Image Resizer
image-resize• Resize images by pixels or percent and shrink the file size. • Runs in your browser with no upload. Shows how much smaller it got.
You can also paste a screenshot with Ctrl + V
Your image is processed in the browser only. It is never uploaded to a server.
How to resize an image and shrink its file size
Drop an image or click to choose one to get started, or paste a screenshot with Ctrl+V. There are three ways to set the size. Pixels lets you type the width and height directly. Percent scales the image to a share of the original with a slider. Long edge lets you cap the longer of the two sides and the other follows the ratio, which is handy when you want portrait and landscape photos normalised to one standard.
File size has two handles: dimensions and quality. Halving the width and height cuts the pixel count to a quarter, which drops the size a lot on its own. Quality only applies to JPG and WEBP; for photos, 70 to 85 is usually indistinguishable by eye while saving a lot of bytes. Under the preview you can see exactly how far the file size fell from the original, so try a few values and watch the number.
You can save as JPG, PNG or WEBP. JPG is the safe default for photos, while PNG is what you want for logos and icons that need a transparent background. WEBP is the lightest at the same quality, though very old software may not open it. Enlarging beyond the original is allowed but will look soft, since the missing detail cannot be invented. Everything runs inside your browser and the image is never sent to a server.
Frequently asked questions
How much smaller does an image get if I halve its dimensions?
Halving both the width and the height leaves a quarter of the pixels, and the file size drops by roughly the same amount. It is a quarter, not a half, which surprises most people. Set Percent mode to 50 and watch the reduction figure under the preview. If that is not enough, lower the quality too. Lower the quality on top of that and files often land under a tenth of the original.
What size should I use for email attachments or messaging apps?
Long edge at 1920 still looks sharp on any screen while cutting the file size a lot. For documents or chat, 1280 or even 800 is usually plenty. Long edge never enlarges: a photo already smaller than the value you set is left untouched, which makes it easy to normalise a whole batch to one standard.
I lowered the quality slider but the file size did not change.
Quality only applies to JPG and WEBP. When the format is PNG the slider does not appear at all, because PNG is lossless and has no quality dial. PNG is heavy for photographs. Unless you specifically need transparency, switch to JPG or WEBP and set the quality between 70 and 85.
Why does enlarging a small image make it blurry?
The extra pixels do not exist in the original, so they are filled in by blending neighbouring colours. Nothing is added, the same detail is just stretched over more pixels, and edges smear. That is why Long edge mode refuses to upscale, and why a warning appears when Pixels or Percent goes past the original size. If you truly need a bigger image, tracking down the original file is faster.
How do I keep the aspect ratio from distorting?
In Pixels mode, leave Keep aspect ratio checked and typing one side fills in the other automatically. Unchecking it lets you set width and height independently, but faces and text will look stretched. Percent and Long edge always preserve the original proportions, so use those when you are unsure. The figure next to the preview shows the final pixel dimensions.
Can I resize several images at once?
The tool handles one image at a time. In exchange nothing is uploaded and there is no waiting for a transfer, because the whole job runs inside your browser. It opens PNG, JPG, GIF, WEBP and SVG files up to 20MB, and pasting a screenshot with Ctrl+V starts the resize immediately.