What Is a Countersigned NDA?

What “countersign” means

To countersign is to add your signature to a document someone else has already signed. In a two-party NDA, the first signature usually comes from whoever prepared or sent the agreement, and the countersignature comes from the other party. Once both signatures are on the same text, the NDA is fully signed, sometimes called fully executed.

People also say “the countersigned copy” to mean the version with every signature on it. That’s the copy each party should keep. An NDA with one signature is an offer waiting for an answer; the countersigned one is the agreement.

The word has another use. In banking and some companies, a countersignature is a second signature that confirms or approves the first, like a second officer signing a large check. For an NDA, it simply means the other party’s signature.

Who signs first, and does the order matter?

No law says who has to sign an NDA first. Often the party sending it signs first, which shows it stands behind the terms and lets the other side sign and be done. Some companies prefer to sign last, so that someone with authority reviews the final version after the other side has signed.

The order rarely matters legally, but the dates can. Many NDAs, including FastNDA’s, take effect on the date the last party signs. Under those, the countersignature date is the Effective Date, and the agreement’s term is measured from it.

Is an NDA binding before it’s countersigned?

Don’t count on it. If the NDA says it takes effect when the last party signs, as FastNDA’s does, there’s no agreement until the countersignature is on it. Even when a document doesn’t say that, whether a contract signed by only one side binds the other depends on the wording and the facts, such as whether the other side clearly accepted it some other way. That’s an argument to have later, not a plan.

The practical rule is simple: wait for the countersigned copy before you share anything sensitive. If someone suggests you start talking while the paperwork catches up, keep the conversation general until it does.

When the other side changes something

A countersignature only means something if it’s on the same words the first party signed. If the other side edits the NDA before signing, by crossing out a clause, changing the term or adding a paragraph, they haven’t accepted your agreement. Under general contract principles, a reply that changes the terms usually works as a counteroffer, which you’re free to accept or reject.

So don’t treat a marked-up PDF as countersigned. Read the changes, and if you agree with them, both sign the new version. Handwritten edits initialed by only one side are a common source of later arguments about what was actually agreed.

What to keep

Each party should end up with an identical copy of the countersigned NDA. Before you file it away, check that it has:

• Both signatures, with each signer’s name and, for a company, the company’s name and the signer’s title.
• The date of each signature, so the Effective Date is clear.
• The complete agreement: no missing pages and no blanks left unfilled.
• For an electronic signature, a record of how and when each person signed.

How countersigning works on FastNDA

On FastNDA, the person creating the NDA signs first. You fill in the details, read the agreement, type your name to sign and pay $29. At that moment the text is frozen and a SHA-256 fingerprint of it is recorded. The other party gets a private link by email, reads the same agreement and countersigns with their typed name, free and with no account. Their signature is checked against the fingerprint, so they can only sign the exact words you signed.

When they countersign, the agreement takes effect and you both get the countersigned PDF by email. It ends with a certificate of completion showing when each of you signed, from which IP address and device, and when they first opened it. If they want a change, they can’t edit your text: they decline with a note, and you can edit and resend at no extra charge, so you both sign the new version. You can read the full wording first in the mutual NDA template.