Image resizer
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Resize JPEG and PNG images by exact pixels or percentage, keep the aspect ratio, and download the result locally.
new dimensions, same photo, zero uploads.
work surface
Math, not advice — results are indicative.Read the disclaimer.
most-used utilities
A half-size photo
Open the image, press 50%, and download the JPEG.
A social card
Set the long edge to 1200 px and keep the ratio locked.
A tiny thumbnail
Use 25% or type the exact square size you need.
pro tips
Lock the aspect ratio unless you actually want a crop-shaped distortion.
Resize down in one step rather than several; repeated resampling softens the image.
For screens, 2x the display size is enough for a crisp result on most devices.
what it does
Pick an image, type the width or height you need, and the other side follows when the aspect ratio is locked. Percentage buttons handle the common "half size" and "quarter size" cases without arithmetic.
Resizing is the first thing to try when a file is too large or a layout needs a specific dimension. It is also the honest way to make an image fit a container instead of letting CSS stretch it and hope for the best.
A 4,000 × 3,000 photo at 50% becomes 2,000 × 1,500. At 25% it becomes 1,000 × 750, which is plenty for a card or a thumbnail. Upscaling works too, but the pixels are stretched, not invented, so it will look softer.
The preview updates as you type, and the download uses the format you choose. JPEG gets a white background for transparency; PNG keeps its alpha.
quick answers
Does resizing reduce file size?
Usually yes, because fewer pixels mean less data to encode. The exact result depends on the format and how much detail the image has.
Can I resize without distorting the image?
Yes. Keep the aspect ratio locked and change only one dimension; the other follows automatically.
What happens if I upscale?
The image gets larger but not sharper. The browser stretches the existing pixels, so fine detail may look soft or blocky.