How does compression shrink my image?

It re-encodes the picture at a smaller size and quality you control, cutting file size while keeping it usable.

Are images sent to a server to compress?

No. Everything is processed in your browser, so the original never leaves your device.

At moderate settings the difference is hard to see; lower quality only if you need a very small file.

Photos often drop 60–80% depending on content and the target quality you choose.

Yes, though JPG and WebP usually compress photos far better than PNG.

There is no server limit; very large images just take a little longer to process locally.

用质量滑块缩小文件体积。

文件

将文件拖放到此处 或点击选择文件。

Quality 0.8

通过质量滑块在压缩率与画质间权衡，缩小 JPEG 和 PNG 体积。处理在本地完成，敏感图片也不会外传。

使用方法

常见问题

How does compression shrink my image?: It re-encodes the picture at a smaller size and quality you control, cutting file size while keeping it usable.
Are images sent to a server to compress?: No. Everything is processed in your browser, so the original never leaves your device.
Will the photo look noticeably worse?: At moderate settings the difference is hard to see; lower quality only if you need a very small file.
What size reduction can I expect?: Photos often drop 60–80% depending on content and the target quality you choose.
Can I compress PNG files too?: Yes, though JPG and WebP usually compress photos far better than PNG.
Is there a file size limit?: There is no server limit; very large images just take a little longer to process locally.