You can fill out PDFs directly on your iPhone using the built-in tools or third-party apps

Your iPhone can open and edit PDFs without installing anything extra. The Files app, Notes app, and Mail all let you mark up documents, fill in text fields, and sign forms. If you need more control — like saving multiple versions or working with complex forms — third-party apps like Adobe Acrobat Reader, GoodNotes, or Notability give you more options. The right choice depends on whether you're signing a straightforward lease or managing dozens of forms for work.

Most forms you'll encounter on iPhone fall into two categories: interactive PDFs with built-in text fields and checkboxes, and image-based forms where you write on top of the document. Your iPhone handles both, but different apps work better for each type. Starting with what's already on your phone costs nothing and covers everyday situations.

Key Takeaways

  • The built-in Markup tool in Files, Mail, and Notes works for basic form filling, signatures, and annotations without paying anything.
  • Adobe Acrobat Reader (free version) lets you fill text fields, add signatures, and save the completed form back to your device.
  • GoodNotes and Notability are better if you write by hand with an Apple Pencil or need to organize multiple documents in notebooks.
  • You can sign documents using your finger, a stylus, or a saved signature image — the method depends on which app you use.
  • Most apps let you email the completed form directly, but check whether the recipient's system accepts the file format you're sending.

Using the built-in Markup tool for straightforward forms

The fastest way to fill a form on iPhone is through Markup, which comes with iOS. Open the PDF in Files, Mail, or Notes, tap the Markup button (it looks like a pen tip in a circle), and you can add text, draw, sign, or highlight. Tap the text tool, then tap where you want to type — the keyboard appears and you can fill in fields directly. This works well for forms with clear text boxes, like rental applications or permission slips.

To sign the document, tap the signature tool, draw your name with your finger, and it appears on the page. You can redo it as many times as you need. When you're done, tap Done and the changes save to that file. This method is free and requires no setup, but it's limited to basic marking and typing — you can't rearrange fields or create complex layouts. For most one-time forms, Markup is all you need.

Adobe Acrobat Reader for form fields and saved signatures

Adobe Acrobat Reader (the free version) recognizes form fields that were built into the PDF, so you can tab between them and fill them in like you would on a computer. Open the PDF in the app, tap the pencil icon, and you'll see which fields are fillable. Type in each one, and the app remembers your entries. If the form has checkboxes or dropdown menus, you can interact with those too.

The app also lets you save a signature once and reuse it on every document. Go to Settings inside Acrobat Reader, tap Signature, and create one by drawing or uploading an image. After that, you can add it to any form with one tap instead of redrawing it each time. When the form is complete, you can email it directly from the app or save it to Files, iCloud Drive, or Dropbox. The free version covers most everyday forms — the paid version adds features like combining multiple PDFs or removing pages.

GoodNotes and Notability for handwritten forms and organization

If you write by hand or use an Apple Pencil, GoodNotes and Notability let you fill forms the way you would on paper. Both apps import PDFs and let you write directly on them with a stylus or your finger. GoodNotes is simpler and faster for quick annotations; Notability includes audio recording (so you can record yourself while filling the form) and more drawing tools. Both cost money upfront — GoodNotes is around $8 and Notability is around $12 — but neither has subscriptions.

These apps shine if you're managing multiple forms or documents. You can organize PDFs into notebooks, add tabs, and search your handwriting across all your documents. If you need to keep a record of forms you've completed or refer back to them often, the organization features save time. The downside is that handwritten text isn't searchable the way typed text is, and some recipients may expect a typed form rather than a handwritten one.

Typing text into forms on your iPhone

When you tap a text field in Markup or Adobe Acrobat Reader, the keyboard appears and you type normally. The text size usually adjusts to fit the field, but if it doesn't, you can pinch to zoom in on that part of the form and try again. If the form has many fields, Adobe Acrobat Reader is faster because you can tap the next field button to move between them without lifting your finger.

