How to Sign a PDF on Your Phone
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Printing a PDF just to sign it and scan it back is an anachronism. Most jurisdictions accept electronic signatures for ordinary business contracts, NDAs, quotes, and acknowledgments. Your phone is more than capable of producing a clean, legally usable signature in under a minute.
This guide covers signing a PDF on iPhone or Android using the PDF Editor app. The signature you save is reusable for every future document — you draw it once. After that, signing any contract is a four-tap operation: open, tap Sign, place, export.
We'll also cover the cases where signing on a phone is *better* than at a desk: contracts that need to go back fast, signing while travelling, and multi-signer flows that bounce between phones. By the end you'll have a saved signature ready for every future document.
Step by step
- 1
Open the PDF
Import the document into the PDF Editor app via Files, your cloud drive, email, or any sharing app. The signature workflow works regardless of where the PDF came from.
- 2
Tap the Sign tool
Found in the editing toolbar. Pick handwritten signature, typed signature, or initials. The tool detects existing signature fields automatically if the PDF was designed for signing.
- 3
Draw or type your signature
First time only. Use your finger, an Apple Pencil, or an S Pen. The result is saved to your device. You can edit or replace it any time from Settings.
- 4
Place the signature
Drag it to the right spot on the page. Resize with the corner handles. The signature becomes a regular PDF object, so you can move it after placement.
- 5
Add date and initials if needed
Many contracts ask for date next to signature and initials on each page. One-tap date stamps and a saved initials variant cover both cases.
- 6
Export the signed copy
Save as a new file (recommended — keep the unsigned original) or overwrite. The exported PDF includes signature metadata for record-keeping. Share via email, AirDrop, Drive, or any messaging app.
Tips
- Use a stylus instead of a finger when the document is going through visual review. The cleaner stroke makes a real difference for client-facing contracts.
- Save your signature once and reuse it on every future document — the app stores it locally on your device, never uploaded.
- Use a typed signature for routine internal acknowledgments and a handwritten one for external contracts.
- Apply a password to particularly sensitive signed documents before sharing — the Protect tool runs after signing.
- Keep the unsigned original PDF in a folder alongside the signed version. If a counterparty asks for a 'clean' copy or you need to re-sign with corrections, you'll have it.
Try it on your phone
Signing on a phone means contracts get back to the other side within the hour — sometimes within minutes. That speed advantage matters disproportionately when you're working away from a desk: at a customer site, between meetings, or in transit. The whole flow from receiving a contract to sending it back signed fits easily into a coffee break.
