Quick Look is one of the most useful Mac features almost nobody uses to the fullest. Select any file in Finder, tap the spacebar, and a full preview pops open instantly — no app to launch, no waiting. It works on photos, PDFs, videos, audio, text, ZIP archives, code, and dozens of other formats. This guide covers everything Quick Look can do in 2026, from the one-tap basics to the hidden Markup, trim, and rotate tools built right into the preview window.
The one-tap basics: preview any file with the spacebar
Open a Finder window, click once on a file to select it (do not double-click), and press the spacebar. A preview window opens showing the file at a readable size. Press the spacebar again — or the Esc key — to close it. That is the entire core feature, and it is the fastest way to check what is inside a file without opening it.
A few things that make it even faster:
- Arrow through files: With Quick Look open, press the Left and Right arrow keys to preview the next or previous file in the folder without closing the window.
- Preview several at once: Select multiple files (Command-click or Shift-click), tap the spacebar, and use the arrows or the grid button in the top-left to flip through all of them as a slideshow.
- Full screen: Hold Option and press the spacebar to open Quick Look in full-screen mode — great for photos and PDFs.
- Works almost everywhere: Quick Look also works on files in Spotlight results, Mail attachments, Messages, and the Open/Save dialog — anywhere you can select a file.
Rotate, trim, and sign — the hidden tools inside the preview
The Quick Look window is not just a viewer. Depending on the file type, a small toolbar appears at the top with editing tools you can use without ever opening a full app:
- Photos: A Markup button (the pen-tip icon) lets you crop, rotate, draw, add text, and highlight — then click Done to save the changes back to the file.
- PDFs: The same Markup tools appear, so you can annotate, highlight, and add your signature directly in the preview. For heavier PDF work — merging, compressing, reordering pages — see our guide on using Preview to edit PDFs.
- Video and audio: Quick Look gives you a play button and a Trim control — drag the yellow handles to cut a clip and click Trim to save a shorter copy, no video editor required.
- Sign a document: In the Markup toolbar, click the signature icon to add a saved signature (or create one with your trackpad or Mac camera) — perfect for signing a PDF and sending it straight back.
What file types does Quick Look support?
Out of the box, Quick Look previews images (JPEG, PNG, HEIC, GIF, RAW), PDFs, plain text and rich text, Pages/Numbers/Keynote and Microsoft Office documents, most video and audio formats, ZIP archive contents, fonts, and even source-code files with syntax coloring. If you install extra apps, some add their own Quick Look plug-ins — for example, developer tools can add previews for extra code and data formats. If a file will not preview, it usually means no plug-in exists for that specific format.
Quick Look vs. opening the file
Opening a file launches its full app, which is slower and clutters your Dock and window list. Quick Look is designed for the moment you just need to see what a file is — which photo is which, whether a PDF is the right version, what a screen recording captured — before deciding to open, rename, delete, or send it. Pair it with Spotlight search and you can find and preview any file in seconds without touching Finder at all.
Quick Look on an older or used Mac
Quick Look has been built into macOS for years, so it works the same on a brand-new MacBook and on a clean, tested used one — it is a software feature, not a hardware one. If you are shopping for a Mac that runs every modern macOS feature smoothly without paying new-Apple prices, our Apple clearance lineup starts at just $450 for a MacBook Air, each one inspected and backed by a one-year warranty. Want a bigger screen for previewing photos and PDFs? A 15-inch MacBook Air gives you more room for the same Quick Look tricks.
Frequently asked questions
How do I open Quick Look on a Mac?
Select a file in Finder with a single click, then press the spacebar. Press the spacebar or Esc again to close the preview.
Why is the spacebar not previewing my file?
Make sure you single-clicked the file to select it (not double-clicked, which opens it) and that a Finder or desktop item is actually highlighted. Some rare file formats have no Quick Look plug-in and will not preview.
Can I edit a file in Quick Look?
Yes — for photos and PDFs the Markup toolbar lets you crop, rotate, annotate, and sign, and for video and audio you can trim clips. Click Done to save changes back to the file.
Does Quick Look work on a used or refurbished MacBook?
Absolutely. Quick Look is part of macOS, so it works identically on a used Mac. Every Mac we sell is tested and runs the latest macOS features.