JPG 转 PNG 转换器
免费在线将 JPG 图片转换为 PNG 格式，获得无损画质并支持透明背景。
上传 JPG 图片
拖放 JPG 文件至此处或点击选取
最多 20 个文件
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PNG 转 JPG 转换器
免费在线将 PNG 图片转换为 JPG 格式，缩小文件大小同时保持画质。
PNG 转 WebP 转换器
免费在线将 PNG 图片转换为 WebP 格式，以现代压缩技术缩小文件大小。
WebP 转 PNG 转换器
免费在线将 WebP 图片转换为 PNG 格式，获得通用兼容性与无损画质。
JPG 转 WebP 转换器
免费在线将 JPG 图片转换为 WebP 格式，以次世代压缩技术缩小文件大小。
WebP 转 JPG 转换器
免费在线将 WebP 图片转换为 JPG 格式，获得通用兼容性与可调画质。
HEIC 转 JPG 转换器
免费在线将 iPhone HEIC/HEIF 照片转换为 JPG 格式。快速、私密，完全在浏览器中运行。
使用方法
上传您的图片
拖放图片或点击选取。接受所有常见格式。
设置画质
调整输出画质以平衡文件大小与视觉保真度。
下载转换后的文件
转换后的图片数秒内即可下载。
为什么使用此工具
100% 免费
没有隐藏费用，没有付费等级——所有功能完全免费。
无需安装
完全在浏览器中运行。无需下载或安装任何软件。
隐私且安全
您的数据永远不会离开您的设备。不会上传至任何服务器。
支持移动设备
完全响应式设计——在手机、平板或桌面电脑上均可使用。
您的文件保持私密
此工具完全在您的浏览器中处理文件。不会上传至任何服务器——您的数据永远不会离开您的设备。
- 无服务器上传——100% 客户端处理
- 不存储数据——关闭标签页时文件即被丢弃
- 无需账号——无需注册即可立即使用
JPG to PNG: When You Need Transparency and Lossless Quality
Key Takeaways
- PNG supports transparent backgrounds, making it essential for logos, icons, and overlay graphics that JPG cannot handle.
- Converting JPG to PNG preserves the current quality without further compression, though it cannot restore details already lost in JPG compression.
- PNG files are typically larger than JPG because they use lossless compression — ideal for graphics but less efficient for photographs.
JPG is the most common image format for photographs, but its lossy compression and lack of transparency support make it unsuitable for many design and web development tasks. Converting JPG to PNG unlocks transparency layers, lossless quality preservation, and pixel-perfect rendering for graphics, screenshots, and professional design assets.
Over 80% of website logos and icons use PNG format for its transparency support
Web Design Fact
When to Convert JPG to PNG
Adding Transparent Backgrounds
Convert product photos or logos to PNG so you can later remove backgrounds and maintain transparency for use on websites, presentations, and marketing materials.
Preserving Screenshot Quality
Screenshots saved as JPG often show compression artifacts around text and sharp edges. Converting to PNG ensures crisp, readable text in documentation and tutorials.
Graphic Design Workflows
Design tools like Figma and Photoshop work best with PNG for layer compositing. Convert JPG source images to PNG before importing into your design projects.
Print-Ready Graphics
When preparing images for print where every pixel matters, PNG's lossless format ensures no additional quality degradation during the editing process.
Tips for JPG to PNG Conversion
Converting JPG to PNG won't improve image quality — it preserves the current state without adding further compression loss.
PNG files can be 5-10x larger than JPG for photographs. Use PNG for graphics and transparency, not for large photo galleries.
If you need transparency, convert to PNG first, then use a background removal tool to create the transparent areas.
For web use, consider converting to WebP instead if you don't need transparency with older browser support.
All image processing happens entirely in your browser. Your files are never uploaded to any server, ensuring complete privacy and fast conversion speeds.