How to e-sign a contract on iPhone — 3 free methods

When iPhone signing is enough — by contract type

The short version: ordinary business contracts (NDAs, freelance, employment offers, most service agreements) are fine for iPhone signing. Real estate, notarised documents, and wills are not — they require either a specialised audit trail or physical signing with witnesses.

Step by step — the three free methods

Method 1 — iOS Markup (Mail or Files)

1. Open the contract PDF in Mail (long-press the attachment → "Markup") or in the Files app (tap the file → top-right pencil icon).
2. Tap the "+" button in the Markup toolbar, then choose "Signature". Draw your signature with a finger or Apple Pencil and tap "Done". iOS saves the signature for reuse across all future Markup sessions.
3. Drag the signature into position on the signature line. Resize using the corner handles. Tap "Done" in the top-left, then "Save" or "Reply with attachment" depending on the host app.

Method 2 — ScoutMyTool Sign PDF in Safari

1. Open Safari, go to scoutmytool.com/pdf/sign-pdf and tap "Choose PDF". Pick the contract from Files, iCloud Drive, Google Drive (via the Files provider), or Photos.
2. Draw or upload your signature in the signature panel. The tool processes the file entirely in the browser tab — the contract is not uploaded to any server.
3. Tap the signature stamp, drag onto the signature line, and tap "Download signed PDF". The file is saved to your Files app and can be emailed or AirDropped to the counterparty.

Method 3 — Apple Books signature flow

1. Open the contract PDF in Apple Books (Share menu → "Books" from any PDF). Scroll through to review the contract terms before signing.
2. Tap the Markup icon (top right). Use the same "+" → "Signature" flow as Method 1. Apple Books shares signature storage with Mail and Files, so a signature saved in Markup elsewhere is already available here.
3. When done, tap the Share button and pick AirDrop, Mail, or Files. Books saves the signed copy back to the Books library; the original is unchanged.

Method comparison — legal validity and audit trail

Related reading

• How to e-sign a PDF on iPhone: the broader PDF-signing guide, with five methods instead of three.
• How to sign a PDF — desktop and mobile: the full cross-platform walkthrough.
• Digital vs electronic signature: the distinction between drawn signatures, cryptographic signatures, and qualified signatures.
• DocuSign alternatives: free and lower-cost e-signature platforms that include Certificates of Completion.
• Free NDA template: a customisable NDA to sign and send.
• Free rental-agreement template: state-aware lease template.
• ScoutMyTool Sign PDF: the in-browser signing tool.

FAQ

Is a contract I sign with my finger on an iPhone legally binding in the US?

Yes, for the vast majority of contracts. The Electronic Signatures in Global and National Commerce Act of 2000 (ESIGN, 15 U.S.C. § 7001) and the Uniform Electronic Transactions Act (UETA), adopted by 49 of 50 US states, both establish that a signature cannot be denied legal effect merely because it is electronic. A finger-drawn signature embedded in a PDF satisfies the four ESIGN requirements: intent to sign, consent to do business electronically, association with the record, and retention of the signed record. Exceptions are narrow — wills, certain trust agreements, some real-estate filings, and a handful of family-law documents — and your iPhone-signed NDA, freelance agreement, or offer letter is on solid legal footing.

What about the EU — does eIDAS recognise an iPhone signature?

Yes. The EU eIDAS Regulation (910/2014) defines three tiers: simple electronic signature (SES), advanced electronic signature (AES), and qualified electronic signature (QES). An iPhone-drawn signature qualifies as an SES and is admissible as evidence in court across all EU member states. For most B2B and consumer contracts, SES is the customary tier and an iPhone signature is enough. AES and QES are required only for specific regulated transactions (some financial filings, public procurement above EU thresholds, certain notarised acts).

My counterparty insists I use DocuSign. Why?

Usually for one of three reasons. First, audit trail: DocuSign issues a Certificate of Completion listing each signer's IP address, email-verification timestamp, and the document's SHA-256 hash — useful if the agreement is later disputed. Second, identity verification: DocuSign can require email verification, SMS code, or knowledge-based authentication before signing, which an iPhone signature does not. Third, brand expectation: in real estate, lending, and large enterprise procurement, a DocuSign-branded workflow is the customary baseline. For everyday B2B contracts (NDAs, freelance agreements, vendor SOWs), an iPhone signature is legally equivalent and faster — but a counterparty can still insist on DocuSign as a matter of preference.

How do I send the signed contract back without losing the signature?

Save the file as PDF (not JPG, not screenshot) and send by email, AirDrop, or any file-sharing channel. The iOS Markup signature is embedded as part of the PDF page content, so any PDF viewer on any platform will display it. Avoid taking a screenshot of the signed page and sending the image — that loses the underlying PDF structure, makes the contract harder to print and archive, and signals informality to the counterparty. If the file is sensitive, password-protect it with ScoutMyTool's Protect PDF tool before sending and share the password separately.

Can both parties sign on iPhone, or does one party need a real e-signature platform?

Both parties can sign on iPhone for any contract that does not require a Certificate of Completion. The mechanics: Party A signs in iOS Markup, emails the signed PDF to Party B, Party B opens the attachment in Markup, adds their signature, and emails it back. The final file shows both signatures on the same PDF. The email thread serves as informal audit trail (timestamps, sender identity via the email server). For contracts above ~$25,000 in value or where a future dispute is plausible, consider DocuSign or a similar platform to get the audit certificate — but for most contracts the email-plus-PDF flow is enough.

Is there a way to e-sign a contract on iPhone without uploading it anywhere?

Yes — two of the three methods in this article keep the file entirely on the device. iOS Markup processes everything locally, never uploads. ScoutMyTool's Sign PDF tool runs in the Safari tab using JavaScript and pdf-lib — the file never leaves the browser. Both are appropriate for sensitive contracts where you do not want the file to transit through a third-party server. DocuSign, Adobe Acrobat (cloud features), and most other platforms do upload the file during signing.

What if my contract has fillable form fields, not just a signature?

iOS Markup can fill text fields in PDFs that use AcroForm (the standard PDF form format) — tap the text field, type, then add your signature on the signature field. For more complex forms (calculated fields, date pickers, conditional fields) use Adobe Acrobat Reader on iOS, which understands more of the AcroForm spec. For non-AcroForm "flat" PDFs that look like forms but have no interactive fields, use ScoutMyTool's Sign PDF tool — it lets you place typed text and signature stamps anywhere on the page.

Citations

1. Electronic Signatures in Global and National Commerce Act, 15 U.S.C. § 7001 (2000) — the foundational US e-signature statute.
2. Uniform Electronic Transactions Act (UETA), Uniform Law Commission, 1999 — adopted in 49 of 50 US states.
3. EU Regulation 910/2014 (eIDAS) — electronic identification and trust services in the EU single market.
4. Apple iOS User Guide — "Mark up files in Mail on iPhone" — official documentation of the Markup signature flow.
5. National Association of Realtors guidance — "E-signatures and the real-estate transaction" — explains when a Certificate of Completion is expected.