// 免费在线工具
压缩图片大小
压缩任意图片格式的文件大小 - JPG、PNG、WebP、AVIF、GIF 等。转换为 WebP 可获得最大节省。免费、即时、完全私密。
如何有效压缩图片文件大小
压缩图片文件大小的两种最有效技术是：（1）降低质量/压缩等级，（2）切换到更高效的格式。对大多数场景而言，将任意图片转换为 WebP 并将质量设为 75–85，可在几乎不影响可见质量的情况下实现 50–80% 的文件大小降低。
图片文件大小可以压缩多少？
| 源格式 | 输出：WebP Q80 | 典型压缩率 |
|---|---|---|
| JPEG Q100 | WebP Q80 | 60–75% |
| PNG（照片） | WebP Q80 | 70–85% |
| BMP | WebP Q80 | 90–97% |
| JPEG Q85 | WebP Q80 | 30–45% |
通过调整尺寸进一步降低文件大小
图片尺寸对文件大小影响巨大——宽高各减半可将像素数量（从而文件大小）降低 75%。如果您的图片是 4000×3000，但只会显示在 800×600，建议将其调整为该尺寸。配合格式转换，可实现 90% 以上的文件大小降低。
常见问题
Drop any image into this tool and convert to WebP at quality 75. This single step typically reduces JPEG/PNG files by 50–80%. For even more reduction, also use the resize inputs to scale the image down to its actual display dimensions - there’s no benefit to serving a 4000px-wide image on a website column that’s 800px wide.
At quality 70–75, most web images look excellent at normal viewing sizes (up to 1200px wide). At quality 60, subtle compression artifacts may appear in complex areas of the image. At quality 50 and below, artifacts become clearly visible. Use the before/after preview to find the lowest quality that still looks acceptable for your use case.
Yes, directly and significantly. A 2 MB image takes roughly 2 seconds to load on a 10 Mbps connection; a 200 KB version loads in 0.2 seconds. Google’s Core Web Vitals metric LCP (Largest Contentful Paint) is heavily influenced by image loading speed. Reducing your hero and product images to under 200 KB can meaningfully improve your SEO performance.
No - the tool runs locally in your browser with no server upload. The practical limit is your device’s RAM. Files up to 50 MB work reliably on modern devices. Very large images (100 MB+) may be slow to process on older hardware.