Type the width or height you need and the tool works out the other dimension so the photo isn't distorted. You can also shrink it to 75, 50 or 25% in one tap and process several images at once.
Tap the box or drop in one or more photos. You'll see their current size in pixels.
Type the width or height in pixels. With “Lock aspect ratio” turned on, the other dimension adjusts by itself.
Pick an output format if you want to change it and download the resized image.
Reducing the pixels is the most effective way to make a photo's file smaller: at half the width and height, the file is roughly a quarter of the size. Enlarging, on the other hand, doesn't add detail: the image looks bigger but blurrier. If you need to upscale, don't go beyond twice the original size.
For emailing or uploading to a website, 1600 pixels on the long side is enough. For an avatar or profile picture, 400 to 800 pixels will do. For a good-quality print, figure on 300 pixels per inch (about 120 pixels per centimeter): a 4×6 in (10×15 cm) print needs 1200×1800 pixels.
Leave “Lock aspect ratio” turned on and change only the width or only the height. The other dimension is calculated automatically with the same proportions as the original photo.
Yes. Turn off “Lock aspect ratio” and type both dimensions. The image will stretch to fill them; if you'd rather crop than stretch, use the crop image tool.
About 300 pixels per inch, which is close to 120 pixels per centimeter. For a 4×6 in (10×15 cm) print you need 1200×1800 pixels, and for an A4 page, 2480×3508 pixels.
Yes, by a lot. File size depends mostly on the number of pixels: a photo reduced to 50% weighs around 25% of the original.
Yes. Load several images and choose a percentage or a width: it's applied to all of them and each one keeps its own aspect ratio.
No. The resizing happens in your browser and the photo doesn't leave your device.