For longer answers — like a description or explanation — type in Notes first, then copy and paste it into the form field. This prevents you from losing your work if the app closes unexpectedly. Some forms have character limits; if you hit one, the field stops accepting text. Check the original form instructions to see if there's a limit before you write something long. If you're filling the same form multiple times, save a copy of your answers in Notes so you can paste them again later.

Adding and managing signatures on iPhone

You have three ways to sign on iPhone: draw with your finger, use an Apple Pencil, or upload an image of your signature. In Markup, tap the signature tool and draw your name in the box that appears — you get three tries, and you pick the one that looks best. In Adobe Acrobat Reader, you can save a signature in Settings and use it on every form without redrawing.

If you have a consistent signature you use everywhere, create it once in Adobe Acrobat Reader and it syncs across your devices if you're signed into the same Adobe account. If you prefer a more formal look, you can sign a piece of paper with a pen, photograph it, and upload that image as your signature in some apps. The method you choose depends on how official the document is — a handwritten signature is fine for most personal forms, but some legal documents may require a specific type of signature.

Saving and sending completed forms from your iPhone

After you finish filling a form, the app saves your changes automatically. In Files or Mail, the edited PDF stays in the same location. In Adobe Acrobat Reader, tap the three dots menu and choose Save to keep your changes, or Share to email it, send it to cloud storage, or print it. GoodNotes and Notability save to their own libraries, so you need to export the PDF if you want to send it elsewhere.

To email a completed form, open the app's share menu and select Mail. The form attaches as a PDF and you can type your message and send it. Check with the person or organization receiving the form to confirm they accept PDFs — most do, but some older systems only accept specific formats. If the recipient needs a different file type, ask them what works, because not all iPhone apps can convert to formats like Word documents. Keep a copy of the completed form in Files or iCloud Drive in case you need to reference it later.

Choosing between apps based on what you're filling

Use the built-in Markup tool if you're signing a single document or filling out a straightforward form once. It's free, fast, and requires no setup. Use Adobe Acrobat Reader if you fill forms regularly or need to save a signature you reuse — the free version covers most needs. Use GoodNotes or Notability if you write by hand, use an Apple Pencil, or need to keep organized records of multiple documents.

If you're not sure which app to try, start with Adobe Acrobat Reader. It's free, works with almost any PDF, and handles both typed and handwritten input. If you find yourself wishing you could organize documents better or write more naturally, try GoodNotes or Notability. Most people end up using one main app for regular forms and Markup for quick one-off signatures.

Frequently Asked Questions

Can I fill out a form on iPhone and send it to someone on Android?

Yes. When you save a form as a PDF on iPhone, it's a standard PDF file that Android phones, computers, and any email system can open. The recipient sees your filled-in form the same way they would if you'd filled it on a computer. Make sure you save or export the completed form before sending it, so the recipient gets the version with your answers in it.

What if the form won't let me type in a field?

The field might not be a text field — it could be a checkbox, dropdown, or image-only form. Try tapping it to see if a menu appears. If nothing happens, the form may have been created as an image rather than an interactive PDF. In that case, use Markup to draw or write on top of it instead of typing. If you're using Adobe Acrobat Reader, try switching to the drawing tool instead of the text tool.

Can I fill out the same form multiple times and keep different versions?

Yes, but you need to save each version with a different name. In Adobe Acrobat Reader, after you fill the form, tap the three dots menu and choose Save As to give it a new name. In GoodNotes or Notability, you can duplicate the document before filling it out, so you have a blank copy to use again.

Do I need to buy an app to fill forms on iPhone?

No. The built-in Markup tool and Adobe Acrobat Reader (free version) handle most forms. You only need to buy GoodNotes or Notability if you want handwriting features or document organization that the free apps don't offer. Most people complete forms fine with just the free options.

Can I use my Apple Pencil to fill out forms?

Yes, if you have an iPad with Apple Pencil support and an app that accepts it. GoodNotes and Notability both work with Apple Pencil on iPad. On iPhone, you can only use your finger because iPhones don't support Apple Pencil. If you need to use a stylus on iPhone, some third-party styluses work with the touchscreen, but they're less precise than Apple Pencil on iPad.