FLV to AU converter
A free FLV to AU 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
AU is already selected. Open the gear icon on any row if you want to change quality, dimensions or codec before converting.
- 03
Download your AU
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
AU
Sun AudioThe Unix system-sound format from Sun Microsystems, usually holding 8-bit mu-law audio. Historically important, practically obsolete.
- Developed by
- Sun Microsystems
- Released
- 1992
- Extension
- .au, .snd
- MIME type
- audio/basic
- Compression
- Lossy or lossless
- FLV is already lossy, and while AU can be saved either way, this conversion cannot restore discarded details. Saving it lossless here preserves what is already present instead of discarding more.
- Only the audio track survives this conversion — the picture is discarded entirely.
Questions about converting FLV to AU
Is this FLV to AU converter free?
Yes. Converting FLV to AU 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 AU?
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 AU lose quality?
It depends on your selected settings and codec path. Many engines can write either lossy or lossless output for AU, so you can usually increase quality if this file is your final version.
Can I convert several FLV files to AU 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 AU 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 AU
41 formats can become AU here.
Convert FLV to other formats
A FLV file can become any of these.