为电子邮件、网页或仅仅为了节省空间而减小图片的文件大小。此工具可以压缩 JPG 和 PNG，并转换为更小的格式。
它在您的浏览器中本地运行，因此您的图片绝不会离开您的设备。
如何使用此工具
添加图片
将任意图片拖放到工具上，或选择文件。
选择输出质量
JPG 已默认选中，可全方位地减小体积。质量越低 = 文件越小。
对比大小
对比视图精确显示您节省了多少。
下载
下载您缩小后的图片。
本节目前仅提供英文版本。
Work out where the bytes are going first
Reducing an image file is easier if you know what is making it large. In practice it is almost always one of three things: too many pixels, too much quality, or a format that is wrong for the content.
Check the pixel dimensions before anything else. If a photograph is 4000 pixels wide and will be displayed at 800, you can cut roughly 85% of the data with no visible difference at all — more than any compressor setting will find.
The levers, in order of how much they help
| Lever | Typical saving | Cost |
|---|---|---|
| Resize to the displayed dimensions | 50–90% | None if displayed at that size |
| Move to a modern format (WebP, AVIF) | 25–60% | Needs a fallback for old browsers |
| Lower the quality setting | 20–60% | Visible artefacts if pushed too far |
| Lossless optimisation | 5–30% | None at all |
| Strip metadata (EXIF, thumbnails) | 1–5% | You may want the location and camera data |
A sequence that works
- Crop to what you actually need — unused edges are pure cost.
- Resize to the largest size it will be displayed at, doubled for high-DPI screens.
- Choose the format for the content: WebP or AVIF for photographs, lossless WebP for screenshots and line art.
- Compress at a quality you have looked at, then check the small details at 100% zoom.
- Keep the original. Every step above is one-way.
The mistake to avoid
Converting a JPEG to PNG to "reduce size" does the opposite — PNG will be several times larger, and it cannot recover the detail the JPEG already discarded. Lossless formats only ever make a photograph bigger. Move toward lossy formats for photographs and lossless ones for graphics, never the other way around.
常见问题
让图片变小最快的方法是什么？
以合理的质量将其重新编码为 JPG 或 WebP。这一单步操作即可去除大部分多余体积。
我可以把图片压缩到多小？
大多数图片可以减少 50–80%。极限在于您开始注意到质量损失的程度。
这是永久免费的吗？
是的 — 免费、无限制，且无需账号。