How to fill out an email attachment on iPhone

If you send and receive emails using your iPhone, you must learn how to edit email attachments on mobile.

Why? So that you can be more effective and prompt in replying to emails with file attachments.

The last thing you need is to waste time looking for a PC or Mac to edit and send an attachment email. Read on as we take you through ways to fill out an email attachment on your iPhone.

How to edit a PDF attachment on email on iPhone using Markup

Markup is a built-in iPhone feature with some of the best tools for filling and annotating email attachments. Be it a PDF file document or image. Here’s how you can use it to fill your PDF files:

  • Open your email and tap on the PDF attachment.
  • Tap on the Toolbox icon on the bottom-right corner of the screen to enable markup mode.
  • Better still, tap and hold the attachment, then select Markup & Reply from the context menu.
  • Tap the Text (T) button to start filling the PDF document. You can tap, hold, and drag the text box around to any text area field.
  • Tap outside the box to exit.
  • If you make a mistake, tap the Undo button.
  • When you finish filling out the form, tap on Done.
  • The filled document will automatically embed in the email reply, so you simply need to tap the reply button.

Read: How to create a resume in PDF form on iPhone

If you can’t access markup in your mail app, you’ll have to save the email attachment on your device before you fill in the necessary details. Here is how:

  • Open your email app and tap on the attachment file.
  • When it loads the form preview, go to the top-right corner and tap on the Share button.
  • Select Save to Files on the share sheet that pops up.
  • Go to the files app and open the PDF document.
  • Tap on the Markup button in the top-right corner.
  •  The following editing tools will appear at the bottom: pencil, pen, highlighter, eraser, selection tool, ruler, shapes, text field, signature, and a color wheel.
  • Select the Text tool to fill in the text areas on the form.
  • Ensure it aligns properly with the text field on the PDF document. Tap the Text box to open a contextual menu, then tap on Edit.
  • Enter the right text and tap outside the box when you finish to exit edit mode.
  • To adjust the text font, size, color, and alignment tap on the aA button at the bottom.
  • Next, to fill checkboxes, zoom in on the checkbox field and use the pen or pencil tool to mark the checkbox appropriately.
  • If the mark extends beyond the checkbox area, use the eraser to clean up. A pixel eraser will be ideal to remove the extended mark. However, if you want to clear the entire drawing, use the object eraser.
  • Finally, go to the signature area and zoom in to add a signature. Next, tap the (+) button at the bottom and select Signature.
  • A space will open up for you to draw your digital signature.
  • When you finish, tap Done on the top-right side of the screen.
  • Pinch the signature in and out to fit the signature space on the PDF document.
  • Tap Done to save your filled PDF document.

To attach the PDF to your email and send it back, tap the Share button on the screen’s bottom-left corner and select Mail.

Read: I can’t open a PDF on the iPhone or iPad

How to edit a document on iPhone mail with Adobe Fill & Sign

Adobe Fill & Sign makes filling, signing, and sending email form attachments easy and convenient. Here is how it works:

  • First, download and install the app from the App Store.
  • Open the app and create a profile so that it can help you autofill certain details in the future.
  • Select the form you want to fill out. In this case, you’ll select Email attachment. However, the app will access the file from any location. E.g., file browser, web URL, camera roll, and web search. You can even take a picture of the document through the app and start editing.
  • Once you open the form, zoom in and tap on the text field area. Enter the relevant details in the text box.
  • The app will provide suggestions above the keyboard when you type information similar to what’s saved in your profile. You can tap on the correct suggestion to save yourself time.
  • After typing the text, you can adjust the text size to fit snugly in the text area.
  • For the checkboxes, long-press on them, and the app will provide options to input a tick, dot, cross, or dash.
  • If any input elements are not in position, tap and hold them, then slide around to reposition accordingly.
  • To add a signature, tap the Signature button at the bottom and choose Create Signature.
  • The app will provide an empty area in landscape mode so that you can draw your signature.
  • When you finish, tap on Done to save the signature.
  • Place the Signature in the right place and tap Done.

To send the filled PDF attachment via email, tap on Share and select Mail.


With these tips, you can now comfortably type on an email and send it back. So, there’s no cause for worry next time you need to fill out an attachment on an email on iPhone or iPad.

Read: How to compress photos for email on iPhone