图片压缩Image Compressor
在线图片压缩，支持JPG/PNG/WebPCompress images online, supports JPG/PNG/WebP.
点击或拖拽上传图片
支持 JPG、PNG、WebP，可批量上传
关于 图片压缩About Image Compressor
图片过大是网页加载缓慢的头号原因，也浪费带宽与存储。本工具在浏览器本地压缩 JPG、PNG、WebP 图片，在几乎不损失观感的前提下显著减小体积；图片不上传服务器，隐私更有保障。Oversized images are the top cause of slow page loads and wasted bandwidth and storage. This tool compresses JPG, PNG and WebP images locally in the browser, shrinking size dramatically with little visible loss — and your images never leave your device.
使用方法How to Use
- 选择或拖入需要压缩的图片。Select or drop the image to compress.
- 调整目标质量等参数。Adjust the target quality and other parameters.
- 查看压缩前后的体积对比与预览效果。Review the before/after size comparison and preview.
- 下载压缩后的图片。Download the compressed image.
常见问题FAQ
压缩是有损的还是无损的？Is compression lossy or lossless?
JPG/WebP 通过质量参数以较小损失换取体积；质量越低体积越小。PNG 场景则主要做无损优化。根据用途在体积与画质间取舍。JPG/WebP trade a little quality for size via a quality parameter — lower quality, smaller file. PNG is mainly optimised losslessly. Balance size and fidelity per use case.
网页图片用什么格式最好？Which format is best for the web?
同等画质下 WebP 体积通常最小；照片类兼容需求强时用 JPG；图标、截图等需要清晰边缘或透明的用 PNG。WebP is usually smallest at equal quality; use JPG for photos when compatibility matters, and PNG for icons or screenshots needing crisp edges or transparency.
压缩私人照片安全吗？Is it safe to compress private photos?
安全。整个压缩过程在浏览器本地完成，图片不会上传到任何服务器，比多数在线压缩服务更让人放心。Yes. Compression happens entirely in your browser; images are never uploaded, making it safer than most online compression services.
压缩会损失画质吗？Does compression lose quality?
JPG/WebP 为有损压缩，质量参数可调；PNG 采用无损压缩。建议从 70–80 质量起步，多数照片在该区间肉眼几乎无感。JPG/WebP are lossy with adjustable quality; PNG is lossless. Start around 70–80 quality — most photos look identical to the eye there.
图片会上传到服务器吗？Are my images uploaded to a server?
不会。压缩完全在浏览器本地（Canvas）完成，图片不离开设备，适合处理证件照、截图、商业素材等敏感图片。No. Compression happens entirely in your browser (Canvas); images never leave your device — safe for ID photos, screenshots and commercial assets.
相关阅读Related Reading
图片加水印的正确姿势：可见水印、盲水印与版权保护的边界Watermarking Images the Right Way: Visible Watermarks, Blind Watermarks and the Limits of Copyright Protection
水印不是防盗的银弹，但用对了能显著提高盗用成本。本文从可见水印的摆放策略讲起，对比盲水印与数字指纹的原理，并给出版权保护的真实边界与实操建议A watermark is no silver bullet against theft, but done right it raises the cost of misuse considerably. This article starts with visible-watermark placement, compares how blind watermarks and digital fingerprints work, and lays out the real limits of copyright protection plus practical advice.
网页图片格式怎么选：JPG、PNG、WebP 使用与压缩实践Choosing Web Image Formats: JPG, PNG, WebP and Compression in Practice
图片通常占网页体积的一半以上。本文对比三大格式的特点与适用场景，给出选型决策路径与压缩参数建议，帮你把页面加载速度提一个档次。Images typically account for over half of a page’s weight. This article compares the three major formats, offers a decision path and compression settings, and helps you move your page load time up a class.
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