Blog/How to Crop an Image on Mac (4 Free Methods — No App Needed)

How to Crop an Image on Mac

You need to crop a photo on your Mac — maybe for a profile picture, a product listing, or a social media post. The good news: macOS has built-in cropping in two apps you already have, plus a browser-based option if you need more control.

Here are four free methods, ranked by speed.

Method 1: Preview (Fastest — Built Into Every Mac)

Preview is macOS's default image viewer, and it has a hidden cropping tool most people never find.

Steps:

1. Double-click your image — it opens in Preview by default
2. Click the Markup toolbar button (pencil icon in the top bar, or press Shift + Cmd + A)
3. Click the Selection dropdown and choose Rectangle Selection
4. Drag to select the area you want to keep
5. Go to Tools → Crop (or press Cmd + K)
6. Save with Cmd + S

When to use Preview:

• You need a quick crop with exact pixel control
• You want to crop to a specific aspect ratio (hold Shift while dragging for a fixed ratio)
• You're already looking at the image

Limitations:

• No presets for Instagram, LinkedIn, or passport sizes
• No way to enter exact dimensions (e.g., "make this 1080×1080")
• Can't export to WebP

Method 2: Photos App (Best for iPhone Photos)

If your photos are in iCloud, the Photos app is the easiest option.

Steps:

1. Open Photos from your Dock or Applications
2. Double-click the photo you want to crop
3. Click Edit in the top-right corner
4. Click the Crop tab
5. Drag the corners of the crop box to resize
6. Use the aspect ratio lock (chain icon) to constrain to a ratio like 1:1, 16:9, or 4:3
7. Click Done

When to use Photos:

• Your photos are synced from iPhone via iCloud
• You want built-in aspect ratio presets
• You're editing multiple photos in a batch

Limitations:

• Preset ratios only — can't enter custom pixel dimensions
• No social media-specific presets
• Edits are non-destructive but stay in Photos (you need to export the cropped version)

Method 3: Browser-Based Tool (Best for Precise Sizes)

When you need an exact size — 1080×1080 for Instagram, 360×360 for LinkedIn, 2×2 inches for a passport — a browser-based cropper is more precise than Preview or Photos.

Steps:

1. Open ImageCropKit in Safari or Chrome
2. Drag your image onto the page (it stays on your Mac — nothing uploads)
3. Choose a preset (Instagram, LinkedIn, passport, etc.) or enter custom dimensions
4. Adjust the crop area by dragging
5. Click Export to download the cropped image

When to use a browser tool:

• You need an exact pixel size (e.g., 1080×1080 for Instagram)
• You want social media presets without memorizing dimensions
• You need to crop multiple images at once (bulk crop)
• You want WebP export for smaller file sizes

Why it's safe:

Everything happens in your browser. Your photos never leave your Mac. No account, no upload, no watermark.

Method 4: Terminal (For Power Users)

If you're comfortable with the command line, sips (Scriptable Image Processing System) can crop images without opening any app.

Basic crop:

sips --cropToHeightWidth 1080 1080 photo.jpg --out cropped.jpg

Crop a specific region:

sips --cropOffset 100 200 500 500 photo.jpg --out cropped.jpg

The four numbers are: leftOffset topOffset cropWidth cropHeight in pixels.

When to use sips:

• You're scripting batch crops
• You need to automate image processing
• You're cropping 100+ images with the same dimensions

Limitations:

• No visual preview — you're flying blind
• Coordinates are in pixels, so you need to know the exact numbers
• No WebP support

Which Method Should You Use?

Common Cropping Sizes for Mac Users

Tips for Better Crops on Mac

Don't crop too tight

Leave a small margin around your subject. A headshot cropped right at the hairline looks cramped. A product photo cropped to the edge of the box loses context.

Use the rule of thirds

Most crop tools (including Preview) can show a 3×3 grid. Place the subject at one of the intersection points for a more natural composition.

Check the output size

After cropping, verify the pixel dimensions. Preview shows this in Tools → Adjust Size. If you need 1080×1080 and you got 1078×1082, re-crop.

Save a copy, not the original

Preview overwrites the original when you save. Use File → Export (or Cmd + Shift + S) to save a copy instead.

Frequently Asked Questions

How do I crop a screenshot on Mac?

Open the screenshot in Preview (double-click it), then follow the Preview method above. Alternatively, use Cmd + Shift + 4 to take a screenshot of just the area you need — no cropping required.

How do I crop an image to a circle on Mac?

Preview and Photos only support rectangular crops. For a circle crop, use a browser-based tool like ImageCropKit's circle crop feature.

How do I crop an image to exact dimensions on Mac?

Preview doesn't support entering exact pixel dimensions. Use a browser tool: enter your target width and height, and the crop box locks to that ratio.

Can I crop a PDF on Mac?

Yes — Preview can crop PDFs too. Open the PDF, use the rectangle selection tool, then Tools → Crop. The same keyboard shortcuts work.

How do I crop multiple images at once on Mac?

Use Terminal with sips for batch processing, or use a browser tool with bulk crop support. Preview and Photos don't have batch crop.