压缩到 100KB
把任意图片免费压到 100KB 以内，浏览器本地处理，满足考试、签证等严格限制。
How to use / 使用步骤
- Upload your image(s) — several at once is fine.上传图片，可一次多张。
- The tool homes in on 100 KB automatically, shrinking dimensions a little if needed.工具自动逼近 100KB 目标，必要时略微缩小尺寸。
- Download — the result is kept under 100 KB.下载，体积保证在 100KB 以内。
About Compress Image to 100 KB / 关于本工具
100 KB is a tighter, older limit you'll meet on legacy systems: some exam-registration sites, visa and certificate portals, ID-card uploads, and bandwidth-conscious apps. Squeezing a modern multi-megabyte photo down to 100 KB is real work, and quality alone often isn't enough — at very low quality a large image still exceeds the cap. So this tool combines two levers: it lowers JPEG quality first, and if that isn't enough it also reduces the pixel dimensions, always preferring the gentlest change that still fits.
100KB 是更紧、更"老"的限制，常见于一些旧系统：部分考试报名网站、签证与证书门户、身份证件上传，以及讲究带宽的应用。把动辄数兆的现代照片压到 100KB 是个实在的活，光靠降质量往往不够——尺寸大的图即便压到很低质量仍会超标。所以本工具用两个手段配合：先降 JPEG 质量，不够时再缩小像素尺寸，并始终优先选择仍能达标的最小幅度改动。
Tips to keep it sharp / 让它保持清晰的技巧
If 100 KB makes a full photo too soft, crop to just the part that matters first — fewer pixels means quality can stay higher. For documents and ID photos, that targeted crop often makes the difference between readable and blurry.
如果 100KB 让整张照片太糊，可以先裁掉无关区域只留主体——像素更少，质量就能保留得更高。对于文档和证件照，这种有针对性的裁剪常常决定了"清晰可读"还是"糊成一团"。