FLV to M4V converter
A free FLV to M4V converter for Flash Video files. Browser-based pairs here usually run in this tab, with no file upload.
Drop your FLV files here
or browse your device · paste with Ctrl+V
Accepts .flv, .f4v files. You can queue several files; each is processed one after another on your own device.
Your files never leave this device — there is no upload and no server to delete them from.
- 01
Add your FLV files
Drop them onto the box above or click to browse. They are read straight from disk — nothing is sent anywhere.
- 02
Check the settings
M4V is already selected. Open the gear icon on any row if you want to change quality, dimensions or codec before converting.
- 03
Download your M4V
Press convert and wait for the row to finish. Convert several files and you can take them all as a single ZIP.
FLV
Flash VideoThe container that carried web video through the YouTube-and-Flash years. Flash was retired at the end of 2020, so any FLV you still have needs converting to MP4 to stay playable.
- Developed by
- Adobe / Macromedia
- Released
- 2002
- Extension
- .flv, .f4v
- MIME type
- video/x-flv
- Compression
- Lossy
M4V
iTunes VideoApple's MP4 variant used by iTunes, occasionally carrying FairPlay DRM. Files without DRM are effectively MP4; the extension mainly tells Apple software how to treat them.
- Developed by
- Apple
- Released
- 2005
- Extension
- .m4v
- MIME type
- video/x-m4v
- Compression
- Lossy
- Both FLV and M4V are lossy formats, so repeated conversions can accumulate rounding artifacts. Keep this to only what you need and avoid repeated round-trips.
Questions about converting FLV to M4V
Is this FLV to M4V converter free?
Yes. Converting FLV to M4V here is free, with no account, no watermark and no daily quota. The work runs on your own device, so there is no server cost to pass on to you.
Is my FLV file uploaded anywhere?
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.
Is there a file-size limit for FLV to M4V?
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.
Does converting FLV to M4V lose quality?
M4V 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.
Can I convert several FLV files to M4V at once?
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.
Does FLV to M4V work on a phone, Mac or Chromebook?
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.
Convert other formats to M4V
21 formats can become M4V here.
Convert FLV to other formats
A FLV file can become any of these.
M4V to FLV
The reverse conversion
FLV to MP4
FLV to MP3
FLV to WAV
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