FLV 转 MP4 转换器
A free FLV to MP4 converter for Flash Video files. Browser-based pairs here usually run in this tab, with no file upload.
将你的 FLV 文件拖放到这里
or 浏览你的设备 · 粘贴快捷键 Ctrl+V
Accepts .flv, .f4v 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。
- 01
添加你的 FLV 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
MP4 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 MP4
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。
FLV
Flash Video在 YouTube 与 Flash 并存的年代承载网络视频的容器格式。Flash 已于 2020 年底退役，因此任何仍留存的 FLV 文件都需要转换为 MP4 才能继续播放。
- 开发者
- Adobe / Macromedia
- 发布时间
- 2002
- 扩展名
- .flv, .f4v
- MIME 类型
- video/x-flv
- 压缩方式
- 有损
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
- Both FLV and MP4 are lossy formats, so repeated conversions can accumulate rounding artifacts. Keep this to only what you need and avoid repeated round-trips.
关于 FLV 转 MP4 的常见问题
这个 FLV 转 MP4 转换器是免费的吗？
是的。在这里把 FLV 转换为 MP4 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 FLV 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.
FLV 转 MP4 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 FLV 转换为 MP4 会损失质量吗？
MP4 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 FLV file if you might need it again.
可以一次把多个 FLV 文件转换为 MP4 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.
FLV 转 MP4 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.
将其他格式转换为 MP4
此处共有 21 种格式可以转换为 MP4。
将 FLV 转换为其他格式
一个 FLV 文件可以转换为以下任意一种格式。