MP4 转 FLAC 转换器

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

将你的 MP4 文件拖放到这里

or 浏览你的设备 · 粘贴快捷键 Ctrl+V

Accepts .mp4 files. You can queue several files; each is processed one after another on your own device.

你的文件永远不会离开这台设备 —— 没有上传，也就没有服务器可以从中删除它们。

使用方法

01
添加你的 MP4 文件
将文件拖放到上方的方框里，或点击浏览选择。它们会直接从磁盘读取 —— 不会发送到任何地方。
02
检查设置
FLAC is already selected. Open the gear icon on any row if you want to change quality, dimensions or codec before converting.
03
下载你的 FLAC
点击转换，等待该行处理完成。转换多个文件时，可以将它们全部打包为一个 ZIP 一次性下载。

MP4

MPEG-4 Part 14

最通用的视频容器格式。MP4 中搭配 AAC 音频的 H.264 视频几乎可以在过去十五年内生产的任何手机、浏览器、电视和编辑软件上播放，因此它是分享和上传时最安全的默认选择。

开发者: ISO/IEC (MPEG)
发布时间: 2001
扩展名: .mp4
MIME 类型: video/mp4
压缩方式: 有损
规范: 开放

FLAC

Free Lossless Audio Codec

无损压缩格式，能将 WAV 的体积减半，同时逐位精确还原原始音频。开放、不受专利限制，是归档音乐收藏或出售高解析度下载版本的默认选择。

开发者: Xiph.Org
发布时间: 2001
扩展名: .flac
MIME 类型: audio/flac
压缩方式: 无损
规范: 开放

转换前值得了解

MP4 is lossy and FLAC 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.
这次转换只会保留音轨 —— 画面会被完全丢弃。

FAQ

关于 MP4 转 FLAC 的常见问题

这个 MP4 转 FLAC 转换器是免费的吗？

是的。在这里把 MP4 转换为 FLAC 完全免费，无需账号、没有水印、也没有每日次数限制。处理在你自己的设备上完成，因此不存在需要转嫁给你的服务器成本。

我的 MP4 文件会被上传到任何地方吗？

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 转 FLAC 有文件大小限制吗？

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 转换为 FLAC 会损失质量吗？

Nothing is intentionally discarded in this step, because FLAC is lossless. A MP4 file encoded with lossy settings stays lossy, so missing detail is not recovered.

可以一次把多个 MP4 文件转换为 FLAC 吗？

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 转 FLAC 能在手机、Mac 或 Chromebook 上使用吗？

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.

将 MP4 转换为其他格式

一个 MP4 文件可以转换为以下任意一种格式。