CECO PDF

Edit a PDF on an iPhone or iPad

Choose a PDF

To change a word already in a PDF on an iPhone or iPad, open it in CECO PDF in Safari, tap the word, type the right one and apply it. Apple’s Preview and Markup add text boxes on top of the page. CECO PDF changes the word itself, in the document’s font, and refuses what it cannot match.

Open a PDF to correct — it runs in Safari, so there is no app to install.

The PDF you open stays with your documents until you delete it, and for 90 days at most. The privacy notice says what is kept.

What can Preview and Markup do with a PDF on an iPhone?

In Apple’s guide for iOS 27, a PDF is worked on in Preview, an app of its own, and with Markup, the drawing and text tools that open in apps such as Notes and Photos. Apple sums up Preview’s part in two sentences, on its page Annotate a PDF or image in Preview on iPhone: “You can copy, highlight, underline, or strike through text in a PDF file. You can also annotate a PDF or image with stickers, signatures, shapes, or text.”

None of these pages describes changing a word that is already in the PDF. What they add sits on top of the page, and the word underneath stays as it was.

What you want to doPreview and MarkupCECO PDF in Safari
Change a word that is already in the PDFNo: a text box goes on topYes: the word itself
Change a word in a page you scannedNoYes: from the scan’s own letters, or drawn to match
Highlight, underline or strike throughYesYes, with Edit PDF
Add a text box, a sticker or a shapeYesA text box or a shape, with Edit PDF; no stickers
Fill in a formYesYes, with Fill PDF
SignYes, with a fingerYes, with your own mark: Sign PDF
Check that nothing else changedNot describedYes, before you can download

For a highlight, a note, a sticker, a form or a signature, Preview and Markup are the quicker way, and you never leave the phone’s own apps. In Safari, Edit PDF lays text boxes, shapes, highlights and notes over the page too, and Fill & sign fills a form’s blanks and places your own mark. The correction tool is for the other job: a word that is already there, and wrong.

How do I edit a PDF on an iPhone?

  1. Save the PDF where you can find it. Apple’s Files guide says where attachments and downloads go: “View files downloaded from email or the internet: Tap Browse, then tap Downloads in the sidebar.”
  2. Open CECO PDF in Safari, tap “Choose a PDF”, and choose the PDF. If it has a password, type it when you are asked.
  3. Tap the word you want to change. The hint under the page says it the same way: “Tap the word you want to change, or use Find.” Find is the surer route to a word in small type.
  4. Type the right word. The card rises from the bottom of the screen and rides above the keyboard, and the page moves so the word stays in sight above it. Tap “Make this change”.
  5. Read the check. It runs on the server and comes back with the result: how the word reached the page, and outside 0 px. If anything outside the word changed, the correction cannot be downloaded, and Undo is offered.
  6. Download it. The corrected PDF goes where Safari keeps downloads, the same Downloads place in Files.
CECO PDF in WebKit, Safari's engine, at an iPhone's screen size, with an invented letter open and a misspelt word selected for correction
A misspelt word selected for correction, in Safari’s engine at an iPhone’s screen size.

How do I select words with a finger?

A tap selects one word. There is no double-click on a touch screen, so for a line or several words, tap “Select an area” and run a finger over them; without it, a finger dragged over the page scrolls the page, as it would anywhere else. To look at the result up close, open “Look closely”, then drag to move and pinch to zoom.

To delete words rather than change them, empty the field: the button becomes “Delete this”, and the words are deleted rather than covered. On a page of real text, take the space after a word too, by adding it to “It says”, which holds what the selection reads: deleting “twice” alone leaves a double space where “twice ” closes up cleanly. Remove text from PDF says what else to know, such as the record in the file still naming the words.

Does it work on an iPad?

Yes, in Safari, the same way. Apple’s iPad guide, Annotate a PDF or image in Preview on iPad, describes Preview’s tools in the same words as the iPhone’s, and adds: “You can use an Apple Pencil (with a compatible iPad) or draw with your finger.”

In CECO PDF, a finger works on an iPad as it does on a phone: tap the word, or use “Select an area”. The screen is wide enough that the card stays a card rather than a sheet; in a Safari window as narrow as a phone’s, beside another app, it becomes the sheet again. With a keyboard attached, the Mac’s keys work: ⌘↵ applies, ⌘Z undoes and ⌘F finds, and Edit PDF on Mac lists the rest.

CECO PDF in WebKit, Safari's engine, at an iPad's screen size, with an invented letter open and a misspelt word selected for correction
A misspelt word selected for correction, in Safari’s engine at an iPad’s screen size.

How large a PDF can I open on a phone?

As large as on a computer: the server sets the limits, not the phone. On the free plan, 15 MB and 50 pages a file, and 10 corrections a day; paid plans raise them, as the pricing page says. A page from a phone’s own scanner can be very large, so the picture of it sent to your screen is drawn at a lower resolution to make sure it arrives. The check does not change: it runs on the server, at 300 dots per inch for a scan, on the page itself.

Correct only documents that are yours, or that you are entitled to alter: the terms say who may, and every correction carries your confirmation that you are authorised to make it. Identity documents are refused when they are uploaded.

Questions people ask

Can I edit a PDF on my iPhone?

Yes. Preview and Markup add text boxes, highlights and signatures over the page. To change a word that is already in it, open the PDF in CECO PDF in Safari, tap the word and type the right one.

How do I edit a PDF on my iPhone for free?

Correcting is free to try: 10 corrections a day on the free plan, and you see the result before you pay. Signed in, your first corrected download each day costs nothing; after it, one takes a credit or a plan. One document costs €0.99, once, with no subscription needed. The pricing page has the plans.

Is there an app to install?

No. CECO PDF is a web page that runs in Safari, so there is nothing to install and nothing to keep up to date. It sees only the PDF you choose to open.

Can I edit a PDF I scanned with my iPhone?

Yes. A scan from Preview’s Scan Documents is a picture of the page, and CECO PDF changes the word in the picture: from the scan’s own letters where it can, or drawn to match. Edit a scanned PDF says more.

Where does the corrected PDF go?

Where Safari puts downloads: in the Files app, under Browse, then Downloads, as Apple’s Files guide says. From there you can share it or move it.

Can I fill in a form or sign a PDF on my iPhone?

Preview does both. In Safari, so does CECO PDF: Fill PDF fills a form’s fields and the blanks of a flat or scanned form, and Sign PDF places your own signature or initials.

Will the new word match the font?

In a PDF with real text, it is typed in the document’s own font. In a scan, it is made to match the letters beside it, and refused when the face cannot be identified with confidence. Edit PDF text says how.

Can I edit a PDF on an Android phone?

Yes: CECO PDF is a web page, so it works in an Android phone’s browser as it does in Safari, with the same taps. Edit PDF on Android has the steps, and what Google’s own apps do there.

Related pages

Sources

Each page below was read on 29 October 2026, on its maker's own support site, in Apple’s guides for iOS 27 and iPadOS 27. What another program can do is said only as its maker says it.

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