3GP 轉 ALAC轉換工具

A free 3GP to ALAC converter for 3GPP Multimedia File files. Browser-based pairs here usually run in this tab, with no file upload.

把你的 3GP 檔案拖曳到這裡

or 瀏覽你的裝置 · 貼上快捷鍵 Ctrl+V

Accepts .3gp, .3g2 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。

使用方式

01
新增你的 3GP 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
ALAC 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 ALAC
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。

3GP

3GPP Multimedia File

為 3G 手機設計的精簡版 MP4，使用低位元速率與小尺寸畫面以適應早期行動網路。現在多半只會在從老舊手機救回的錄影檔中遇到。

開發者: 3GPP
發布年份: 2001
副檔名: .3gp, .3g2
MIME 類型: video/3gpp
壓縮方式: 有損

ALAC

Apple Lossless Audio Codec

Apple 的無損編碼格式，於 2011 年開放原始碼。壓縮效果與 FLAC 相當，也是 iOS 與 iTunes 原生支援的唯一無損格式。

開發者: Apple
發布年份: 2004
副檔名: .alac
MIME 類型: audio/mp4
壓縮方式: 無損
規格文件: 開放

轉換前值得了解的事

3GP is lossy and ALAC 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.
這次轉換只會保留音訊軌——畫面會被完全捨棄。

FAQ

關於 3GP 轉 ALAC 的常見問題

這個 3GP 轉 ALAC 轉換器是免費的嗎？

是的。在這裡把 3GP 轉換為 ALAC 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 3GP 檔案會被上傳到任何地方嗎？

For browser-based pairs, your file is read locally and converted by ffmpeg in this tab. No file payload is uploaded; you may still see analytics and engine downloads in network logs.

3GP 轉 ALAC 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 3GP 轉換為 ALAC 會損失品質嗎？

Nothing is intentionally discarded in this step, because ALAC is lossless. A 3GP file encoded with lossy settings stays lossy, so missing detail is not recovered.

可以一次把多個 3GP 檔案轉換為 ALAC 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.

3GP 轉 ALAC 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 3GP 轉換為其他格式

一個 3GP 檔案可以轉換成以下任何一種格式。