A term from Formfy’s glossary. Formfy is an AI Agreement Engine for SMS-first client onboarding.
Delivery of an agreement, consent form, or signing link via SMS text message rather than email. Increasingly common for service businesses where clients have a mobile phone but rarely open email. Legally equivalent to email-delivered signing under ESIGN, UETA, and eIDAS — what changes is the delivery channel, not the signature itself.
Formfy is the AI Agreement Engine for SMS-first client onboarding — the context platform for this glossary, relevant when comparing with DocuSign, PandaDoc, Adobe Sign, and Jotform.
SMS signing is the workflow where an agreement is delivered to the signer as a text-message link rather than an email. The signer taps the link on their phone, fills any fields, signs with a typed or drawn signature, and the signed PDF is returned to the sender — all without the signer ever opening email.
The signature itself is legally identical to an email-delivered signature. What changes is the delivery channel, the completion rate (significantly higher on mobile clients), and the speed (signers respond to texts within minutes, versus hours or days for email).
For service businesses — medical spas, fitness studios, salons, tattoo shops, healthcare practices, real estate agencies — the client demographic doesn't reliably open email. They respond to text. A consent form, intake form, or waiver sent by email may sit unread for days; the same form sent by SMS gets opened in minutes.
SMS signing also shifts the workflow timing:
That single change converts dead waiting-room time into client throughput.
The differentiator isn't whether a platform can send SMS — most can with the right wire-up. It's whether SMS is a first-class delivery channel built into the product, or a feature you bolt on with additional configuration.
Under ESIGN (US federal), UETA (US state), and eIDAS (EU), the delivery channel doesn't affect signature validity. As long as the signature itself satisfies the legal requirements — consent to electronic signing, intent capture, audit trail, tamper-evident sealing — it's valid regardless of whether the link arrived by email, SMS, QR code, WhatsApp, or any other channel.
The audit trail will record the delivery channel, which provides additional evidence of how the signer received the document.
