RapidHow to Crop an Image on Mac — 3 Free Methods
Crop any image on Mac using Preview, the Photos app, or a browser tool — all free, no Photoshop, works with JPEG and PNG.
How to crop an image on Mac requires no software download — Preview, built into every Mac, handles it perfectly. For non-destructive cropping with ratio presets, the Photos app is a good alternative. And for ratio presets such as 1:1 and 4:5 without Photoshop, a browser tool in Safari or Chrome covers it.
Method 1: Mac Preview (Fastest — Built Into macOS)
Preview is installed on every Mac and works with JPEG, PNG, TIFF, and most other image formats. No account or internet required.
- Double-click the image — Preview opens by default. If it opens in another app, right-click → Open With → Preview.
- Click the Markup Toolbar icon (the pencil-tip icon) in the toolbar, or go to View → Show Markup Toolbar.
- Click and drag over the area you want to keep. Hold Shift while dragging to constrain the selection to a perfect square.
- Go to Tools → Crop (or press Cmd+K). Everything outside the selection is removed.
- Press Cmd+S to save, or File → Export to save a copy in a different format without overwriting the original.
Method 2: Mac Photos App (Non-Destructive, Ratio Presets)
The Photos app is ideal when you want to crop a photo from your library and keep the original recoverable at any time.
- Open the Photos app and double-click the photo to open it.
- Click Edit (top-right corner).
- Click the Crop tool in the edit toolbar (overlapping rectangles icon).
- Click the aspect ratio dropdown on the right to choose a preset — Square, 4:3, 16:9, or others — or drag the handles freely.
- Drag to frame the subject, then click Done.
The crop is stored non-destructively. To revert: open the photo, click Edit → Revert to Original.
Method 3: Browser Tool — Ratio Presets, Including 4:5 (Safari or Chrome)
Neither Preview nor Photos lets you set an exact output size in pixels while cropping. The browser tool gives you ratio presets (Square 1:1, Portrait 4:5, 16:9 and more) and shows the selection size in pixels as you drag. It does not have a box to type an exact size, so for a precise size — 600×600 for a passport photo, 1080×1080 for Instagram — crop to the right ratio first, then set the exact pixels with Resize Image.
- Open Safari or Chrome on your Mac and go to rapidtools.online/crop-image.
- Click Upload and select your image.
- Pick a preset aspect ratio (such as Square 1:1 or Portrait 4:5), or use Free Form and drag the corners. The selection size is shown in pixels as you drag.
- Drag to position the crop area.
- Click Apply Crop, then Download Cropped Image — the file saves to your Downloads folder.
- Need an exact pixel size? Open Resize Image, upload the cropped image, and enter the width and height you need.
Method Comparison
| Method | Exact pixels? | Non-destructive? | Needs internet? | Best for |
|---|---|---|---|---|
| Preview | No (approximate) | No (overwrites) | No | Fast free-form crops |
| Photos app | No (ratio only) | Yes | No | Ratio presets, reversible |
| RapidTools crop | Shows the size as you drag (exact size: use Resize Image after) | Yes (original unchanged) | Yes | Ratio presets — Instagram 1:1 and 4:5 |
Common Crop Sizes
| Use case | Dimensions | Ratio |
|---|---|---|
| Instagram square post | 1080 × 1080 px | 1:1 |
| Profile photo (most platforms) | 400 × 400 px | 1:1 |
| US passport photo (digital) | 600 × 600 px | 1:1 |
| Standard photo print (4×6 in) | 1800 × 1200 px | 3:2 |
| YouTube thumbnail | 1280 × 720 px | 16:9 |
Frequently Asked Questions
How do I crop an image on Mac for free?
Use Preview — built into every Mac. Open the image, click the Markup Toolbar icon, drag a selection over the area to keep (hold Shift for a square), then go to Tools → Crop (Cmd+K). Press Cmd+S to save. No Photoshop, no download needed.
How do I crop to a square on Mac?
In Preview, hold Shift while dragging your selection to constrain it to a perfect square. Then Tools → Crop. For an exact pixel square (e.g. 1080×1080), crop with the Square (1:1) preset at rapidtools.online/crop-image, then set 1080 × 1080 with rapidtools.online/resize-image.
Will Preview overwrite my original image?
Yes — Cmd+S saves over the original. To keep both, use File → Export to save the cropped version as a new file. You can also duplicate the file first in Finder (select the file, press Cmd+D) then crop the duplicate.
What is the difference between Preview and Photos for cropping on Mac?
Preview works on any image file, gives free-form crop control, and is faster for one-off edits. The Photos app is non-destructive (keeps the original recoverable via Revert to Original), has ratio presets, but only works on photos already in your Photos library. For general use, Preview is usually the quicker option.
Can I crop to exact pixel dimensions on Mac without Photoshop?
Yes, in two steps. First crop to the right ratio at rapidtools.online/crop-image in Safari or Chrome (for a 600×600 passport photo, use the Square 1:1 preset). Then open rapidtools.online/resize-image and enter the exact width and height. Free, no account, no Photoshop.