图片压缩器

是的 — 免费，无限批量处理，无需注册，无水印。

No. This image compressor runs entirely in your browser — you can watch the Network tab while you compress and you will see no upload of your images. Tools that need server processing are labeled separately and ask before uploading.

通常可以，且每行显示真实的转换前后大小——我们不预先承诺某个百分比，因为诚实的答案取决于图像本身。如果图像已经压缩得很好，工具会保留您的原始文件并标记为已优化，而不是给您一个更大的文件。

PNG 是无损格式，因此重新压缩可能几乎不会改变其大小——有时甚至完全不会缩小。当发生这种情况时，该工具会告知您并保留原始文件。如果您想要真正更小的 PNG，将其转换为 WebP 通常有效，格式切换一键即可完成。

推荐 80 是日常设置 — 对大多数照片在视觉上难以区分，而体积小得多。平衡 60 对网页缩略图和预览压缩更狠。极限 40 适用于大小比保真度更重要的场合。滑块可让您在两者之间微调任意数值。

Re-encoding strips EXIF and GPS metadata — camera model, location and timestamps don’t carry over. If the tool keeps an already optimized original instead, that file is unchanged and its metadata stays with it. Do not use this compressor as a guaranteed metadata remover.

是的 — 将输出开关切换为“转换为 WebP”，每张图片都会重新编码为 WebP，这通常能使其更小。如果您的浏览器无法编码 WebP，该开关将被禁用，您的输出将保持原始格式。

JPEG (JPG), PNG and WebP files in, JPEG/PNG/WebP out. HEIC photos: convert them with our HEIC to JPG tool first. Large photos take a moment — big images are re-encoded at high quality, which takes a second or two each.

添加 JPEG，选择质量等级后即可下载——以推荐值 80 重新编码可去掉大多数照片不需要的字节。每一行都会显示压缩前后的真实大小，在保留之前您可以确切看到文件缩小了多少。

先压缩，再看每一行显示的大小——邮件服务商通常将整封邮件限制在 20–25 MB 左右。均衡 60 或极限 40 能把手机照片压到仅几百 KB，切换到 WebP 通常还能进一步缩小。

Not as a fixed target — we won’t promise a number we can’t keep. Drag the quality slider and watch the size update on each row until it lands where you need it, then download that file. For a target size, try our Compress Image to KB tool, which automatically adjusts quality and may resize the image to meet the limit.

To compress JPG images aggressively, choose a lower quality setting — Extreme 40 is the lowest quality preset — and try Convert to WebP. Each row shows the real before-and-after size, so you can raise the quality if the image looks too rough.