JPG vs PNG
JPG vs PNG compared — compression, transparency, quality and file size, plus free converters and an image compressor.
JPG uses lossy compression that shrinks photos at the cost of some detail; PNG uses lossless compression and supports transparency, making it best for graphics, logos and screenshots.
JPG vs PNG at a glance
| JPG | PNG | |
|---|---|---|
| Compression | Lossy (smaller) | Lossless (larger) |
| Transparency | No | Yes (alpha) |
| Best for | Photographs | Logos, icons, screenshots, text |
| Quality loss | Yes, on each save | None |
| File size | Small | Larger for photos |
When to use JPG
Choose JPG for photographs and large images where small file size matters more than perfect detail or transparency.
When to use PNG
Choose PNG for graphics with sharp edges, text or transparency — logos, icons, UI screenshots — where lossless quality matters.
Tools for JPG & PNG
JPG vs PNG
什么样的质量级别算是"足够好"？
对于网页用途，75%–85% 通常在肉眼看来与原图几乎无异，但文件体积只有原来的一小部分。建议针对你自己的图片和显示设备多做几次尝试。
为什么 PNG 输出不受质量滑块影响？
PNG 是无损压缩格式，质量始终固定在 100%。如果想调节压缩程度，请改用 JPG 或 WebP。
这个工具和 TinyPNG / Squoosh 相比如何？
Squoosh 拥有更先进的编码器（MozJPEG、libwebp），如果需要极致的压缩效果，建议使用 Squoosh。本工具则更注重简洁易用，且不依赖外部服务。