AU 轉 M4B轉換工具
A free AU to M4B converter for Sun Audio files. Browser-based pairs here usually run in this tab, with no file upload.
把你的 AU 檔案拖曳到這裡
or 瀏覽你的裝置 · 貼上快捷鍵 Ctrl+V
Accepts .au, .snd 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 AU 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
M4B 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 M4B
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。
AU
Sun Audio來自 Sun Microsystems 的 Unix 系統音效格式，通常裝載 8 位元 mu-law 編碼的音訊。在歷史上曾相當重要，但實務上已經過時。
- 開發者
- Sun Microsystems
- 發布年份
- 1992
- 副檔名
- .au, .snd
- MIME 類型
- audio/basic
- 壓縮方式
- 有損或無損
M4B
MPEG-4 Audiobook一種標記為有聲書的 M4A 格式，讓播放器能記住你聽到的位置並支援章節標記。Audible 有聲書解除 DRM 後通常就會變成這種格式。
- 開發者
- Apple
- 發布年份
- 2003
- 副檔名
- .m4b
- MIME 類型
- audio/mp4
- 壓縮方式
- 有損
- M4B is lossy, so if the source AU was lossless this is the first lossy step. If it was already lossy, any additional impact is often smaller.
關於 AU 轉 M4B 的常見問題
這個 AU 轉 M4B 轉換器是免費的嗎？
是的。在這裡把 AU 轉換為 M4B 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 AU 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.
AU 轉 M4B 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 AU 轉換為 M4B 會損失品質嗎？
M4B 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 AU file if you might need it again.
可以一次把多個 AU 檔案轉換為 M4B 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.
AU 轉 M4B 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 M4B
這裡有 41 種格式可以轉換成 M4B。
將 AU 轉換為其他格式
一個 AU 檔案可以轉換成以下任何一種格式。