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How to Sign a PDF on iPhone and iPad: A Complete 2026 Guide

Your iPhone and iPad are two of the best PDF signing tools you already own. The touchscreen lets you draw a signature that looks natural, and with Apple’s built-in Markup feature you can go from receiving a document to sending back a signed copy in under a minute, without downloading a single app. This guide […]

Your iPhone and iPad are two of the best PDF signing tools you already own. The touchscreen lets you draw a signature that looks natural, and with Apple’s built-in Markup feature you can go from receiving a document to sending back a signed copy in under a minute, without downloading a single app.

This guide covers every reliable way to sign a PDF on iPhone and iPad in 2026. You will learn how to use Markup inside the Files app, sign attachments straight from Mail, save a reusable signature, get the cleanest results with an Apple Pencil on iPad, and when a dedicated tool makes more sense. Each method is laid out step by step, so you can follow along while your document is open.

Why Sign PDFs on Your iPhone or iPad

Signing on your phone or tablet removes the whole print-sign-scan routine. Instead of finding a printer, signing by hand, and scanning the page back in, you draw your signature once on the screen and place it exactly where it belongs.

The benefits add up quickly:

  • Speed. A document can be signed and sent back in seconds.
  • Anywhere access. You can sign from a coffee shop, an airport, or your couch.
  • Reusable signatures. Markup saves your signature so you never have to redraw it.
  • Clean results. A drawn or typed signature looks far sharper than a faded scan.

A signature added with Markup is an electronic signature, which is widely accepted for school forms, internal approvals, rental paperwork, and most everyday agreements. For contracts and high-stakes documents where you need verification and an audit trail, a dedicated signing service adds stronger legal standing, and we cover that option below.

Method 1: Sign a PDF in the Files App With Markup

The Files app is the most flexible place to sign on iOS and iPadOS because almost any PDF can be saved there first. Markup is the built-in tool that handles the signing.

Here is how to do it:

  1. Open the Files app and tap the PDF you want to sign so it opens in the viewer.
  2. Tap the Markup icon, which looks like a pen tip in a circle.
  3. Tap the + (plus) button in the Markup toolbar.
  4. Choose Add Signature (called Signature on some versions).
  5. If this is your first time, draw your signature with your finger or an Apple Pencil, then tap Done.
  6. Tap the saved signature to drop it onto the page.
  7. Drag it onto the signature line and use the blue handles to resize it.
  8. Tap Done, then use the share button to save or send the signed PDF.

A quick tip for cleaner results: turn your iPhone to landscape mode before drawing, and sign slowly. The wider canvas gives your signature more room to look natural. On iPad, an Apple Pencil produces the cleanest strokes, especially in small signature boxes.

If you want a signature that looks consistent every time rather than a slightly different freehand version on each document, you can prepare one in advance. A free tool like the handwritten signature generator at eSignaturely lets you create a polished signature once, with no registration needed. You enter your initials on the form to generate a styled signature, or draw your own unique signature by hand, then save it as an image you can drop into any document.

Method 2: Sign a PDF Attachment Directly in Mail

When someone emails you a PDF to sign, you do not even need to leave the Mail app. Markup is built right into the email preview, so you can sign and reply in one flow.

Follow these steps:

  1. Open the email and tap the PDF attachment to preview it.
  2. Tap the Markup icon (the pen tip) in the top corner.
  3. Tap the + button, then choose Add Signature.
  4. Draw your signature, or tap one you have already saved.
  5. Position and resize the signature on the document, then tap Done.
  6. Mail offers to attach the signed copy to a reply, so you can send it straight back to the sender.

This is the fastest route for documents that arrive by email, which is most of them. There is no need to save the file elsewhere first, and the sender gets the signed version the moment you hit reply.

Method 3: Save and Reuse Your Signature in Markup

One of the best features of Markup is that it remembers your signature. Once you create one, it stays in the signature menu so you can reuse it on any document, on any Apple device signed into the same account.

