How to Edit a PDF on iPhone (Built-In, No App)
The short answer
You can edit a PDF on an iPhone with the built-in Files app — no downloads needed. Open the PDF, tap the pencil icon, and you can add text, highlight, draw, and sign. For heavier editing (changing existing text, merging files), you’ll need an app, and most good ones cost money.
Edit a PDF with the Files app (free, built-in)
- Save the PDF to the Files app (AirDrop, or download it there).
- Tap the file, then tap the pencil icon in the top-right corner.
- Use the toolbar: text box to add text, highlighter, pen for drawing, and the plus menu for signatures.
- Tap Done → save, and share it wherever it needs to go.
This covers the most common “edit” requests: adding a note, signing a contract, filling in a line. It’s genuinely enough for most people.
What you can’t do with the free option
The honest limits of the Files app editor:
- No rewriting existing text. You can add text on top of the page, not change the words already there. That’s true on every platform — see typing on a PDF.
- No merging or splitting. Combining files on an iPhone needs an app. The browser route works though — most online merge tools work fine in Safari.
- No OCR. A scanned PDF stays a photo; you can’t select its text. That’s a paid-app feature or a desktop job.
If you need a real editor app
For changing text inside the PDF, the App Store’s serious options are PDF Expert and similar — they’re good, and they cost money (subscription or one-time). Free editors on the App Store exist but almost all watermark your file or cap page counts. Rule of thumb: on a phone, the built-in tools handle 80% of editing; the rest is easier done on a computer anyway.