Step by step
- Drop the images into the box above.
- Type the width or height, or a percent.
- Click Resize and download the new files.
At a glance
| Situation | What to do | Why |
|---|---|---|
| Many images | Browser tool above | Batch, keeps originals |
| One image already open | Preview › Tools › Adjust Size | Built into macOS |
| Keep proportions | Tick Scale proportionally | Avoids stretching |
Where to find it on your device
- Preview: Tools › Adjust Size › Width/Height, Scale proportionally.
Related questions
Does Preview overwrite the original?
Preview saves changes to the same file. Use File › Duplicate first, or use the tool above, which downloads a new file.
Can Preview resize several images?
Yes: open them together, select all in the sidebar, then Tools › Adjust Size.
Are files uploaded?
No. Both Preview and the tool above work on your Mac.
More questions: resize image
- How to resize an image without losing quality
- How to resize an image without cropping it
- How to resize an image on iPhone without an app
- How to resize an image on Android without an app
- How to resize an image on Windows 10 or 11
- How to resize an image for Instagram (post and story sizes)
- How to resize an image for a WhatsApp profile picture
- How to resize an image for a YouTube banner and thumbnail
- How to resize an image for printing (cm, A4, photo sizes)
- How to resize an image to 20 KB, 50 KB or 100 KB
- How to resize an image in Canva (and a free alternative)
- How to resize an image in Photoshop (Image Size)
- How to resize an image in Paint
- How to resize an image in GIMP (Scale Image)
- How to resize an image in Google Docs and Word
- What is image resizing? Pixels, aspect ratio and DPI explained
Updated November 14, 2026.