Best iPhone Apps for Filling Nonfillable PDF Forms
The best iPhone app to fill nonfillable PDF forms depends on the job: start with Apple’s built-in text boxes and Markup for a simple form. PDF Expert offers dedicated text, checkmark and date tools; Adobe Acrobat offers text, checkbox marks and initials. PocketSign is a paid option for placing all four on-device. You do not need interactive fields: add your answers over the page, review them, then return the completed PDF.
This website belongs to PocketSign. This comparison uses current Apple and developer documentation, not hands-on testing. It does not name PocketSign—or any app—the universal winner.
Why can’t I type into this PDF form?
A form can look fillable without containing any interactive fields. Adobe distinguishes flat forms from interactive forms: flat PDFs are often scans or static pages with no embedded fields. Tapping a printed blank therefore may not open a keyboard.
For that kind of PDF, use a text-box or Fill & Sign tool to put answers on top of the page. That completes your copy; it is not the same as authoring reusable interactive fields for future recipients. A drawn checkmark also does not create a clickable checkbox.
Which iPhone PDF form fillers are worth comparing?
These are workflow choices, not a ranked league table. The linked sources document the capabilities and limitations. Scroll the table horizontally on a phone if needed.
| Option | Documented tools | Useful when | Real limitation |
|---|---|---|---|
Apple text boxes / Markup | Place text, type dates, draw marks and save signatures or initials. | A short form using tools already available on iPhone. | Dates and checkbox marks can require manual typing or drawing rather than dedicated controls. |
PDF Expert | Text, Checkmark, Cross and Date; adjust date format in Properties. | A flat form with repeated dates and boxes. | Dynamic XFA forms are not supported. |
Adobe Acrobat | Text boxes, combed text, checkmarks, crosses, signatures and initials. | Character-by-character boxes or a dedicated initials workflow. | The guide describes account sync after offline work; offline is not a no-upload guarantee. |
| PocketSign | Tap to place text, dates, checkboxes and initials; drag, resize, undo and redo. | Your own form completed on-device and exported as a flattened copy. | Filling requires Pro; optional online signing requests upload after confirmation. |
How can I fill a PDF with no interactive fields using Apple’s tools?
Apple’s form guide documents Add Text Form Box for placing text beyond existing fields. Its Preview guide also describes adding text boxes and signatures. Controls vary with the app and iOS version.
- Save a working copy of the attachment and open it.
- Open the form-filling or Markup controls. Choose Add Text Form Box, or Add Text in Markup.
- Type an answer, position it over the blank and adjust its size.
- Type the date in the format requested. Use a drawing tool for a checkbox mark, or place an “X” using text.
- Add initials as text, or draw them through Add Signature. Apple supports saving initials for reuse.
- Save and reopen the completed file before sharing.
Apple documents text formatting and drawing tools. This is a sensible first attempt for a short form, though individually positioning many entries may be repetitive.
Which app helps with dates, checkboxes and initials on an emailed form?
For repeated dates and checkbox marks, PDF Expert is a useful candidate. Its non-interactive form instructions specify Fill & Sign → Text, Checkmark or Cross, and Date. Tap the date and open Properties to change its format. Initials can be entered as ordinary text when that matches the sender’s instructions.
Acrobat offers a dedicated initials tool. Adobe’s mobile guide covers Signature → Add initials, checkbox symbols and Combed text for individual character boxes. Type a date as text. Adobe says basic filling and signing require no subscription; advanced PDF editing is a separate paid capability. Its guide also warns that saved signatures and initials become permanent, so review before saving.
PocketSign is another option if a paid on-device workflow suits you. Its listing documents placing text, dates, checkboxes and initials anywhere, plus a flattened export that leaves the original untouched. The limitation is meaningful: filling requires a monthly or yearly Pro subscription. Own-document work stays local according to the listing, but confirming an online signing request uploads the file. See the PocketSign overview for that distinction.
How do I return the completed attachment without sending the blank original?
Use this checklist regardless of app:
- Keep the original and give the completed copy a distinct filename.
- Inspect every page: dates, checkbox choices, initials, clipping and tiny text.
- Reopen the exported PDF, not just the editing view.
- Attach that completed file to your reply. Apple documents attaching a file from Files in Mail.
- Ask before flattening if the recipient needs editable fields. PDF Expert’s flattening guide explains that annotations become fixed and recommends keeping a master copy.
If avoiding uploads matters, check storage and sharing settings too. Our on-device PDF signing comparison treats that as a separate requirement.
Frequently asked questions
Do I need OCR to fill a scanned PDF?
Not for simply placing answers over visible blanks. PDF Expert’s flat-form workflow uses text and marks without requiring OCR. That is different from recognizing or rewriting the scan’s existing text.
Will typing over a form make its boxes interactive?
Do not assume so. This workflow adds your answers visually. If you need a reusable form with clickable fields, ask for an interactive version or use a form-authoring workflow instead.
What if the PDF does not display properly?
Ask the sender for a standard PDF or the required submission method rather than forcing a broken preview. For example, Readdle explicitly excludes dynamic XFA forms. A compatibility problem is different from an ordinary flat form.