Compress Images for Web Without Losing Quality
Shrink image file sizes so your pages load fast, while keeping them looking sharp — all locally in your browser.
减小图片体积让页面加载更快，同时保住清晰观感——全程在你的浏览器本地完成。
为什么要压缩？
大图是页面变慢的头号原因。一张 4 MB 的照片常常能在肉眼看不出差别的前提下压到 200 KB 以内，让站点瞬间变快，也为访客省流量。
够用的目标体积
- 信息流 / 图库图：200 KB 以内。
- 头图 / Banner：100 KB 以内。
- 头像 / 缩略图：100 KB 以内（用「压缩到 100KB」工具）。
批量压缩整个文件夹
打开「批量图片压缩」，把整个文件夹拖进去。默认质量约 80%，对屏幕和网页完全够用，也可按需调高调低。
卡死某个上限
上传表单常把附件限制在 100 KB。「压缩到 100KB」工具会用二分法寻找最佳质量，让输出稳定落在限制内。
网页优先用 WebP
如果目标环境支持，转成 WebP——同等画质通常比 JPG 再小 25–35%。记得保留原图以便后续编辑。
小技巧
只有在需要透明时才用 PNG；照片类用 80% 的 JPG 最划算。对已经很小的 JPG 再压通常没用，还可能出噪点。
Shrink image file sizes so your pages load fast, while keeping them looking sharp — all locally in your browser.
Why compress at all?
Large images are the #1 cause of slow pages. A 4 MB photo can often drop to under 200 KB with no visible difference, which makes your site feel instant and saves bandwidth for everyone.
Target sizes that work
- Feed / gallery images: under 200 KB.
- Hero / banner: under 100 KB.
- Avatars / thumbnails: under 100 KB (see the 100 KB tool).
Bulk shrink a folder
Open the Bulk Image Compressor and drop in a whole folder. It keeps quality around 80% by default, which is plenty for screens and web, and you can raise or lower it per need.
Hit an exact limit
Upload forms often cap attachments at 100 KB. The Compress to 100KB tool binary-searches the best quality so the output reliably lands under the limit.
Use WebP for the web
If the destination supports it, convert to WebP — it is typically 25–35% smaller than JPG at the same quality. Keep originals for editing.
Quick tips
Keep PNG only when you need transparency; for photos, JPG at 80% is the sweet spot. Re-compressing an already-small JPG rarely helps and can add artefacts.