Lossless baseline for further work.
PNG preserves every detail of the source JPEG, which prevents additional quality loss during subsequent edits or re-encoding. The original JPEG compression cannot be undone, but no new artifacts will be introduced.
為什麼要轉換
01
PNG preserves every detail of the source JPEG, which prevents additional quality loss during subsequent edits or re-encoding. The original JPEG compression cannot be undone, but no new artifacts will be introduced.
02
PNG is accepted by a wider range of image viewers, editors, and content systems than JPEG. The conversion removes a recurring compatibility friction without changing what the file actually contains.
03
PNG is well documented and decodable by long-lived tooling, which matters for archives, deliverables, and any file that needs to outlive the software that created it.
在任何現代瀏覽器中造訪本頁 —— 無需安裝、無需註冊、無需外掛。
將 JPEG 檔案拖入放置區,或點擊從你的裝置中選取。
轉換完全在你的瀏覽器中進行。完成後,PNG 檔案會自動下載至你的裝置。
品質與保真度
格式規格
相容性
| 平台 | Windows | macOS | iOS | Android | Chrome | Firefox | Safari | Edge |
|---|---|---|---|---|---|---|---|---|
| JPEG | 原生 | 原生 | 原生 | 原生 | 原生 | 原生 | 原生 | 原生 |
| PNG | 原生 | 原生 | 原生 | 原生 | 原生 | 原生 | 原生 | 原生 |
為什麼選 LocalConvert
| Category | LocalConvert | 雲端轉換器 |
|---|---|---|
| 隱私 | Files never leave your device. The whole pipeline runs in your browser via WebAssembly. | Files travel to a remote server, sit in queue storage, and may be retained for analytics or moderation. |
| 費用 | Free, no signup, no daily quotas. | Often free for small files; paid tiers for batch / large / commercial use. |
| 限制 | Limited only by your device's memory and CPU. Multi-GB files OK on desktop. | Typical 100 MB to 1 GB per-file caps, plus rate limits. |
A lossy format for photographic images that strikes a strong balance between size and quality.
Typical uses
Photos, web images, email attachments.
A lossless raster format with alpha transparency, ideal for screenshots, icons, and graphics where pixel-perfect detail matters.
Typical uses
Screenshots, logos, UI assets, web graphics with transparency.
是的。LocalConvert 完全免費,無需註冊,也沒有每檔案或每日的限制。
不會。JPEG 到 PNG 的轉換完全在你的瀏覽器內透過 WebAssembly 完成 —— 你的檔案永遠不會離開你的裝置。
沒有固定上限 —— 實際限制取決於你裝置的可用記憶體。在低記憶體裝置上,非常大的檔案可能耗時較久或失敗。
可以 —— 頁面載入後,JPEG 到 PNG 的轉換無需網路連線即可運作。重新開啟頁面一次即可快取。
LocalConvert 使用業界標準工具(FFmpeg、ImageMagick、Pandoc)—— 品質與專業人員在命令列中使用的相當。有損格式每次重新編碼仍會損失一些品質。
Last verified:
JPEG to PNG is processed in your browser with WebAssembly. No upload, no tracking, no limits. Your file never leaves your device.