How to Compress a JPG Without Losing Quality

JPG is a lossy format, which means every save throws away some data to make the file smaller. The goal is not zero loss, it is invisible loss: cutting the data your eyes cannot detect while keeping the detail they can. At sensible settings, a compressed photo looks identical to the original on a screen while taking up a fraction of the space.

The setting that controls this is the quality value, usually 0 to 100. Higher keeps more detail and a bigger file; lower saves more space but eventually shows artefacts, the faint halos and blocky patches around edges. The sweet spot for photos is roughly 75 to 85, where the savings are large and the loss is invisible.

Saving at 100 percent quality sounds safe but it is wasteful. A 100 percent JPG is several times larger than a 90 percent one for a difference almost nobody can see. Most images look perfect at 80 to 85, and photos with lots of texture, like grass or foliage, hide compression even better.

A simple rule: start at 80, look at the result at full size, and only nudge up if you spot something. For hero images and photography portfolios, 85 to 90 is a safe ceiling. For thumbnails and blog images, 70 to 75 is usually plenty.

Open a tool that lets you compress JPG files, drop your image in, and set the quality to around 80. Many tools also offer a target-size mode where you type a kilobyte goal, say 200 KB, and the tool finds the quality that hits it. Process the file and download the result. There is no software to install, and good tools delete your uploads automatically within a day.

Got a folder of images, or PNGs mixed in? Use a general compress image tool that batches several files at once and routes each format to the right compressor.

Two extra wins beyond the quality slider. First, strip the EXIF metadata: phone photos carry GPS coordinates, camera model and timestamps that bloat the file and leak private data. Removing it shaves a few kilobytes and protects your location.

Second, resize before you compress. A 6000-pixel-wide photo shown in a 1200-pixel column is wasting most of its pixels. Scaling the dimensions down to what the page actually uses cuts the file far more than compression alone, and the smaller image still looks sharp at its display size.

Open the compressed file at 100 percent zoom and compare it to the original. Look at edges, text and smooth gradients like skies, which is where artefacts show first. If it looks clean, you are done. If you see haloing or banding, bump the quality up five points and export again.

For the web, also consider saving a modern format like WebP or AVIF when your platform supports it, since both beat JPG on size at the same quality. But JPG stays the safest universal choice for email, marketplaces and anywhere compatibility matters most.