How do I annotate PDFs on iPhone for free?

Apple shipped free PDF annotation tools in iOS 15 and they've gotten better every year. By 2026, you don't need a paid PDF app for most annotation tasks. Here's the full toolkit.

Built-in tools:

1. Quick Look / Files (anywhere)

• Tap any PDF in Files, Mail, Messages, or Safari.
• Tap the markup icon (pencil tip in a circle) in the top-right.
• The markup toolbar appears with:

- Pen (freehand drawing)

- Highlighter

- Pencil (rougher freehand)

- Eraser

- Lasso (select annotations to move)

- Color picker

- + button → Text, Signature, Magnifier, Shapes

• Annotate, then tap Done → Save.

The annotated PDF saves over the original (or as a copy if you choose).

2. Apple Notes (best for new annotations + organization)

• Open Notes → new note.
• Drag and drop or paste a PDF.
• Tap the PDF preview → annotation toolbar appears.
• Annotate as above.
• Notes also lets you handwrite alongside the PDF with Apple Pencil — useful for studying.

3. Apple Books (best for reading + highlighting long PDFs)

• Save the PDF to Books (Share → Books).
• Tap to read.
• Long-press text → Highlight, Underline, or Add Note.
• View all highlights/notes from the contents menu.

Books is better than Files for reading long PDFs because it remembers your last page and preserves a clean reading experience.

4. Preview (Mac) ↔ iCloud (cross-device)

If you annotate on Mac via Preview, your annotations sync to iPhone via iCloud Drive. Same in reverse.

Apple Pencil on iPad (handwritten annotations):

iPadOS adds Apple Pencil support for handwritten notes directly on PDFs. The handwriting is recognized as text via Scribble, so it's searchable.

Common pain points and workarounds:

• Form filling: tap a form field. If it's a fillable PDF, the keyboard appears. If not, use the Text tool to overlay text. iOS doesn't auto-detect non-form-PDF fields.
• Signatures: in the markup toolbar, tap + → Signature. Sign once with your finger, save, reuse.
• Annotations not saving: ensure you tap Done → Save after editing. Just closing the app discards changes.
• PDF too large for Quick Look (over 500 MB): use Files' built-in viewer or Books — Quick Look has a memory limit.

When to use a paid PDF app:

The built-in tools cover ~95% of annotation needs. You only need a paid app if you:

• Need OCR on scanned PDFs (PDF Expert, Notability).
• Need to redact (PDF Expert).
• Need advanced form filling for legal/business forms.
• Want a unified library across iPhone, iPad, Mac, with cloud sync (Notability, GoodNotes).

For organizing dozens or hundreds of annotated PDFs (research, contracts, manuals), a PDF organizer like Némos lets you tag, fold, search across all annotations on-device.

The 2026 verdict:

For 95% of users, free iOS tools are enough. Save the $30/year for a coffee.

## Why this question gets asked so often

PDF annotation on iPhone was a paid-only feature for the first 8 years of iOS (2007-2015). Apple shipped Markup in iOS 9 (2015) — the same year they shipped Apple Pencil for iPad — and progressively expanded the tool through every major iOS release. By 2026, Markup's capabilities rival what PDF Expert and Adobe Acrobat charged $50-100/year for in 2018. The annotation-related search traffic remains high because users who started paying for PDF Expert or GoodNotes in 2017-2020 don't realize Apple's free tools caught up. App Store reviews of PDF Expert consistently include "Wait, why am I paying $80 for this when Notes does the same thing?" questions. The persistence of the question reflects pricing inertia — once you've paid for a tool, the switching cost feels higher than it actually is.

## The deeper story

Apple's Markup framework uses PencilKit (introduced WWDC 2019) for stroke rendering and PDFKit for the underlying PDF manipulation. The same Markup tools that work on PDFs also work on photos, screenshots, and email attachments — meaning iOS users have a single annotation vocabulary across content types. This is genuinely unusual; most platforms have separate annotation tools per file type. The 2024 iOS 18 update added Squiggle correction (transforms wobbly handwriting into clean text), which started to bridge the handwriting-to-typed gap that GoodNotes and Notability had monopolized. The Apple Pencil Pro (Q2 2024) added squeeze gestures for tool switching and gyroscope-aware barrel rotation for varied brush angles. By 2026, iPad with Apple Pencil Pro + Notes is genuinely competitive with $90/year GoodNotes 6 for most academic and student workflows. The academic note-taking research literature shows minimal accuracy difference between platforms when the underlying writing skill is constant.

## Edge cases and gotchas

• Annotations vs flatten: edited PDFs save with annotations as a separate layer (removable). Use "Flatten PDF" via Shortcuts to permanently bake them.
• Multi-page PDFs: Markup only shows the current page in edit mode. To annotate across pages, save and reopen each.
• Form fields vs free-text annotations: a fillable PDF form should be filled in the form fields, not annotated with text overlay.
• PDFs from Mail: annotations don't save back to the email; you have to save to Files first.
• Apple Pencil delays: typing while annotating with Pencil sometimes lags on iPhone (better on iPad).
• Handwriting search: handwritten annotations on PDFs aren't searchable unless the app converts them to text (GoodNotes does this; Notes doesn't yet for PDFs).
• Signature reuse: saved signatures sync via iCloud but only between Apple devices.
• Eraser quirks: the eraser tool removes entire strokes, not pixels. Easy to over-erase.

## What competitors say

PDF Expert ($79.99 one-time or $14.99/month) is the most powerful — true text editing, redaction, OCR, multi-tab. GoodNotes 6 ($9.99/year) targets students with handwriting-to-text and study aids. Notability ($14.99/year) similar to GoodNotes with emphasis on audio recording sync. Adobe Acrobat Reader is free for basic; $14.99/month for editing. Foxit PDF Mobile is the Adobe Acrobat alternative at $14.99/year. Documents by Readdle combines file management with PDF tools. OneDrive PDF is free with Office 365. Notion annotates PDFs uploaded to pages but limited. Bear and Obsidian delegate PDF annotation to Markup. Apple Notes is the integrated path for capturing + annotating + searching together. Némos doesn't position as a PDF editor — it organizes and indexes PDFs but defers annotation to Markup.

## Bottom line

For routine annotation (highlights, signatures, freehand notes), Apple's free Markup tools across Files, Notes, Books, and Mail are sufficient. The only reasons to pay for a dedicated PDF app in 2026 are: (1) OCR on scanned PDFs (PDF Expert, Notability), (2) advanced redaction for legal/HIPAA work (PDF Expert), (3) handwriting-to-text on iPad (GoodNotes), (4) cross-platform sync with Windows/Android users (Adobe Acrobat). For everyone else, the $30-120/year you'd spend on a PDF app is better invested elsewhere. The biggest free workflow improvement: install the Markup keyboard shortcut on iPad — it makes annotation as fast as paid apps.