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10 Apple Preview Tips and Tricks for PDF and Image Editing on Mac
Every Mac ships with Preview set as the default viewer for PDFs and images. Double-click either file type and it opens automatically, no setup, no subscription, no App Store. Most users treat it as a passive file opener before reaching for something else. That habit costs time and, in some cases, money.
Preview handles page management, redaction, background removal, format conversion, and signatures without additional software, as Digital Trends reported last month. What can Apple Preview do, exactly? More than most users ever find out. This guide covers the 10 features most likely to replace tools you'd otherwise pay for.
One honest constraint up front: Preview cannot edit existing text inside a PDF, run OCR on scanned documents, or export to Word. Everything here stays within what it actually does well, which covers more ground than most users expect.
Platform note: all 10 tips apply to Mac. Apple introduced a standalone Preview app with iOS and iPadOS 26, but password protection, color adjustment curves, and Quartz filters appear to be missing from the mobile version, as Macworld noted in its review.
PDF management: four tasks most people pay a separate app to handle
This is where Preview earns its keep. Merging documents, reordering pages, extracting a section, and filling forms typically require a dedicated PDF utility. Preview handles all four on standard text-based PDFs without leaving the app you already have open.
Tip 1: Rearrange or delete pages using the thumbnail sidebar
Reveal the sidebar via View → Thumbnails, or press Option-Command-2. From there, drag page thumbnails into any new order. Select a thumbnail and press Delete to remove that page entirely, per Digital Trends. Macworld confirms that sidebar-based reordering and deletion work reliably on standard text-based PDFs.
Warning: Make a duplicate before rearranging anything, via File → Duplicate, so you have a clean original to fall back on.
Tip 2: Merge multiple PDFs or extract specific pages
With the thumbnail sidebar open, drag a second PDF into the sidebar to merge it at that position. To extract pages, select their thumbnails and drag them to the desktop. Preview saves the selection as a new standalone PDF with no extra export step, according to Digital Trends.
Practical scenario: a 12-page contract where you only need to share pages 3 through 5. Select those thumbnails, drag to the desktop, done.
Tip 3: Fill PDF forms with the AutoFill helper (macOS Sonoma and later)
When Preview detects form fields in a PDF, an AutoFill Form button appears in the upper-right corner of the window. Click it and editable fields highlight in pale blue. If the button doesn't appear, click the Show Form Filling Toolbar icon manually and place text fields yourself. Hold Option while dragging a field to duplicate and reposition it, as Macworld explains.
Gotcha: Detection is imperfect. Macworld found that even well-structured forms sometimes generate only a partial set of fields. Scan the document manually after AutoFill runs, before filling anything in.
Security and privacy: protect and permanently redact
Sending a contract, invoice, or document with personal information? Preview has two tools that address real privacy needs without installing anything extra.
Tip 4: Lock a PDF with a password and set recipient permissions
Open the PDF, click the Info button in the toolbar, find the security lock icon under Permissions, and select Edit. Check the box requiring a password to open the file, set the password, and save. The same permissions panel controls what a recipient can do without the full password, for example allowing printing while blocking copying or further editing, per Digital Trends. Password protection is also available at export: File → Export as PDF includes password, Quartz filter, and restriction options, as Macworld confirms.
Worth noting: these permissions govern what compliant PDF readers will allow. Third-party tools may handle them differently, so treat this as a practical deterrent rather than an encryption guarantee.
Tip 5: Permanently redact sensitive content
Open the Markup toolbar and select the Redact tool. Drag across any text or region and it renders as a solid black block. Unlike placing a black shape on top of content (which can be removed), Preview's redaction permanently obscures the underlying information, according to Digital Trends.
Critical warning: Once you save a redacted file, that information is gone. Digital Trends is explicit on this point. Keep an unredacted copy before applying any redactions. Common applications include removing account numbers, phone numbers, or personal addresses before forwarding a document to a third party.
