All Converter Pro
在线 PNG 转 JPG
在线免费将 PNG 转换为 JPG,大幅减小文件大小。非常适合照片、邮件附件和有大小限制的上传表单。无需注册。
关于此 PNG 转 JPG 工具
This converter turns a PNG image into a JPG, usually shrinking the file dramatically - a photo saved as PNG is often 5–10× larger than the same photo as a high-quality JPG. Convert when a form or portal rejects PNG or enforces a size limit, when email attachments are too heavy, or when you need faster-loading images and WebP is not an option. One thing to know before converting: JPG does not support transparency. If your PNG has a transparent background (common for logos), the transparent areas will be filled with a solid background in the JPG. For logos and graphics with sharp text, PNG or WebP usually remains the better format; for photos, JPG is exactly right.
如何使用 PNG 转 JPG
- 打开工具并添加您的文件、文字或数值。
- 检查可用选项,例如页面范围、输出格式、质量、密码或语言。
- 开始处理,并在完成前保持浏览器窗口打开。
- 下载结果,如有需要可继续使用相关工具。
实用提示
- 对于扫描的 PDF,支持 OCR 的工具会尽可能自动运行文字识别。
- 对于大文件,在通过邮件分享或上传到门户网站之前,请使用压缩工具。
- 为获得最佳效果,请上传扩展名正确的干净文件,避免使用损坏的文档。
How to convert PNG to JPG and keep the file small
Upload your PNG, press convert and download the JPG. A photo saved as PNG is often 5 to 10 times larger than the same photo as JPG, so this is the quickest way to get under an upload size limit.
Need a specific size such as 200 KB or 100 KB? Convert to JPG first, then run the result through the Image Compressor and lower the quality until it is under your limit.
PNG or JPG: which is better?
Use JPG for photos, email attachments and forms with size limits. Use PNG for logos, screenshots with small text, and anything that needs a transparent background.
常见问题
What happens to a transparent background?
JPG cannot store transparency, so transparent areas of the PNG are filled with a solid background color in the output. If you need to keep transparency, stay with PNG or convert to WebP instead.
How much smaller will my file get?
For photographic images, typically 70–90% smaller. For screenshots and graphics the saving is smaller, and fine text may show slight JPG artifacts.
Does converting to JPG lose quality?
JPG is a lossy format, so a small amount of detail is discarded - at the quality level used here it is generally invisible for photos. Avoid converting images you plan to edit repeatedly.
When should I NOT convert PNG to JPG?
Logos, icons, screenshots with small text, and images needing transparency. JPG artifacts show most on sharp edges and flat colors - exactly what those images contain.
Is this the same as compressing the image?
Related but different: this changes the format. If you want to keep PNG format but reduce size, use the Image Compressor tool instead.
How do I convert PNG to JPG under 200 KB?
转换 the PNG to JPG here, then use the Image Compressor and reduce the quality until the file is under 200 KB. Photos usually reach that size easily.
the converter 免费吗?
Yes - free, no account, no watermark, and uploads are cleaned from temporary storage automatically.