ImgResize is a small, single-purpose website: it resizes, crops and converts images — by pixels, percentage, longest side, social-media presets or a draggable crop box — entirely inside your browser.

Why this site exists

Most online image resizers share the same shape: an upload button, a spinner, and a server somewhere that processes your file and hands it back. That model has two problems. First, your image — maybe a passport photo, a client’s product shots, a picture of your kids — passes through infrastructure you can’t see. Second, server tools tend to be built around their quotas and their queue, not your deadline.

ImgResize is built the other way round. There is no upload because there’s nothing to upload to: decoding, resampling, cropping and re-encoding all run in JavaScript on your own device, which modern browsers are more than fast enough to do. Load the page, switch off your Wi-Fi, and it keeps working.

What the site covers

• The main resizer: resize by exact pixels, percentage or longest side, crop to a ratio with a draggable box, convert between JPEG, PNG and WebP — one file or a batch.
• Social media sizes: the dimensions each platform actually displays, plus one-click presets that crop-to-fill.
• Resampling explained: what nearest-neighbor, bilinear, bicubic and Lanczos do to your pixels — the difference between a crisp resize and a blurry one.
• When not to upscale: the cases where enlarging is the wrong tool, and what works instead.

How it’s built and maintained

The site is a static set of pages served from Cloudflare’s edge network — there is no image-processing backend to break or to leak from. The resizer is a few hundred lines of dependency-free JavaScript using createImageBitmap (so EXIF orientation is honored) and the canvas high-quality resampler. The guides are written by hand and checked against the platforms’ published dimensions.

ImgResize is maintained by a small independent team that builds focused utility sites. Something not working, or a platform size we got wrong? Contact us — correction reports get answered first.