Apple Preview tips and tricks for image editing: five practical capabilities
Preview's image tools aren't a Photoshop replacement, and they don't need to be. For the tasks most people actually face, stripping a background, converting formats, resizing for an upload form, signing a document, copying text from a screenshot, Preview is faster than opening a second app.
Tip 6: Remove an image background without additional software
Go to Tools → Remove Background or press Shift-Command-K. Preview analyzes the image and strips the background, per Digital Trends. Macworld lists background removal alongside color adjustments and granular resizing as part of the advanced Tools menu.
Gotcha: Results depend on contrast between subject and background. Clean separations work well; busy or gradient backgrounds may need manual refinement using the Lasso tool. Export the result as PNG to preserve the transparent background.
Tip 7: Convert image formats and resize to exact pixel dimensions
Go to File → Export and pick a format from the dropdown: HEIC, JPEG, PDF, PNG, TIFF, and others are available alongside quality controls, per Macworld. Before exporting, resize to a specific pixel dimension and resolution via Tools → Adjust Size.
Common scenario: an iPhone HEIC photo that needs to be a JPEG under 1MB for an upload form. Open in Preview, adjust size, export as JPEG at reduced quality. Hitting a precise file size target may take a couple of export attempts at varying quality settings.
Tip 8: Add a saved signature to any PDF or image
Open the Markup toolbar and click the Signature button. Draw your signature with the trackpad, or sign a piece of paper and hold it up to the camera. Preview stores the signature for reuse on any future document, as demonstrated in a 2024 YouTube walkthrough. Once stored, drag it into position and resize as needed.
This covers the most common use case: someone emails a PDF that needs a signature and a reply. For certificate-based or legally verifiable electronic signatures, a dedicated signing service is the appropriate choice.
Tip 9: Annotate PDFs and images with shapes, arrows, and text
The Markup toolbar provides arrows, circles, rectangles, text boxes, and freehand drawing. All elements are color-customizable and sit as a layer on top of existing content, as both Digital Trends and Macworld confirm.
That layered approach has a practical consequence: as Macworld notes, Preview limits you to adding new elements on top of existing content. For documents you'll need to revise, hold off on saving until annotations are final.
Tip 10: Copy text directly from an image or screenshot
Open an image containing text in Preview, whether a screenshot, a photographed document, or a scanned page. If the image contains printed text, in practice you can select it with your cursor and press Command-C to copy it, as demonstrated in a 2024 YouTube walkthrough. Pulling a quote, address, or phone number from a screenshot is faster than retyping.
Limitation: Works best on clear images with printed text. Handwritten content and low-resolution scans produce unreliable results. That's also different from OCR: Preview cannot make a scanned PDF searchable as a document, which is a distinct capability the app doesn't have.
Where Preview stops: four tasks that still need a dedicated tool
Knowing the limits before you hit them mid-task matters. Four specific jobs fall outside what Preview can do.
Edit existing PDF text. Preview can only add new elements on top of a PDF; it cannot modify text already in the document, as Macworld confirms. For that, Adobe Acrobat or PDF Expert are the appropriate choices.
Run OCR on scanned documents. Copying text from a standalone image works in practice. Scanned PDFs are a different matter. Preview cannot recognize text within them and make it searchable or selectable as document content.
Convert a PDF to a Word document. Export from Preview produces image formats and PDF variations. Word conversion isn't available, per SwifDoo.
Certificate-based electronic signatures. Preview's stored signatures are a practical convenience for everyday document handling. For contracts requiring legally verifiable e-signatures, a dedicated signing service is the right tool.
Use Preview for page cleanup, markup, signatures, quick image fixes, and file protection. Switch tools when you need true PDF text editing, OCR, Word export, or signing workflows that carry legal weight. Digital Trends notes that Preview's capabilities have expanded with recent macOS releases, with Sonoma adding AutoFill Form detection among other updates, so it's worth checking what the app can do after each upgrade before defaulting to a paid alternative.
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