MP4 轉 MP3轉換工具

A free MP4 to MP3 converter for MPEG-4 Part 14 files. Browser-based pairs here usually run in this tab, with no file upload.

把你的 MP4 檔案拖曳到這裡

or 瀏覽你的裝置 · 貼上快捷鍵 Ctrl+V

Accepts .mp4 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 MP4 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
MP3 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 MP3
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。

MP4

MPEG-4 Part 14

最通用的影片容器格式。MP4 內包 H.264 影片與 AAC 音訊，幾乎能在過去十五年推出的每一支手機、瀏覽器、電視和剪輯軟體上播放，因此是分享與上傳時最安全的預設格式。

開發者: ISO/IEC (MPEG)
發布年份: 2001
副檔名: .mp4
MIME 類型: video/mp4
壓縮方式: 有損
規格文件: 開放

MP3

MPEG-1 Audio Layer III

讓數位音樂普及的格式，至今仍是相容性最高的音訊檔案格式。它的專利已於 2017 年到期，現在可以自由使用。192–320 kbps 對幾乎所有聽眾來說都已無法察覺損失。

開發者: Fraunhofer IIS
發布年份: 1993
副檔名: .mp3
MIME 類型: audio/mpeg
壓縮方式: 有損

轉換前值得了解的事

Both MP4 and MP3 are lossy formats, so repeated conversions can accumulate rounding artifacts. Keep this to only what you need and avoid repeated round-trips.
這次轉換只會保留音訊軌——畫面會被完全捨棄。

FAQ

關於 MP4 轉 MP3 的常見問題

這個 MP4 轉 MP3 轉換器是免費的嗎？

是的。在這裡把 MP4 轉換為 MP3 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 MP4 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.

MP4 轉 MP3 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 MP4 轉換為 MP3 會損失品質嗎？

MP3 is a lossy format, so some detail is discarded when it is encoded. At the default quality setting the change is often not visually obvious; keep your original MP4 file if you might need it again.

可以一次把多個 MP4 檔案轉換為 MP3 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.

MP4 轉 MP3 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 MP3

這裡有 41 種格式可以轉換成 MP3。

將 MP4 轉換為其他格式

一個 MP4 檔案可以轉換成以下任何一種格式。