Free Image Compressor for JPEG and WebP
Compress a photo in your browser with a quality slider. 100% 在浏览器本地处理。绝对隐私，零上传——文件不会离开此设备。
Compress image re-saves a JPEG or WebP at a lower quality and downloads the smaller picture. PNG stays lossless, so it may not shrink.
Compare the preview before you replace the original. Re-saving a JPEG more than once adds artifacts.
Questions
Which format gets smaller?
JPEG and WebP follow the quality slider. PNG does not use that slider.
Is the photo uploaded?
No. Compression happens on a canvas in this tab.