Legally binding contracts, signed online
Enflow OS lets clients sign your proposals and contracts online with an e-signature that follows the U.S. ESIGN Act and UETA. The signer verifies their email with a code, and you get a signed PDF with a certificate showing who signed, when, and from where.
Free on every plan (Estimates & Invoices module).
How it works
- Add your terms. Write the agreement into the proposal, or attach saved terms you reuse, then send it.
- Client signs. They review, type or draw their signature, confirm their email with a 6-digit code and sign.
- Countersign and file. Countersign if you need to. The signed PDF with its audit certificate is saved to the record.
What's included
ESIGN/UETA consent
The signer agrees to sign electronically with clear consent wording before signing.
Email code check
A one-time code sent to the client's email confirms the right person is signing.
Audit certificate
Signer name, email, IP address, browser, time and a SHA-256 hash of the signed content.
Version protection
If you edit the document after sending, the client can't sign the old version by mistake.
Countersignature
Add your own signature after the client signs, for agreements that need both sides.
Decline with a reason
Clients can decline and tell you why, so you can follow up with a revised offer.
Examples by industry
Agencies & consultants
Service agreements and statements of work signed before any work starts.
Event & rental companies
Rental agreements with damage and cancellation terms, signed with the deposit.
Home services & trades
Work authorizations signed by the homeowner before the job begins.
FAQ
Is an Enflow OS e-signature legally binding?
Electronic signatures are generally valid in the U.S. under the ESIGN Act and UETA. Enflow OS records consent, verifies the signer's email and keeps an audit trail. For high-stakes contracts, check with your attorney.
Do I need a separate e-signature tool?
No. E-signature is built into proposals and estimates in Enflow OS, so you don't need a separate e-signature subscription for client agreements.
Can my team countersign?
Yes. A team member can countersign after the client, and both signatures appear on the signed PDF.
What proof do I get?
A signed PDF with a certificate page listing the signer, email, time, IP address, browser and a hash of exactly what was signed.