Image compression
Batch-compress JPG / PNG / WebP with limits on edge length and quality; the size before and after is right there.
把图片拖到这里，或点击选择
支持 JPG / PNG / WebP / GIF / BMP，可多选；单张建议不超过 30MB
压缩设置
提示：JPG / WebP 不支持透明，PNG 的透明区域会被填充为白色；需要保留透明请选 PNG 输出。
图片压缩怎么用、压到多小合适？
典型场景：网申/招聘平台要求附件不超过 1MB、微信发原图太慢、上传证件照提示"文件过大"、网页配图拖慢加载。这些场景通常只需要把长边压到 1280~1920 像素、质量 75%~85%，体积能降到原来的三分之一到一半，肉眼几乎看不出差异。
两个参数怎么配合：「最大边长」解决的是"分辨率过高"（手机随手拍就是 4000 像素宽）；「质量」解决的是"压缩率"。如果图片只是尺寸大、画面本身简单，先降边长效果最明显；如果图片细节多，降边长比降质量更划算——过度降低质量会出现块状噪点，而降边长只是缩小尺寸。
什么时候不要用有损压缩：需要提交扫描件、身份证、合同、发票等"要看清文字"的材料时，建议质量 90% 以上并保留 JPG；如果原图是截图或含文字的 PNG，转成 JPG 会让文字边缘发虚，此时更好的做法是保持 PNG 或改用「图片裁剪」把多余部分裁掉来减小体积。
关于隐私：本页所有压缩都在你的浏览器里完成，图片不会被上传到任何服务器——你可以打开浏览器开发者工具的 Network 面板自行确认。这意味着证件照、合同、工资条这类敏感图片也可以放心处理。
FAQ
If the original was already squeezed by another tool (a PNG screenshot most of all), re-encoding can push the size up instead of down. When that happens: switch the output to WebP, or lower the maximum edge length first.
Modern browsers, WeChat and mainstream apps all support it; but some old systems, or platforms that only accept JPG, will reject it - when in doubt, pick JPG.
Not directly - browsers cannot decode that format. Please run the photo through our “HEIC to JPG” tool first (the photo is processed locally in your browser, never uploaded), then come back to this page to compress it.
No hard cap on the count - tens at a time is fine, they are processed one by one; you are only bounded by your machine's memory. As a comfort zone, keep it under 50 images per run and 30 MB per image.