Resize images without uploading them

Type the width and height you need into the dimension fields. In Fit inside the image keeps its aspect ratio and nothing is cropped — you get the largest image that fits your box. In Crop to fill you get exactly the size you typed: the image fills the box completely and the overflow is trimmed from the edges, centred.

Find out what the limit actually is first. Many forms measure the file in megabytes, and several measure the pixel dimensions instead — the form will say so in its error message. If it is a pixel limit, this is the right page: set a width or height below it and the image is made smaller. If it is a size limit, you need fewer bytes per pixel, which is the image compressor. A single action usually does both, because cutting the pixel count in half cuts the file to roughly a quarter.

Use Fit inside rather than Crop to fill. Fit inside shrinks the whole frame until it fits your box, keeps the aspect ratio exact and trims nothing, so every pixel of the scene is still there in a smaller image. Crop to fill hits the dimensions you typed exactly, but it trims the overflowing edges — which is what you want for a square avatar and what you do not want for a photograph. Rotation and crop both run before the resize, so what you see in the preview is what ends up in the file.

For a web page, 1200 px on the long edge is enough for a full-width photo on a desktop screen; 1600–2000 px is worth it only if viewers will zoom. For an email attachment, aim under about 1 MB per image, which at JPEG quality is roughly 1600 px on the long edge — mail servers bounce larger attachments more often than readers notice the resolution. The Common targets list further down this page has the exact conventional sizes for documents, avatars and listings. Set the width, choose fit-inside, and the pixel dimensions you get are the ones the file actually uses.

Yes, close to the square of the change — halving each side of an image makes the file about a quarter of its previous size. Shrinking the pixels and re-encoding the same picture into a leaner format are two separate levers, though, and this page only pulls the first one. If you need a specific file size — an upload cap in KB, an email limit — set the dimensions here and then switch Strategy to Target size, or drop the picture into the image compressor. Squeezing bytes out of a full-resolution picture rarely buys you anything, because encoded detail is exactly what makes a file big.

Fit-inside preserves every pixel of the scene and may deliver a different aspect ratio than you asked for. Crop-to-fill delivers the exact dimensions by trimming the edges that overflow — the framing changes, the pixels do not stretch. Use fit-inside when nothing may be lost; use crop-to-fill when the exact size matters more than the edges, such as square avatars or fixed-dimension form uploads.

Yes. The Rotate & flip section turns every image by 90°, 180° or 270° and mirrors it horizontally or vertically — in any combination. Rotation is applied first and the flip mirrors what you see afterwards, and both run before the resize so the fit is computed against the oriented image. Like everything else on this site, it happens entirely in your browser.

Yes. The Crop to a ratio section trims every image to 1:1, 4:3, 3:2 or 16:9 — always the largest rectangle that fits, with a nine-way anchor for keeping the centre, an edge, or a corner. Cropping runs before the resize, so the target size is computed against the cropped frame, and images that already match the chosen ratio are passed through untouched. It all happens in your browser.

Yes. Select any number of files, or drag a multi-selection onto the page. The same setting applies to every image, they process in parallel background workers, and Download all packages the finished files into a single ZIP. Percent mode scales each image by the same factor, so mixed sizes keep their relative proportions.

Downscaling permanently discards pixels — that is what making an image smaller means — but the resampler works in repeated halving steps with high-quality smoothing to avoid aliasing, and an unsharp mask runs automatically after a strong reduction so edges stay crisp. Upscaling stretches existing pixels; no tool can invent detail that was never captured, and this one doesn't pretend to.

Yes. Set the dimensions, then switch Strategy to Target size and enter the budget — for example 1080×1080 under 200 KB. The engine resizes first, then searches encoder quality until the file fits, which is what marketplace and form uploads usually need.

Your files are only ever read by your own browser. There is no server-side component that accepts image data. The only network requests the page makes are for the site's own assets and, optionally, the WASM codec modules from a public CDN — never your images.

Yes. Once the page has loaded, resizing runs entirely on your machine. Blocking the CDN only means the optional WASM codecs are unavailable; the built-in browser encoders take over automatically and everything else is identical.