Edit a PDF on iPhone: when Preview's markup is not enough

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What the iPhone already does, and what it does not

Since iOS 26 the iPhone has a Preview app, and Apple’s iPhone User Guide for iOS 26 lists what it does with a PDF (checked on 11 October 2026):

• Fill out and sign forms: tap the Form Filling button, tap a field and type; a signature field takes your finger.
• Annotate: highlight, underline or strike through selected text, and add stickers, signatures, shapes or text.
• Pages: insert a blank page, insert pages from a file or a scan, delete, rotate, move and crop pages.
• Lock a PDF with a password, and scan paper into a PDF.

That covers most paperwork, and it is already on the phone: for a form, a signature or a highlight, use it. What none of Apple’s Preview articles offers is the job this page is about: changing a word that is already in the document. A text annotation sits on top of the page; the old words stay underneath, in the file, where search and copy still find them.

Job	Preview on iPhone (Apple’s guide)	getPDF in Safari
Retype a word already in the PDF	Not offered	Yes: double-tap the line
Add new text, a signature, a shape	Yes	Yes
Highlight, underline, strike through	Yes	Yes
Fill form fields	Yes	Yes
Find and replace across the file	Not offered	Yes
Move or delete a picture already in the PDF	Not offered	Yes
Insert, delete, turn, move pages	Yes	Yes
Take content out for good (redact)	Not offered	Yes

Edit the text in Safari, step by step

1. Open Safari and go to getpdfs.app/edit. No app, no account.
2. Tap Choose a PDF. The Files browser opens: Recents, iCloud Drive, On My iPhone or Downloads. Tap the PDF. The first time, the page fetches its engine (4.6 MB, once); after that it is kept on the phone.
3. Zoom to the line. Pinch with 2 fingers on the page; 1 finger scrolls.
4. Double-tap the line to open it for editing (or tap once, then Edit in the bar at the bottom). The iOS keyboard comes up.
5. Type the fix, for example the invoice total from 1,190.00 to 1,250.00, then tap return or tap outside the box.
6. Tap Save. Safari saves the copy, named after your file with -edited on the end, and a download button appears next to the address field.

The changed words are real text. Open the saved file in Preview, search for the new total and it is found; search for the old one and it is not, because the editor writes the file anew rather than covering the old line.

Where the edited file goes

Into the Downloads folder in the Files app. Apple’s support article “Where to find downloads on your iPhone or iPad” places that folder in iCloud Drive by default (checked on 11 October 2026). From Files, touch and hold the PDF and choose Share to send it by Mail, Messages or to a portal.

Your original is not touched: the editor never writes over the file it opened. And nothing passed through a server on the way. You can check that yourself: edit 1 file with a connection, switch on aeroplane mode, and edit another. It works the same, because the page and its engine are kept on the phone and the file never needs to travel.

iPhone realities, said plainly

• Memory. Safari does not tell a page how much memory the phone has, so the editor assumes it may use about 1.5 GB and holds about twice the file’s size to open it. A very long scan may be refused, with a sentence that says how much it needs. Compress it first (our 10-page, 17.6 MB colour scan comes out at 1.7 MB with the Email preset of Compress PDF; make a PDF smaller explains the options), or do that job on a computer.
• Fine positioning. Dragging a picture to an exact spot is fiddly under a finger. Text fixes, fields, highlights and signatures are not.
• Private browsing. The recovery copy (the editor keeps your unsaved work in Safari’s storage, so an accidental swipe away does not lose it) lives only as long as a private tab does. The More sheet says whether a copy is being kept.
• Scans. A scanned page has no text to retype until OCR PDF adds a text layer.

The full phone layout (the bottom tool bar, the Pages sheet, what touch does in each tool) is in editing a PDF on your phone. For forms and signatures, the signing and filling guide compares the built-in route with ours.

The honest part

If the job is filling, signing or marking up, Preview on the iPhone does it well and is already installed; this page does not try to talk you out of it. Come to the browser editor when the words themselves must change. Even then it has limits: a retyped line stays 1 line and does not wrap, and when the PDF’s own font lacks a letter you type, the editor sets that line in a bundled Liberation font with the same letter widths and tells you so. Liberation covers Latin, Greek, Cyrillic and Vietnamese; text in Arabic, Hebrew, Chinese, Japanese, Korean, Thai or an Indic script is refused with a message naming the script, rather than written as empty boxes. The editing guide covers all of it in detail.