Change dimensions
Set exact pixel dimensions or scale by percentage while optionally preserving the original aspect ratio.
JPG, PNG, WebP, or AVIF · up to 32 MB · adaptive 8–24 megapixel limit
Your image never leaves this browser
Images stay in browser memory and are never uploaded by these tools.
Decode and export JPG, PNG, WebP, and AVIF using browser and WebAssembly codecs.
Re-encoding can alter metadata, animation, profiles, or quality, so verify every output.
Complete tool guide
Change the width and height of an image in pixels, or scale it by a percentage. The aspect ratio stays locked by default so nothing looks stretched, and the output keeps the original format. Resizing to the size an image is actually displayed at is the most effective way to make it load faster and fit upload limits.
Your input is processed in the current browser tab and is not sent to the application server.
Choose or drag in one JPG, PNG, WebP, or AVIF image. Its current size appears under the file name.
Pick Pixels to enter a width and height, or Percentage to scale both sides together.
Keep Lock aspect ratio on to avoid stretching, or turn it off to set both values independently.
Select Resize image, check the new dimensions and file size, and download.
Enter the width and height of the output, from 1 to 10,000 px per side. With the aspect ratio locked, changing one side recalculates the other from the original proportions and rounds it to a whole pixel.
Scales both sides by the same amount, from 1% to 800%. The field shows the resulting size, such as “Output: 1500 × 1000 px”, before you resize.
On by default. Turning it off lets you enter any width and height, which stretches or squashes the image. To change the shape without distortion, crop to the new ratio first with the Image Cropper.
Start with: IMG_3301.jpg · 4032 × 3024 px (about 12.2 megapixels)
IMG_3301-resized.jpg · 1600 × 1200 px (1.92 megapixels)1600 × 3024 ÷ 4032 = 1200, so the 4:3 proportions are unchanged. The new image has 84.3% fewer pixels than the original, which is where most of the file-size saving comes from.
Start with: product.png · 3000 × 2000 px · transparent background
product-resized.png · 1500 × 1000 px · transparency keptHalf the width and half the height leaves one quarter of the pixels (1.5 MP instead of 6 MP). PNG stays lossless, so edges remain clean; convert to WebP afterwards if you need an even smaller file.
File size depends heavily on the number of pixels, which is width × height. Scaling a photo to half its width and half its height leaves a quarter of the pixels, and the file usually shrinks by a similar amount. Compress afterwards for further savings.
Sizes above 100% are allowed, but enlarging an image only spreads the existing pixels over a larger area. The result will look softer, and it cannot add real detail.
The output uses the same format as the input. JPG, WebP, and AVIF are saved at 82% quality; PNG stays lossless, and transparency is kept. The output must be no larger than 10,000 px per side and the megapixel limit of your device, typically 8–24 MP.
Keep Lock aspect ratio switched on and change only the width or the height. The other side is calculated from the original proportions.
If the image is not already square, crop it to 1:1 with the Image Cropper first, then resize it to 1080 px here. Unlocking the aspect ratio and typing both values would stretch it instead.
Yes, when you make the image smaller. Fewer pixels need less data, so the file shrinks roughly in proportion to the pixel count. Enlarging an image makes the file bigger.
No. This tool changes pixel dimensions, which is what screens and websites use. DPI is only a print setting that says how many pixels to fit in an inch; it does not change the image data.
No. A JPG stays a JPG and a PNG stays a PNG. Use the Image Converter to change the format.
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