Resize Image

Drop or paste one or more images onto the tool and it redraws them at your chosen size entirely in your browser using the HTML5 Canvas API. Pick a mode — percentage scale, exact pixel dimensions, or "fit within" a maximum size — optionally choose an output format (original, JPEG, WebP, or PNG) and quality, and the tool shows a live before/after preview with the exact new dimensions before you download. Resizing is performed locally on your device, so your images are never uploaded anywhere.

Yes — 100% private. All resizing runs in your browser with JavaScript, so screenshots, documents, or personal photos never leave your computer. There is no server, no upload, and no data collection. The tool also works offline after the page has loaded.

Percentage scaling multiplies both dimensions by the same factor — 50% halves the width and height, 200% doubles them — which always preserves the aspect ratio. Exact pixels lets you target a specific width and height, like 1920×1080 or 800×600. With the "Keep aspect ratio" option enabled, the image is scaled to fit inside your requested box so it is never stretched (it enlarges too if your box is larger than the original); with it disabled, the image is stretched to exactly the dimensions you typed.

"Fit within" shrinks an image so it fits inside a maximum width and height box while keeping its aspect ratio — and never enlarges it. For example, "Fit within 1920×1080" turns a 4000×3000 photo into a 1440×1080 image (or whatever fits), which is perfect for preparing photos for the web, social media, or email without having to calculate the correct numbers yourself.

Usually, yes — and dramatically. File size scales roughly with the number of pixels, so halving both dimensions (25% of the pixels) typically cuts the file by 60–80%. A 4000×3000 smartphone photo is far more than most websites need; a 1920px-wide version loads much faster with no visible difference on screen. One exception: if you resize upward (enlarging), the file will get bigger, and the tool's savings badge turns orange so you can spot it immediately.

Yes. The percentage mode goes up to 400%, so you can double or quadruple an image's size. Just be aware that enlarging cannot create new detail — the browser scales the existing pixels up, so the result may look soft or slightly blurry when viewed at 100%. For the sharpest results, start from the largest original you have and only scale down, or use vector formats for designs that need to be infinitely resizable.

An aspect ratio is the proportional relationship between width and height, written like 16:9 (widescreen) or 4:3 (classic photo). When you resize an image and the ratio changes, the image looks stretched or squashed. The "Keep aspect ratio" option in Pixels mode preserves the ratio by fitting the image inside your target box instead of forcing both dimensions — that's why it's on by default. The tool even shows you the resulting ratio (for example 16:9) live as you type.

If you only need to change the size, choose "Original" to keep the same format. If you also want a smaller file, JPEG or WebP at quality 70–90% are great for photos, with WebP usually winning on size while supporting transparency. Use PNG for logos, icons, and screenshots where pixel-perfect detail matters. Since resizing re-encodes the image anyway, this is a convenient moment to convert formats if you need to.