How do I resize an image on Mac without Photoshop?

Three options: (1) Browser-based resizer — open in Safari, drop image, set dimensions, download. No install. (2) Preview (built-in) — open image, Tools > Adjust Size. (3) Automator — for batch resizing multiple images. The browser tool is fastest for quick resizing with no setup.

How do I resize images on Windows 10/11?

Three options: (1) Browser-based resizer — works in Chrome/Edge, no install. (2) Photos app (built-in) — open image, click resize. (3) PowerToys Image Resizer (free Microsoft tool) — right-click images to batch resize. The browser tool requires zero installation.

Can I batch resize multiple images?

Yes. Browser-based resizers support multiple files — drop them all at once, apply the same dimensions. On Mac, Automator can create a batch resize action. On Windows, PowerToys Image Resizer handles right-click batch resizing.

Does resizing affect image quality?

Downsizing (making smaller) preserves quality well. Upsizing (making larger) causes blur because new pixels must be invented. For the sharpest results when downsizing, use Lanczos resampling (most tools default to this or similar high-quality algorithms).

How do I resize to specific dimensions?

Enter the exact width and height in the resizer. Lock aspect ratio to maintain proportions (one dimension auto-calculates). Unlock to force exact dimensions (may stretch the image — crop first for better results).

What is the difference between resizing in Preview vs a browser tool?

Preview (Mac) has a simple resize dialog with width/height input. The browser tool offers the same functionality plus batch support, format conversion, and cross-platform compatibility. Preview is slightly faster for a single image. The browser tool is better for multiple images or when you also need to compress or change format.

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Resize Images on Mac, Windows, Desktop — Free, No Software

Last updated: April 6, 20265 min read By Carlos MendezImage Tools

You need to resize an image on your Mac or Windows PC — for a form upload, email, or website. You do not need Photoshop ($23/month). Here is how to do it for free on every platform.

Works on any desktop — Mac, Windows, Linux. Drop image, set dimensions, download.

Open Image Resizer

By Platform — Best Free Options

Platform	Quick Resize (1 image)	Batch Resize (10+ images)	No Install Option
Mac	Preview (built-in)	Automator workflow	✓ Browser resizer
Windows 10/11	Photos app (built-in)	PowerToys Image Resizer	✓ Browser resizer
Linux	GIMP or ImageMagick	ImageMagick CLI	✓ Browser resizer
Chromebook	Browser only	Browser only	✓ Browser resizer

Browser Tool — Works on Every Desktop

Open the image resizer in any browser
Drop your image (or multiple images)
Enter target dimensions (pixels)
Lock/unlock aspect ratio
Download resized image(s)

No install, no account, no upload to servers. Works on Mac, Windows, Linux, Chromebook.

Mac: Preview (Built-in)

Double-click the image to open in Preview
Tools → Adjust Size
Enter new width or height (lock "Scale proportionally")
Click OK → File → Save (or Export for format change)

Windows: Photos App (Built-in)

Right-click image → Open with → Photos
Click the three dots menu → Resize
Choose a preset or enter custom dimensions
Save

After Resizing — Common Next Steps

Compress: Reduce file size
Crop: Crop to aspect ratio
Convert format: JPG ↔ PNG ↔ WebP
Remove background: AI background remover
Add text: Text overlay on image

Resize images on any desktop — no Photoshop, no install, no upload.

Open Image Resizer

Carlos Mendez Photo Editing & Image Writer

Carlos has been a freelance photographer and photo editor for a decade, working with clients from local businesses to regional magazines. He writes about image tools from the perspective of someone who uses them professionally every day.

Resize Images on Mac, Windows, Desktop — Free, No Software

By Platform — Best Free Options

Browser Tool — Works on Every Desktop

Mac: Preview (Built-in)

Windows: Photos App (Built-in)

After Resizing — Common Next Steps

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