JPG 轉 PNG轉換工具
A free JPG to PNG converter for JPEG files. Browser-based pairs here usually run in this tab, with no file upload.
把你的 JPG 檔案拖曳到這裡
or 瀏覽你的裝置 · 貼上快捷鍵 Ctrl+V
Accepts .jpg, .jpeg, .jpe, .jfif files. You can queue several files; each is processed one after another on your own device.
你的檔案不會離開這台裝置——沒有上傳，也沒有伺服器可以刪除它們。
- 01
新增你的 JPG 檔案
把檔案拖放到上方的方框，或點擊以瀏覽選取。檔案會直接從磁碟讀取——不會傳送到任何地方。
- 02
檢查設定
PNG is already selected. Open the gear icon on any row if you want to change quality, dimensions or codec before converting.
- 03
下載你的 PNG
按下轉換，等待該列完成即可。若轉換多個檔案，可以將它們一起打包成單一 ZIP 檔下載。
JPG
JPEG問世三十年後，依然是照片的預設格式。它的有損壓縮會捨棄肉眼幾乎察覺不到的細節，75–85 的品質數值正是能大幅縮小檔案、又不留下明顯損傷的甜蜜點。不支援透明度。
- 開發者
- Joint Photographic Experts Group
- 發布年份
- 1992
- 副檔名
- .jpg, .jpeg, .jpe, .jfif
- MIME 類型
- image/jpeg
- 壓縮方式
- 有損
- 規格文件
- 開放
PNG
Portable Network Graphics具備真正 Alpha 透明色版的無損壓縮格式，最初是作為 GIF 的免費替代品而誕生。非常適合用於標誌、螢幕截圖與邊緣銳利的介面美術；用在照片上則相當浪費，因為 JPEG 或 WebP 的檔案大小只會是它的一小部分。
- 開發者
- PNG Development Group / W3C
- 發布年份
- 1996
- 副檔名
- .png
- MIME 類型
- image/png
- 壓縮方式
- 無損
- 規格文件
- 開放
- 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.
關於 JPG 轉 PNG 的常見問題
這個 JPG 轉 PNG 轉換器是免費的嗎？
是的。在這裡把 JPG 轉換為 PNG 完全免費，不需要帳號、沒有浮水印，也沒有每日次數限制。處理在你自己的裝置上完成，因此沒有需要轉嫁給你的伺服器成本。
我的 JPG 檔案會被上傳到任何地方嗎？
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 轉 PNG 有檔案大小限制嗎？
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 轉換為 PNG 會損失品質嗎？
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.
可以一次把多個 JPG 檔案轉換為 PNG 嗎？
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 轉 PNG 能在手機、Mac 或 Chromebook 上使用嗎？
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.
將其他格式轉換為 PNG
這裡有 16 種格式可以轉換成 PNG。
將 JPG 轉換為其他格式
一個 JPG 檔案可以轉換成以下任何一種格式。