图片压缩

UpBox优盒工具箱，免费图片压缩工具，支持 JPG、PNG、WebP，按最大宽度等比缩放并调整画质，图片本地处理不上传。

无需注册 · 数据不上传No sign-up · nothing uploaded

选择图片Choose an image

点击选择或拖入图片Click to choose or drop an image 支持 JPG、PNG、WebP，图片不会上传JPG, PNG and WebP supported — nothing is uploaded

最大宽度Max width

输出格式Output format

画质Quality82%

预览与下载Preview

选择图片后在这里预览

原始尺寸—

原始大小—

压缩后—

体积变化—

选择图片后在这里预览

下载压缩图

本工具所有运算在本地浏览器完成，你的文件、文本不会上传到服务器

工具介绍

图片压缩在浏览器里完成：选一张本地图片，按需要限制最大宽度、调整画质，再导出 JPG 或 WebP。原图不会上传，也没有网络请求。 Compression happens in your browser: pick a local image, cap its width, tune quality, then export JPG or WebP. The file is never uploaded and no request is made.

只做等比缩小，不裁剪画面；适合发稿前压体积、把截图改到平台要求的尺寸，或把大图转成 WebP 减小体积。 It scales proportionally and never crops — useful for trimming file size before publishing, fitting screenshots to platform limits, or turning large images into WebP.

本地处理不上传Runs locally, no upload
按最大宽度等比缩放Proportional resize to a max width
画质 30%–98% 可调Quality from 30% to 98%
导出 JPG 或 WebPExport JPG or WebP
显示压缩前后体积Shows before and after size

使用说明

点上传区选择图片，或直接把图片拖进来。Choose an image in the drop area, or drag one in.
选择最大宽度：需要保持原尺寸就选“保持原尺寸”，否则按平台要求选 1920 / 1280 / 800。Pick a max width, or keep the original if no limit is needed.
按画质滑块调整清晰度，越靠左体积越小。Move the quality slider: further left means a smaller file.
点“开始压缩”，确认体积变化后下载结果。Compress, check the size change, then download the result.

常见问题

会裁剪图片吗？Does it crop the image?

不会。只按最大宽度等比缩小，画面内容完整保留；透明背景在 WebP 下会保留，导出 JPG 时会填成白色。No. It only scales down proportionally and keeps the whole frame. Transparency survives in WebP; JPG fills it with white.

压缩后一定更小吗？Is the result always smaller?

多数照片会明显变小。已经压过的小图、或本来就很小的 PNG 转 JPG，体积可能变化不大，甚至略大。Usually yes for photos. Already-compressed small images, or tiny PNGs converted to JPG, may barely change or even grow.

图片会被上传吗？Is my image uploaded?

不会。读取、缩放和编码全部在当前页面完成，关掉页面即释放。No. Reading, resizing and encoding all happen in this page, and everything is released when you close it.