PDFViewerHow to annotate a PDF on iPad
To annotate a PDF on an iPad, open Safari, go to pdfviewer.work, tap Open a PDF and choose the file from Files; then highlight, draw with the Apple Pencil or a finger, add text or a signature, and tap Download to save the marked-up copy. No app is installed, no account is needed, and the file stays on the iPad.
Annotate a PDF on iPad in Safari: step by step
- Open Safari and go to pdfviewer.work (or the annotate PDF page).
- Tap Open a PDF. The Files picker appears; choose the document from iCloud Drive, On My iPad, Downloads or a cloud service you have added to Files.
- Mark it up. Highlight drags over text in one of seven colors. Draw takes Apple Pencil or finger strokes. Text types a note with the on-screen or attached keyboard. Signature draws a signature and places it. Sticker drops a quick marker. Ctrl+Z on a keyboard, or the Eraser, undo mistakes.
- Tap Download. Safari saves the new PDF to the Downloads folder in Files (change that in Settings, Safari, Downloads). The original is untouched.
A second workflow: when a PDF is open in Safari from a link, use the share button, Save to Files, then open it in the viewer from there.
Apple Pencil, finger and keyboard on the viewer
The Draw tool records whatever the touchscreen sends, so Apple Pencil strokes and finger strokes both become ink on the page. For margin notes on a research paper, the Pencil with Draw is the fastest; for a legible comment someone else will read, Text with the keyboard is better. The full breakdown of typing versus handwriting is on how to write on a PDF.
Highlighting works by dragging across text, with a finger or the Pencil. Use the zoom controls before working on small print; strokes land where you draw them, so a zoomed page gives you more precision. The draw on PDF page lists what the Draw tool can and cannot do.
Built-in and app alternatives on iPad
| Option | Good for | Trade-off |
|---|---|---|
| Files app, Markup | Quick pen marks and a signature on a one-page form | No real text search; limited highlight control |
| Apple Books | Reading long PDFs with page curl and notes | Annotations stay in Books unless exported |
| Notes app | Scanning paper and scribbling on it | Not a PDF editor; exports flatten everything |
| Adobe Acrobat Reader app | Fillable forms and comments that sync to Acrobat on a desktop | Account prompts; large app |
| GoodNotes, Notability | Hours of handwritten lecture notes over slides | Paid apps; their own file format until exported |
The browser viewer sits in the middle: more tools than Markup, no app to install, nothing uploaded, and the same on an iPhone; see PDF editor for iPhone.
Reading long PDFs on iPad in the viewer
Annotation is half the job on a tablet; the other half is reading. The thumbnail sidebar moves through a 60-page paper faster than swiping, and Search finds a term across the whole document with next and previous buttons, provided the PDF has a text layer; a scan needs OCR first, which is slow on an iPad. The dark theme helps on an evening flight, and the zoom controls plus the hand tool handle a wide table or a drawing that does not fit the screen.
To print from the iPad, tap Print; Safari's print dialog appears and sends the page to an AirPrint printer. To check page count or author, open Document properties from the toolbar. None of this needs an app, and because the PDF is processed in the tab, the file does not leave the iPad.
When a document is both read and annotated over several days, download after each session; the tab does not keep the file once it is closed.
Limits on iPad, and how to work around them
- Big scans are slow or crash the tab. A 300-page scan at high resolution can exceed Safari's memory on an iPad. Delete the pages you do not need on a computer first, or split the file, then annotate the smaller piece.
- OCR takes a long time. Recognizing a scan runs on the iPad's processor and is slower than on a laptop. Run OCR on a computer once and share the searchable copy to the iPad.
- Form fields do not take typing. The viewer shows fields but does not edit them as fields; type over them with Text, or use Acrobat Reader for a form that must keep field data.
- The file asks for a password. The viewer cannot open encrypted PDFs. Remove the password on a computer first.
- Download seems to do nothing. Look in the Files app, Downloads. Safari shows a small download icon in the address bar once the file is saved.
Frequently asked questions
How do I annotate a PDF on iPad for free?
Open Safari, go to pdfviewer.work, tap Open a PDF, pick the file from Files, then highlight, draw or type and tap Download. No app, no account.
Can I write on a PDF on iPad without an app?
Yes. Safari runs the viewer in the browser; the Draw tool takes Apple Pencil or finger strokes and the Text tool types. Markup in the Files app is the built-in alternative.
Does Apple Pencil work for drawing on a PDF in Safari?
Yes. Pick Draw and write with the Pencil; the strokes become ink in the PDF when you download.
Where does the annotated PDF go after I download it on iPad?
To the Downloads folder in the Files app by default. You can change the location under Settings, Safari, Downloads.
Why is my PDF slow on iPad?
Large scans with hundreds of pages use a lot of memory, and Safari on iPad has less to give than a laptop. Trim the file on a computer or annotate a smaller part.
Can I highlight a PDF on iPad?
Yes. In the viewer, tap Highlight, choose a color and drag across the text with a finger or the Pencil, then download the copy.