How to Scan and Sign a Contract on Your Phone (No Printer)

This guide walks through the whole scan → sign → send flow on iPhone and Android in about ten minutes.

Two housekeeping habits first: always keep the unsigned original scan alongside the signed copy (name it clearly, e.g. contract-original.pdf and contract-signed.pdf), and for high-stakes agreements — property, employment, anything with serious money — it is worth checking that an electronic signature satisfies your local rules before you send.

Step 1: Scan the contract into a clean PDF

A signature on a crooked, shadowy photo looks unprofessional. Get a proper scan first:

1. iPhone: open the Files app, tap the ··· menu, choose Scan Documents, capture each page, and save as a PDF.
2. Android: open Google Drive, tap +, choose Scan, capture the pages, and save as a PDF.
3. Private option (either phone): scan in your browser instead — capture, cleanup, and multi-page PDF export all run on the device, nothing uploads. Keep that option for NDAs and anything confidential.

Check every page is straight and legible before you sign — a signed scan with a missing page means starting over.

Step 2: Sign it on the phone (three free routes)

Route A: iPhone Markup — no app needed

The signature tool is already on every iPhone:

1. Open the scanned PDF in the Files app.
2. Tap the Markup icon (pen tip) at the top.
3. Tap the + button, then Signature.
4. Draw your signature with your finger (or add a saved one from a previous document).
5. Drag it into place on the signature line, resize it, then tap Done.

The signature is now baked into the PDF. Repeat on each page that needs signing.

Route B: Android Markup or a free fill-and-sign app

Android's free options depend on your phone, but you are covered either way:

• Google Photos Markup: open the scanned pages in Photos, tap Edit, choose Markup, and draw your signature with the pen tool — best for signing individual page images.
• Adobe Acrobat Reader (free) Fill & Sign: open the PDF, tap Fill & Sign, create your signature once by drawing it, then tap to place it on any signature field or line. The free version covers signatures without a subscription.

If your contract arrived as a signing link from an e-sign platform rather than a paper document, skip the scanning entirely: opening the link and signing as the recipient is free on the major platforms — sign, submit, and save the emailed confirmation copy.

Route C: reuse a saved signature image

Sign white paper once with a dark pen, photograph it in good light, and crop it tight. Save that signature PNG on your phone — it drops into any future scan with Markup or Fill & Sign, and the clean crop keeps it looking sharp on every document.

Step 3: Send the signed contract

• Email it to yourself first as a sanity check — open the attachment and confirm every signature landed on the right line and every page is present.
• Send from the same thread: reply to the email or message the contract came from, attaching contract-signed.pdf. Context in the thread beats a cold new email.
• Keep copies: save the signed PDF in Drive/Files and in the thread you sent it through. Keep the unsigned original too — if the other side questions a page, you can prove what changed.
• For messaging apps: WhatsApp and similar apps compress document attachments less than photos, but sending the PDF as a document (not a photo) keeps full quality.

Making your signature look right

• Sign once, reuse everywhere: a saved signature image placed identically on each page looks far more professional than three slightly different finger-drawings.
• Zoom in before placing: on the signature line, pinch to zoom so the signature sits exactly on the line, not floating above it.
• Match the ink color: most signed documents use black or dark blue ink — keep your digital signature the same.
• Date it: add the date next to your signature in the same markup session, so the date and signature clearly belong to one signing event.
• Don't obscure text: if the signature box is small, shrink the signature rather than letting it cover the terms above it.

Is a signature on a phone-scanned contract legally valid?
In most jurisdictions electronic signatures carry the same weight as handwritten ones for everyday agreements like leases, NDAs, and service contracts — the key is a clear intent to sign, which a placed signature demonstrates. For property transfers, wills, and some regulated documents, local law may require specific formats; check your local rules for high-stakes paperwork.

How do I add my signature to a PDF on iPhone without an app?
Open the PDF in the Files app, tap the Markup (pen) icon, tap + → Signature, draw it once, and drag it onto the signature line. Everything is built in — no download, no account.

How do I sign a PDF on Android for free?
Open the PDF in the free Adobe Acrobat Reader app, tap Fill & Sign, create your signature by drawing it, and place it where needed. For quick jobs on single pages, the Markup pen in Google Photos' editor works too.

Can I sign the PDF directly in Scanner.cam?
Scanner.cam handles the scan part — clean capture, perspective correction, and multi-page PDF export, all on-device and private. Add your signature afterwards with your phone's built-in Markup or a free fill-and-sign app, then send the finished file.

What is the safest way to send back a signed contract?
Reply in the same email thread the contract came from, attach the PDF as a document (not a photo), and keep both the unsigned original and the signed copy saved on your own device — not just in the sent mail.

Related guides

• How to Scan Multi-Page PDFs Online Free
• How to Scan Documents With Your Phone Camera
• How to Scan Documents on iPhone Without Downloading an App
• How to Scan Documents on Android Without Downloading an App
• How to Scan Receipts for Expense Reports (Free, No App)
• Is It Safe to Scan Documents Online? Privacy Explained