The three ways to sign on iPhone, and what each one costs you
You can sign documents on iPhone using the built-in Notes app, Apple's Markup tool, or a third-party app like Adobe Acrobat Reader or DocuSign. Each method trades off convenience against how much data you share and where your documents live.
The Notes app and Markup are free and keep your signature local — nothing leaves your phone unless you choose to send it. Third-party apps are often free to read but may store copies of your signed documents on their servers, which means the company can see what you signed and when. If you sign sensitive documents regularly, the choice between these matters.
Key Takeaways
- Apple's built-in tools (Notes and Markup) keep your signature on your device and send nothing to Apple's servers unless you use iCloud.
- Third-party apps like Adobe and DocuSign store copies of your signed documents on their servers, which means those companies can see the content.
- Signing with Notes or Markup takes three steps: open the document, add your signature, and export the file — no account required.
- If you sign documents through a company's own system (like your bank's app), that company already has the document and your signature goes nowhere new.
Signing with Notes or Markup: keeping it on your device
The fastest way to sign a document on iPhone is to use the Markup tool built into Notes. Open the Notes app, create a new note, tap the camera icon at the bottom, select "Scan Documents," and photograph or import the document you need to sign. Then tap the Markup button (the pen-in-a-circle icon) and choose "Signature" from the toolbar.
The first time you use Signature, iPhone asks you to draw your signature on the screen with your finger. It saves that signature to your device. After that, every time you tap Signature, it inserts the same saved signature into the document. You can resize it, move it around, and add it as many times as you need.
Once you have signed the document, take a screenshot or use the "Share" button to export it as a PDF. The document stays on your iPhone until you send it — nothing is uploaded to Apple's servers unless you have iCloud backup turned on for Notes. If you turn off iCloud for Notes, your signed documents remain only on your device.
Using the Files app to sign PDFs directly
If you already have a PDF file on your iPhone, you can sign it without opening Notes. Open the Files app, find the PDF, tap it to open it, then tap the Markup button (the pen-in-a-circle icon in the top right). Select "Signature" and add your signature the same way as in Notes.
This method is simpler if the document is already a PDF file rather than a paper document you need to photograph. The signed PDF stays in your Files app until you move or delete it. Again, nothing leaves your device unless you send the file to someone else or have iCloud backup enabled.
Third-party apps: convenience with a privacy trade-off
Apps like Adobe Acrobat Reader, DocuSign, and HelloSign offer more features than Markup — they can send documents for signature, track whether someone has signed, and remind you if a signature is missing. But they do this by storing your documents and signature data on their servers.
When you sign a document in Adobe Acrobat Reader, Adobe keeps a copy of the signed file on Adobe's servers. When you use DocuSign, DocuSign stores the document and a record of your signature. Both companies can see what you signed, when you signed it, and sometimes who you sent it to. This is how they offer features like signature tracking and audit trails — they need to hold the data to provide those services.
These apps are useful if you sign documents as part of your job or if you need to send documents to others for their signatures. But if you are signing a one-off personal document, the built-in tools avoid sending your data anywhere.
When you sign through a company's own app
Many banks, insurance companies, and government agencies have their own apps where you can sign documents directly. When you sign through your bank's app, for example, the bank already has the document and your signature — it does not go to a third-party signing service.
These apps are usually the safest choice because the company you are dealing with is the only one who sees the signature. You are not introducing a new company into the process. Check whether the company offers signing in its app before you read a separate signing tool.
How to save and send your signed document
Once you have signed a document using Notes or Markup, you need to get it off your phone. Open the note or PDF, tap the three-dot menu or Share button, and select "Save as PDF" or "Share." You can then email it, text it, or save it to cloud storage.
If you use iCloud Drive, Google Drive, OneDrive, or Dropbox, be aware that uploading your signed document to these services means that company can see the file. iCloud Drive is encrypted end-to-end if you have iCloud+ (the paid tier), which means Apple cannot see the contents. Google Drive, OneDrive, and Dropbox can see your files unless you use their paid encryption features. If the document is sensitive, consider whether you need to upload it at all, or whether you can email it directly instead.
Comparing the methods: what you give up for each choice
| Method | Cost | Where your signature lives | Who can see it | Best for |
|---|---|---|---|---|
| Notes or Markup | Free | Your iPhone only (unless you use iCloud) | Only you, unless you send it | One-off personal documents |
| Adobe Acrobat Reader | Free to read; premium features cost money | Your iPhone and Adobe's servers | You and Adobe | Documents you need to track or send to others |
| DocuSign | Free to read; sending documents for signature costs money | Your iPhone and DocuSign's servers | You and DocuSign | Formal documents that need audit trails |
| Your bank or company's app | Free | Your iPhone and the company's servers | Only that company | Signing documents from that specific company |
Frequently Asked Questions
Is a signature made on iPhone legally valid?
Yes, in most places. The U.S. federal ESIGN Act and most state laws recognize electronic signatures as legally binding, including signatures made on a phone. However, some documents — like wills, powers of attorney, and real estate deeds — may have specific requirements about how they must be signed. Check with the person or organization asking for the signature if you are unsure whether a digital signature will work.
Can I use the same signature for every document?
Yes. When you create a signature in Notes or Markup, iPhone saves it and offers it every time you open the Signature tool. You can add the same signature to as many documents as you need. You can also create multiple different signatures if you want — just draw a new one the next time you use the Signature tool and iPhone will ask if you want to save it.
What happens to my signature if I delete the Notes app?
Your saved signature is stored separately from the Notes app itself, so deleting Notes will not erase your signature. If you reinstall Notes, your signature will still be there. If you want to delete your saved signature, go to Settings, then Notes, then scroll down and look for signature options.
Can someone forge my signature if I use the same one every time?
A digital signature is easier to copy than a handwritten one — if someone has a photo of your signature, they can paste it into a document. For this reason, do not use digital signatures for high-stakes documents like loans or legal agreements unless you are signing through an official channel (like your bank's app or a notary service). For everyday documents, a consistent digital signature is fine.
Is it safe to sign documents in a third-party app on public WiFi?
Third-party apps like DocuSign and Adobe use encryption to protect documents in transit, so signing on public WiFi is generally safe from someone on the same network seeing your signature. However, the app itself will still send your document to the company's servers. If you are concerned about the document content, wait until you are on a network you trust, or use your phone's cellular data instead.