JPG 转 PNG 转换器
A free JPG to PNG converter for JPEG files. Browser-based pairs here usually run in this tab, with no file upload.
将你的 JPG 文件拖放到这里
or 浏览你的设备 · 粘贴快捷键 Ctrl+V
Accepts .jpg, .jpeg, .jpe, .jfif files. You can queue several files; each is processed one after another on your own device.
你的文件永远不会离开这台设备 —— 没有上传，也就没有服务器可以从中删除它们。
- 01
添加你的 JPG 文件
将文件拖放到上方的方框里，或点击浏览选择。它们会直接从磁盘读取 —— 不会发送到任何地方。
- 02
检查设置
PNG is already selected. Open the gear icon on any row if you want to change quality, dimensions or codec before converting.
- 03
下载你的 PNG
点击转换，等待该行处理完成。转换多个文件时，可以将它们全部打包为一个 ZIP 一次性下载。
JPG
JPEG诞生三十年后，依然是照片的默认格式。它的有损压缩会丢弃肉眼几乎察觉不到的细节，质量 75–85 是最佳区间，能大幅缩小文件而不产生可见损伤。不支持透明度。
- 开发者
- Joint Photographic Experts Group
- 发布时间
- 1992
- 扩展名
- .jpg, .jpeg, .jpe, .jfif
- MIME 类型
- image/jpeg
- 压缩方式
- 有损
- 规范
- 开放
PNG
Portable Network Graphics带有真正 alpha 通道的无损压缩格式，作为 GIF 的自由替代品而诞生。非常适合边缘锐利的标志、截图和界面美术；用于照片则会比较浪费，因为 JPEG 或 WebP 的体积只是它的一小部分。
- 开发者
- PNG Development Group / W3C
- 发布时间
- 1996
- 扩展名
- .png
- MIME 类型
- image/png
- 压缩方式
- 无损
- 规范
- 开放
- JPG is lossy and PNG is lossless. Re-saving cannot recover details removed by the lossy source. The output is usually larger with similar visible quality, not a repaired original.
关于 JPG 转 PNG 的常见问题
这个 JPG 转 PNG 转换器是免费的吗？
是的。在这里把 JPG 转换为 PNG 完全免费，无需账号、没有水印、也没有每日次数限制。处理在你自己的设备上完成，因此不存在需要转嫁给你的服务器成本。
我的 JPG 文件会被上传到任何地方吗？
For browser-based pairs, your file is read locally and converted by Squoosh in this tab. No file payload is uploaded; you may still see analytics and engine downloads in network logs.
JPG 转 PNG 有文件大小限制吗？
There is no imposed upload cap when it runs in-browser, but each conversion still depends on your device and browser memory. Large videos are the first practical limit, then memory-heavy documents or images.
把 JPG 转换为 PNG 会损失质量吗？
Nothing is intentionally discarded in this step, because PNG is lossless. A JPG file encoded with lossy settings stays lossy, so missing detail is not recovered.
可以一次把多个 JPG 文件转换为 PNG 吗？
Yes. Drop in several files and each gets its own row; they are processed one after another on your device. You can download them one by one or as one ZIP.
JPG 转 PNG 能在手机、Mac 或 Chromebook 上使用吗？
Most modern browsers on Windows, macOS, Linux, ChromeOS, Android and iOS work. Very large videos are often more reliable on desktop or a browser with more memory.
Why do some conversions take longer on first run?
The conversion engine has to download first. Small codec bundles are fast, while ffmpeg is commonly 12–30 MB; later conversions of similar type use the cached engine.
I converted a file and the output is blank or unusable. What should I check?
Start over with default settings, then change one option at a time (quality, bitrate, page size, or codec) to isolate what changed behavior. If it keeps failing, retry with a smaller file and confirm the source format matches the pair.
将其他格式转换为 PNG
此处共有 16 种格式可以转换为 PNG。
将 JPG 转换为其他格式
一个 JPG 文件可以转换为以下任意一种格式。