Image Compressor - Reduce JPG, PNG & WEBP Size

Image Compressor

This image compressor reduces the file size of JPG, PNG, and WEBP images directly in your browser. The file is never sent to a server: compression runs locally, and you control the result with a single quality slider.

How the compression works

The tool re-encodes the image at the quality level you choose, from 10 percent (smallest file, most visible artifacts) to 100 percent (largest file, closest to the original). If the image is wider or taller than 4096 pixels, it is scaled down proportionally before compression, since dimensions above that rarely help on the web and only add weight. The work happens in a background thread, so the browser stays responsive while a large photo is processed.

Worked example

A 4000 by 3000 pixel JPEG straight from a phone camera, 4.8 MB, compressed at the default 80 percent quality typically lands between 700 KB and 1 MB, a reduction of roughly 79 to 85 percent. Drop the slider to 40 percent and the same file can fall below 300 KB, though fine detail in skin tones and gradients starts to blur. A 1200 by 800 PNG screenshot with flat colors behaves differently: at 80 percent it often loses only 10 to 20 percent, because PNG already removes most of the redundancy that a JPEG-style quality setting targets. A 6000 by 4000 pixel JPEG exported from a photo editor is wider than the 4096-pixel limit, so it is resized to 4096 by 2731 before the quality setting is applied; the combination of the resize and an 80 percent quality typically takes a 7 MB original under 1.2 MB.

The result panel shows the original size and the new size next to each other, plus the percentage saved, so the effect of moving the slider is visible before you download. The downloaded file keeps the original name with a "compressed-" prefix, which makes it easy to tell it apart from the source image.

Quality settings and when to use them

There is no single correct value. These ranges are a starting point based on typical output at each setting.