Image Resizer

What is the image resizer?

An image resizer changes the pixel dimensions of a picture — making it smaller to fit an upload limit or load faster, or setting it to an exact size a platform requires. This tool resizes one image or a whole batch three ways: by pixels (type a width and/or height, with an optional aspect-ratio lock so the image doesn't stretch), by percentage (scale everything to 50%, 75% or any value), or by preset (one-click common sizes like Instagram post 1080×1080, Instagram story 1080×1920, a Facebook cover, a Twitter/X post or a YouTube thumbnail). It runs entirely in your browser using the canvas engine, so your images are never uploaded, and you can download results individually or as a single ZIP. Because it's client-side it's fast and private, with no watermark and no account.

How it works

Add images by dragging them in, choosing files, or pasting from the clipboard. Choose a resize mode. In pixel mode, enter a width and/or height; with the aspect-ratio lock on (the default), setting one dimension calculates the other automatically so nothing is distorted, and the tool scales each image to fit the box you specify. In percentage mode, a slider scales every image proportionally. In preset mode, pick a target from the dropdown and each image is scaled to fit that size while keeping its shape. A live readout shows the resulting dimensions before you commit. You can keep each image's original format or convert on the way out (JPG, PNG or WebP), with a quality slider for the lossy formats. Click Resize and the batch is processed with a progress bar; download the files one by one or as a ZIP. If a target size is much larger than the original, a notice warns you that enlarging can look soft — canvas upscaling stretches existing pixels rather than inventing new detail.

Worked example

You've got a folder of camera photos at 6000×4000 pixels and you want web-friendly 1200-pixel-wide versions. You add them all, choose pixel mode, type 1200 in the width field, and leave the aspect-ratio lock on — the height fills in automatically for each image based on its own shape. The preview shows 6000×4000 → 1200×800. You keep the format as JPG at 85% quality, click Resize all, and download a ZIP of correctly-proportioned, much lighter images. Later you need one of them as a perfect Instagram square, so you switch to preset mode, choose Instagram post 1080×1080, and resize just that image.