How to resize images
- Drop one or more images onto the upload area. JPG, PNG, WebP and HEIC files are supported, and you can resize a whole batch at once.
- Choose Resize by: Width (px), Height (px) or Percentage.
- Enter the Value, for example
1200for a 1200-pixel-wide image or50for half size. - Pick the Output format (JPG, PNG or WebP) and, for JPG and WebP, the Quality.
- Click Resize images and download the results.
Resizing is done in your browser, so the images never leave your device and are not stored anywhere.
Width, height or percentage?
The aspect ratio is always preserved, so you only set one dimension and the other is calculated automatically. This avoids stretched or squashed pictures.
| Resize by | Best when |
|---|---|
| Width | Images go into a web page, blog or shop with a fixed content width |
| Height | Images need to line up in a row, such as product thumbnails or a banner strip |
| Percentage | A batch of mixed sizes should all be reduced by the same amount, e.g. 50% |
Common target sizes
- Website hero or full-width image: 1600–2400 px wide.
- Blog or article image: 1000–1400 px wide.
- Email attachment or chat: around 1280 px on the long side keeps photos sharp and light.
- Thumbnails: 200–400 px.
For high-density (Retina) screens, use roughly twice the width at which the image is displayed.
Why resizing matters
Modern phones capture photos 4000 pixels wide or more. Displayed on a web page at 1000 pixels, such an image downloads around sixteen times as many pixels as needed, slowing page loads and hurting Core Web Vitals scores. Resizing to the size you actually display is usually the single most effective way to reduce image weight, and many upload forms reject images above a certain size or resolution.
Tips and limitations
- Avoid enlarging. Scaling an image above its original size makes it bigger but not sharper; the browser can only interpolate the missing detail.
- Keep transparency by choosing PNG or WebP. JPG has no transparency, so transparent areas become white.
- HEIC photos from iPhones are decoded in the browser and saved in the format you choose, which can take a moment for large batches.
- For the smallest files after resizing, run the results through Compress Image or convert them to WebP.
Frequently asked questions
Will my images be distorted?
No. You set one dimension or a percentage and the aspect ratio is kept automatically.
Can I resize many images at once?
Yes. Select or drop as many images as you like and they are all resized with the same settings.
Does resizing reduce quality?
Making an image smaller removes pixels, but at the displayed size it looks just as sharp. Output quality for JPG and WebP is controlled by the Quality slider.