Image Compressor

Each preset combines an output format, a quality setting and sometimes a size reduction. Light re-encodes at 92% quality and full size — a small saving with no visible change. Balanced drops to 78%, which is the sweet spot for most web images.

Strong goes to 62% quality at 80% of the original dimensions, which typically halves the file again and suits images that only need to look right at small sizes. Maximum switches to WebP at 55% and 70% size, for when you need the smallest possible file.

The saving is shown as a percentage before you download, so you can step through the presets and stop at the point where the preview still looks acceptable to you.

Images are usually the largest thing on a web page by a wide margin, which makes them the biggest single lever on load time. Google measures loading with Largest Contentful Paint, and on most pages the largest element is an image.

The practical target for a full-width web image is under 200 KB, and under 100 KB for anything smaller. Photos straight from a phone are routinely 3 to 6 MB, so the gap is enormous — compression is usually the difference between a fast page and a slow one.

It matters off the web too: email attachment limits, upload caps on forms and portals, and storage on older devices.

JPG and WebP are lossy formats: detail is discarded to save space, and it cannot be recovered afterwards. Always keep the original file somewhere and compress a copy.

Repeatedly compressing an already-compressed image compounds the damage — this is what makes images passed through several apps look mushy. Compress once, from the original.

PNG is lossless, so a PNG compressed to JPG will lose detail permanently. That is usually a good trade for photographs and a bad one for screenshots with text, where JPG artefacts around letters are very visible.

No. Compression runs through the Canvas API in your browser. Nothing is sent to a server, stored or logged, and the tool works offline once loaded.