Image Resizer
Drop images, choose a percentage or exact size, and download the resized copies. The original files stay untouched.
Add this calculator to your website
Copy the code and paste it into your page's HTML. It's free; please keep the credit link.
How it works
Resizing changes the number of pixels. For sharing and websites, 1080–1920 px on the longest side is plenty for most screens and keeps files small. When shrinking a lot, the browser smooths the image with high-quality resampling so text and edges stay clean.
Popular image sizes
| Use | Size (px) |
|---|---|
| Instagram square post | 1080 × 1080 |
| Instagram portrait post | 1080 × 1350 |
| Instagram / TikTok story | 1080 × 1920 |
| YouTube thumbnail | 1280 × 720 |
| Full HD wallpaper | 1920 × 1080 |
| 4K wallpaper | 3840 × 2160 |
Frequently asked questions
How do I resize without stretching?
Keep “Keep aspect ratio” ticked. The image fits inside the width and height you enter, so nothing gets distorted. Leave one box empty to set only that side.
Can I make an image bigger?
Yes, up to 1000%, but enlarging can't add detail, so the result will look softer.
Which format is used?
Each image keeps its format: JPG stays JPG, PNG stays PNG and WebP stays WebP. HEIC photos are saved as JPG.
Are my images uploaded?
No. The conversion runs entirely in your browser, so your photos never leave your device. You can even go offline after the page loads.