Image Compressor

Image Compressor reduces the file size of your photos and graphics by re-encoding them with an adjustable quality level and, optionally, a more efficient modern format. Smaller files load faster on websites, consume less storage, attach more easily to email, and improve Core Web Vitals scores like Largest Contentful Paint. Everything happens locally in the browser, so even large batches of private images never get uploaded anywhere.

The tool works by decoding your source image into raw pixels, then re-encoding it through the browser's image codecs at a quality setting you control, typically on a 0 to 100 scale. Lossy formats like JPEG and WebP discard high-frequency detail that the eye barely notices, which is why a quality of 75 to 85 often cuts file size dramatically with little visible difference. Choosing a modern format such as WebP or AVIF usually beats JPEG at the same perceptual quality because their compression algorithms are more advanced.

Use it to prepare hero images and thumbnails for the web, shrink screenshots before sharing, or fit photos under upload size limits on forms and marketplaces. It complements the Image Converter when you want to change format and compress in one pass, and the Image Resizer when shrinking dimensions would cut size even further — resizing first, then compressing, gives the smallest possible result. For graphics with text or sharp edges, PNG or high-quality WebP preserves crispness better than aggressive JPEG.

Practical tips: compare before-and-after previews and file sizes to find the lowest quality that still looks acceptable, since the sweet spot varies by image content. Photographs tolerate more compression than logos or screenshots with flat color and text. If a re-compressed JPEG looks blocky, raise the quality or switch to WebP, and remember that repeatedly compressing the same lossy image degrades it cumulatively — always start from the highest-quality original you have.