-with-reason. (Multi-party envelopes are on the Business plan.)
Consent & authorization forms
Photo releases, data-processing consent, anything that needs a yes on the record with a timestamp behind it.
↗ · Questions
Asked before you ask.
Can multiple parties sign in a set order?
Yes. Business-plan envelopes route up to 10 recipients sequentially (each unlocked when the previous finishes) or in parallel, with per-recipient reminders, decline-with-reason, and expiry. The completed agreement carries one envelope-level audit trail across every signature.
What proof do I have that a signed agreement wasn't altered?
Two layers. The submission payload is hashed with SHA-256 at signing time, and the completed PDF is cryptographically sealed (PAdES), so any PDF reader can verify the file hasn't changed since completion. An edit to either breaks the math visibly.
Can I upload my own contract instead of building a form?
Yes, document signing is on every plan including Free: upload the PDF, place signature and date fields (or type tags like {{sig:s1}} in the source and they place themselves), and send. Forms are there for when you want structured data collected alongside the signature.
↗ · Templates for this work
Get your next agreement signed.
Start free. Upload a contract or build one as a form, send it to every party, and keep the sealed copy with its audit trail.