PNG 转 JPG 在线转换器

只需 3 步，轻松将您的 PNG 文件转换为 JPG 格式。

JPG⌄

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⚙ 可选设置

Resize

Color Filter

DPI

dpi

Crop (px)

PNG vs JPG：完整格式指南

PNG

Lossless

压缩

JPG

Lossy

PNG

Full 8-bit alpha channel — each pixel can be any opacity level from fully transparent (0) to fully opaque (255)

透明度

JPG

Not supported — transparent areas always render as solid white or the specified matte color

PNG

Not in standard PNG; APNG (Animated PNG) is a non-standard extension with limited, inconsistent support

动画

JPG

Not supported

PNG

24-bit RGB (16.7M colors) or 32-bit RGBA (16.7M colors + full alpha); up to 48-bit for professional workflows

色彩深度

JPG

24-bit (8 bits per channel: RGB) — up to 16.7 million colors

PNG

100 KB – 10 MB — significantly larger than JPG for photographic content

文件大小

JPG

50 KB – 5 MB per image depending on resolution and quality setting

PNG

Universal — all modern browsers, operating systems, and devices including IE7+

浏览器支持

JPG

Universal — all browsers, all operating systems, all devices including IE6 and older smartphones

PNG

Graphics, logos, UI

最适合

JPG

Photos, web images

常见使用场景：PNG → JPG

📸 Web photography publishing📧 Email photo attachments📱 Social media image posts🖨️ Online photo printing🛒 Product photography catalogs📰 Blog and editorial images

⚠️Transparent areas in the source PNG will become solid white in the converted JPG output. Only convert PNG images without transparency. For transparent graphics intended for web use, WebP is a far better target format.

Format

PNG

PNG was created in 1996 as a free, patent-unencumbered alternative to GIF after Unisys enforced its LZW compression patent. The PNG Development Group introduced full-color support, genuine alpha trans…

优点

+Lossless — every pixel preserved with zero compression artifacts

+Full 8-bit alpha channel for smooth, semi-transparent edges

+Ideal for text, logos, and graphics where sharpness is non-negotiable

+Unlimited re-saves without any quality degradation whatsoever

局限性

−3–5× larger than JPG for photographic content

−No native animation support in standard PNG

−Slower to load than WebP for equivalent image content

−Not practical for very high-resolution photographs at web scale

Logos, icons, and brand marks placed over any background colorScreenshots where text must remain perfectly sharpImages edited in multiple passes (keep as the master file)Web UI elements, buttons, icons, and interface assets

Format

JPG

Standardized in 1992 by the Joint Photographic Experts Group, JPEG became the internet's dominant image format through the 1990s. Its DCT compression made digital photography practical for early web a…

优点

+Smallest file sizes for photographs (10:1 to 20:1 compression ratio)

+Universal compatibility across every device, software, and platform

+Embeds EXIF metadata (GPS, camera settings, date/time)

+Adjustable quality/size trade-off at save time

局限性

−Lossy — permanently discards image data with every save

−No transparency — backgrounds are always solid

−Visible block artifacts on sharp edges, text, and high-contrast areas

−Quality degrades with each re-save (generational quality loss)

Sharing photographs on social media, email, or blogsCamera images where file size matters more than pixel perfectionWeb page photos where page load speed is the priorityAny context requiring maximum cross-device and software compatibility

PNG 转 JPG：您需要了解的

PNG是一种无损格式，非常适合图形，但会产生使网站和应用程序变慢的大文件。将PNG转换为JPG应用智能压缩，在摄影内容上将文件大小减少60-80%，同时几乎没有可察觉的质量损失。JPG是照片的通用格式——每台设备、浏览器、应用程序和打印服务都支持。

为什么将 PNG 转换为 JPG？

⚡

更快的网站

对于照片，JPG文件的加载速度明显快于PNG，从而提高网站性能分数。

存储效率

5 MB的PNG照片可能压缩为500 KB的JPG，节省90%的存储空间。

💾

📷

摄影标准

单反相机、图库网站和照片服务都使用JPG作为其主要分发格式。

打印兼容性

照片冲印店和按需打印服务普遍接受JPG进行所有打印作业。

🖨️

PNG

文件扩展名.png
描述PNG (Portable Network Graphics) is a lossless raster image format that supports transparency. Ideal for graphics, logos, icons, and images that require a transparent background.
相关程序Adobe Photoshop, GIMP, Microsoft Paint, Preview (Mac)
开发者PNG Development Group
MIME 类型image/png

JPG

文件扩展名.jpg
描述JPEG (Joint Photographic Experts Group) is the most widely used lossy image compression format, ideal for photographs and complex images with many colors. JPEG achieves small file sizes by discarding some image data, making it perfect for web use and sharing.
相关程序Adobe Photoshop, GIMP, Windows Photo Viewer, Preview (Mac)
开发者Joint Photographic Experts Group
MIME 类型image/jpeg