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Quick answer
To resize an image, open Zappy Resize Image, add a JPG, PNG or WebP, then choose Pixels (for screens), Inches (for printing) or File size (to fit an upload limit). Pick a preset or enter your own size and click Resize image. It runs in your browser, so the photo is never uploaded.
How to resize an image in 3 steps
Add your image
Open Resize Image and drop in a JPG, PNG or WebP up to 25 MB.
Choose how to resize
Use Pixels for exact dimensions, Inches with a DPI for printing, or File size to keep the dimensions and shrink the file.
Resize and download
Click Resize image. The new size is shown and the image downloads straight away.
Common image sizes
Swipe to compare →
| Use | Size in pixels | Zappy preset |
|---|---|---|
| US passport photo | 600 × 600 | US Passport |
| Instagram post (square) | 1080 × 1080 | Instagram post |
| LinkedIn profile photo | 400 × 400 | LinkedIn photo |
| HD / YouTube thumbnail | 1280 × 720 | HD |
| Full HD wallpaper or slide | 1920 × 1080 | Full HD |
How to resize without losing quality
- Make images smaller, not bigger. Shrinking keeps a photo sharp. Enlarging a small image adds pixels that were never there, so it gets soft.
- Keep the aspect ratio so faces and products don't look stretched.
- Use PNG for screenshots, logos and text. Use JPG for photos, where it gives a much smaller file.
- Start from the original, not a copy that has already been shrunk or sent through a chat app.
How to resize an image for printing
For print, size matters in inches, not pixels. Choose Inches, enter the print size, and pick a DPI: 300 DPI for photo prints, 150 DPI for everyday printing. A 4 × 6 inch photo at 300 DPI needs 1200 × 1800 pixels.
How to resize an image on iPhone
The Photos app can crop to a shape (tap Edit, then the crop tool and an aspect ratio such as Square), but it cannot set an exact pixel size. For exact dimensions, open Resize Image in Safari and pick the photo from your camera roll.
How to resize an image on a Mac or Windows PC
Mac: open the image in Preview, choose Tools > Adjust Size, enter the width or height with Scale proportionally checked, then save.
Windows: open the image in Paint, click Resize, choose Pixels, keep Maintain aspect ratio checked and enter the new width. In the Windows 11 Photos app, use … > Resize image.
Frequently asked questions
How do I resize an image for free?
Open Zappy Resize Image, add your photo, choose pixels, inches or file size, set the new size and click Resize image.
How do I resize an image without losing quality?
Make images smaller rather than larger, keep the aspect ratio, and start from the original file. Use PNG for text and logos and JPG for photos.
What size is a US passport photo in pixels?
600 by 600 pixels is the standard digital size. Zappy Resize Image has a US Passport preset.
How do I resize an image on iPhone?
Photos can crop to a shape but not to exact pixels. Use Resize Image in Safari to set an exact size.
How do I resize an image on a Mac?
Open it in Preview, choose Tools, Adjust Size, enter the new width or height, keep Scale proportionally checked and save.
What size should an Instagram post be?
1080 by 1080 pixels for a square post. Zappy Resize Image has an Instagram post preset.
Is my photo uploaded?
No. Resize Image works inside your browser, so the photo stays on your device.