How to Sign or Fill In a PDF on iPhone
A PDF can be signed or completed on an iPhone with Apple’s built-in Markup tools. Open the file in Files or Mail, select the Markup option, add a saved or new signature, and place the signature in the required field. Text boxes, checkmarks, and handwritten notes can also fill out a PDF form.
Steps
- Open the PDF in the Files app, Mail, Messages, or another compatible app.
- Tap the Markup icon, usually shown as a pen tip, then tap +.
- Select Add Signature to create a signature with a finger or choose a saved signature. Drag the signature to the correct location and resize it.
- Select Text to enter information into blank fields. Use drawing tools for checkmarks, initials, or handwritten entries.
- Tap Done, then choose Save to Files, Share, or Send to store or return the completed document.
Common Issues and Fixes
- Markup is missing: The PDF viewer may not support editing. Open the PDF through the Files app or use the Share menu to select Markup.
- Text does not align with a form field: The PDF may not contain interactive fields. Add a text box manually and resize the text to fit.
- The signature appears too large: Select the signature and drag a corner inward. Move the signature after resizing.
- The completed PDF loses edits: Closing the document without saving can remove changes. Select Done and save a separate copy before sharing.
- A password prevents editing: A protected PDF may restrict signing or changes. Request an unlocked copy or enter the required password.
💡Protip:
Save the original PDF before adding a signature, use existing interactive fields when available, and review every page before sending the completed document.
Quick Tips
- Save the original PDF before adding a signature. A separate copy preserves the unsigned version.
- For fillable PDFs, tap the existing field before adding a text box. Interactive fields usually provide better alignment.
- Use landscape orientation for wide forms. More space makes small fields easier to edit.
- A scanned document may require manual text boxes because scanned pages often contain images rather than editable fields.
- Review every page before sending. Signatures, dates, initials, and required checkboxes can be easy to miss.
Related Questions
Can an iPhone add a signature to a PDF without an app?
Yes. The Files app and Apple Markup can add a signature without installing a separate PDF editor. Advanced functions, such as certificate-based digital signatures, may require a specialized app.
How can a PDF form be filled out on an iPhone?
Open the PDF in Files, tap Markup, and use existing fields or the Text tool. Save the completed file as a new PDF before sharing.
