Image Resizer

How to resize an image

1. Drop your image into the tool or click to select it.
2. Type your target width or height in pixels, or choose a percentage scale.
3. Keep the aspect-ratio lock on to avoid distortion, or unlock it for exact dimensions.
4. Click Resize and preview the result.
5. Download the resized image to your device.

Enlarging vs shrinking

Shrinking an image is safe: detail is condensed and the result stays crisp. Enlarging is different. A resizer cannot invent detail that was never captured, so scaling a 500 px image up to 2000 px will look soft. When you need both a large and a small version, always start from the biggest original you have.

For screens, you rarely need more than 2000 px on the long edge. For printing, aim for roughly 300 pixels per inch of printed size, so a 6×4 inch print wants about 1800×1200 pixels.

Dimensions, file size and DPI are not the same thing

Resizing changes how many pixels an image contains — its width and height. That usually changes the file size too, since fewer pixels means fewer bytes, but the two aren't the same setting. If you specifically need a smaller file at the same dimensions, compress the image instead of resizing it.

DPI (dots per inch) is a third, separate number that only matters for printing. It tells a printer how densely to lay the existing pixels on paper; it doesn't add or remove any. A 1800×1200 image prints crisply at 6×4 inches whatever DPI tag it carries, because DPI equals pixels divided by print size. For screens, DPI is irrelevant — only the pixel dimensions count.

How resizing happens in your browser

The tool draws your image onto an HTML Canvas at the new dimensions, letting the browser's built-in resampling smoothly average pixels together when shrinking, or interpolate between them when enlarging. This is the same high-quality scaling the browser uses to display responsive images, so results are clean without any plugin.

All of it runs locally in JavaScript on your device. There is no upload and no waiting behind other users. Even very large camera files resize in a moment on a modern machine, and the original on your disk is never touched — you're always working on a copy.

The photo never leaves your device

Resizing here is completely local, so your image is never sent to a server. That's what makes it safe to resize a scanned ID for a visa form, a medical document, or a photo you haven't published yet — none of it is ever exposed to anyone.

Typical online resizers upload the file, resize it in the cloud and return it, leaving a copy on their infrastructure. This tool reads the picture directly in the browser and processes it there. You can verify that no upload happens using your browser's developer tools.

Fixing common resize problems

A blurry result almost always means you enlarged past the detail the original held. There's no fix except starting from a bigger source, because no tool can restore information that was never captured. When you need several sizes, always downscale from the largest original rather than scaling a small one up.

A stretched or squashed look means the aspect-ratio lock was off while you entered mismatched width and height. Turn the lock on and set only one dimension; the other follows automatically. If a platform demands an exact shape your photo isn't, crop it to that shape first, then resize.

Resize, crop or compress — which one you need

These three jobs get confused constantly. Resizing keeps the whole picture but changes its pixel dimensions. Cropping keeps the resolution of what stays but throws away everything outside a box, changing the shape. Compressing keeps both the picture and its dimensions but shrinks the file by lowering quality.

They combine well in order: crop to get the right shape and framing, resize to hit the exact pixel dimensions a platform wants, then compress to slip under a file-size cap. Doing them in that sequence gives the smallest, best-looking result.

Target sizes worth knowing

A few dimensions come up again and again. Square avatars and grid posts sit comfortably at 1080×1080. YouTube thumbnails are 1280×720, and most video and slide covers follow the same 16:9 shape at larger sizes. Portrait social posts display fullest at 1080×1350, a 4:5 ratio.

For the open web, 1600–2000 pixels on the long edge is plenty for a full-width image; anything larger just wastes bandwidth. For print, multiply the printed size by about 300: a 6×4 inch photo wants roughly 1800×1200, and an A4 page around 2480×3508.

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