Compress Image
Make images smaller without sending them anywhere.
How to compress image
- Drop your images in — or pick them with the button. Nothing is uploaded.
- Choose a format and drag the quality slider. The preview updates live.
- Check the before-and-after view, then download.
About this tool
Most images on the web are several times larger than they need to be. A photo straight out of a phone camera is routinely four to twelve megabytes, when the same picture at the same visible quality can sit comfortably under one. That difference is what makes pages slow, what fills up storage, and what makes email attachments bounce.
This tool re-encodes your images with modern codecs — MozJPEG, libwebp, and libavif, the same encoders used by professional image pipelines — compiled to WebAssembly so they run at native-like speed inside your browser. You get the compression quality of a desktop tool without installing one, and without your photographs travelling across the internet to a stranger's server.
The side-by-side comparison matters more than the number on the slider. Compression artefacts show up differently depending on the picture: flat gradients like skies band before a busy street scene does. Rather than guessing at a quality setting, drag the divider across the preview and decide with your own eyes where the trade-off stops being worth it.