Choose an image size and quality you can actually use
A large photograph can be inconvenient in an email, product page or website. This image compressor starts with one local file and lets you choose an output format and quality. After generating a result, compare its appearance and actual byte size with the source. A larger percentage reduction is not automatically better: small lettering, hair, shadows and textured surfaces can show compression damage before a simple background does.
Try WebP for a supported website image, or choose JPG when the receiving system specifically requires it. PNG and WebP can keep transparent areas; JPG requires a chosen background. Begin with a higher quality setting, inspect important details, then try a lower setting if needed. This page gives you direct quality control. Use a target-size tool when the requirement is an explicit byte ceiling.
Worked example
For a 160 by 100 pixel PNG, keeping the width and height unchanged while choosing WebP tests format and quality independently of resizing. The result may be smaller or larger; the displayed byte count and downloaded file are the evidence. If the receiving page only displays an 80 by 50 image, use Resize an image to change those dimensions explicitly.
Local processing and limits
One supported static image is processed at a time. The general input limit is 10 MiB and twelve million pixels; AVIF processing is limited to four million pixels. Unsupported animation, image sequences, HDR and unverified container features are refused. Large images need more memory even when their compressed file is small. A failed operation does not switch to a server-upload fallback.
The browser downloads its own application and codec resources from the same host. Your selected image, result, filename and metadata are not sent to an upload service. Images are not written to localStorage, IndexedDB or a service-worker recovery cache. Reloading the page leaves the image workspace empty. Downloaded files remain under your control; inspect them before sharing.