To manage your saved signatures:

  1. Open any PDF in Files or Mail and tap the Markup icon.
  2. Tap +, then Add Signature.
  3. Tap the small arrow or Add or Remove Signature to see your saved options.
  4. Tap + to create a new one, or swipe to delete an old one.

Having a saved signature ready means future documents take seconds. You tap the signature, place it, and you are done. If you want a more refined version than a finger drawing, you can create one with a free online generator and save that image to your Photos, then insert it through Markup whenever a polished look matters.

Method 4: Sign on iPad With an Apple Pencil

The iPad with an Apple Pencil is the closest thing to signing on real paper. The pressure sensitivity and precision make your signature look genuinely handwritten, which is ideal for documents where appearance matters.

The steps mirror Markup on any device:

  1. Open the PDF in the Files app and tap Markup.
  2. Tap +, then Add Signature.
  3. Sign with the Apple Pencil, using slow, deliberate strokes.
  4. Tap Done, place the signature, and resize it.
  5. Save or share the finished file.

Because the Apple Pencil gives you fine control, you can also annotate the document, fill in fields, and add the date by hand in the same session. This makes the iPad a strong choice for filling and signing forms that have several blanks to complete.

Method 5: Use a Dedicated Tool for Forms and Legal Documents

Markup is perfect for quick signing, but it has limits. It does not add typed signature options, structured fields, timestamps, or an audit trail, and it does not handle sending a document to multiple signers. For business forms, legal agreements, and anything that needs verification, a dedicated signing tool fills the gap.

A browser-based signing tool is often the easiest option because it runs in Safari with no app to install. You upload the PDF, draw or type your signature, add any text or date fields, and download the signed copy. Many of these tools also let you fill in form fields cleanly, which is handy when a PDF has more than just a signature line.

If your document is a fillable form rather than a simple sign-here page, a fill and sign a PDF online tool lets you complete every field and add your signature in one place, directly from your iPhone or iPad browser. And when you just need a quick, no-fuss signature on a single PDF, you can sign a PDF online for free without installing anything at all.

For documents you want to keep on file, look for a tool that lets you save the signed version as a finished PDF. Being able to download a digital signature for your PDF means you keep a clean, shareable copy that preserves the layout exactly as you signed it.

Tips for a Clean Signature on iPhone and iPad

A few small habits make your mobile signatures look far more professional:

  • Use landscape mode on iPhone. The wider canvas gives your signature room to breathe.
  • Sign slowly. Rushing produces jagged lines; deliberate strokes look natural.
  • Prefer the Apple Pencil on iPad. It is the closest experience to signing on paper.
  • Resize carefully. Match the signature to the size of the signature line so it does not crowd the page.
  • Save a copy. Keep your original untouched and share a signed duplicate, so you always have a clean source file.

Which Method Should You Use?

For a PDF that lands in your inbox, signing straight from Mail (Method 2) is the quickest path. For files saved on your device, Markup in the Files app (Method 1) gives you the same tools with more flexibility. If you sign often, save your signature in Markup (Method 3) so every future document takes seconds. iPad owners with an Apple Pencil (Method 4) get the most natural-looking results. And for business forms, multi-field documents, or anything legally sensitive (Method 5), a dedicated browser tool gives you the structure and polish that Markup cannot.

The common thread is preparation. Create one clean signature, save it where you can reach it instantly, and signing a PDF on your iPhone or iPad becomes a quick, routine task.

Conclusion

Signing a PDF on your iPhone or iPad is genuinely simple once you know the tools. Apple’s built-in Markup feature lets you draw and place a signature in the Files app or straight from Mail, save it for reuse, and get especially clean results with an Apple Pencil on iPad. For forms, contracts, and documents that need verification, a dedicated browser-based tool adds the fields and polish you need.

The smartest move is to prepare a clean signature ahead of time, whether you save it in Markup or generate a transparent image online. With your signature ready to go, you can turn any document around in seconds, from wherever you happen to be.