Resize images in bulk

Why there is no file limit here

Almost every online bulk resizer caps a free tier somewhere between twenty and fifty images, and the reason is always the same: each file costs them processing time on a machine they are paying for, so the cap is how the free tier stops being expensive. There is no such machine in this arrangement. The resizing happens on your own processor, in this tab, so there is nothing to meter and nobody to charge.

The practical ceiling is your device's memory rather than a number somebody chose. A laptop handles several hundred phone photos comfortably; an older phone will manage rather fewer. If a batch is genuinely enormous, splitting it in two costs nothing.

It runs on every core you have

Images are processed in parallel, one worker per processor core, with a core kept free so the page stays responsive while it works. That is why a large folder finishes in a minute or two rather than crawling — and it is a thing a server-based tool cannot match for you, because on the other end you are sharing a queue with everybody else who arrived at the same time.

Mixed sizes and shapes are the normal case

A real folder is never uniform: portrait and landscape, phone photos and screenshots, some already small. Setting only a width handles all of it — every image is scaled to that width and keeps its own proportions, and nothing is enlarged past its original size unless you ask.

Where you need exact dimensions for every file, set both and choose whether images are fitted inside that box or cropped to fill it. A crop is stored as a proportion rather than a pixel rectangle, so it falls in the same relative place on a 4000-pixel photo and a 800-pixel one.

The reason this matters for a folder

Uploading one photo to a website is a small decision. Uploading four hundred is a different one entirely — that is a whole holiday, a client shoot, a property listing or a year of receipts, handed to a machine you know nothing about, usually to make them narrower. Doing it locally removes the question rather than answering it.