Update obsolete Flash videos for modern web browsers. Every conversion runs locally on your Mac — your FLV files are never uploaded.
macOS 14 or later · Apple silicon · Free to try
FLV is the obsolete Flash video format. MP4 is the universal video format that plays on virtually every device. Update obsolete Flash videos for modern web browsers.
PrivateRemix handles the FLV-to-MP4 conversion in a couple of clicks, with the result saved right next to your original file.
Unlike free online converters, PrivateRemix has no server. Your FLV files stay on your Mac — no upload, no cloud, no account.
Drag a FLV file into PrivateRemix, or pick one from your Mac.
Select MP4 from the formats PrivateRemix offers for your file.
The new MP4 appears next to the original. Nothing leaves your Mac.
The change is minimal. Both formats are compressed, and PrivateRemix converts at a high quality setting so there is no visible or audible drop for everyday use.
Flash is discontinued and modern browsers can't play FLV. Converting to MP4 rescues old Flash videos for today's players.
For sharing and playback, yes — MP4 is supported by nearly every phone, TV, browser and editor, which is why it's the safe default.
No. PrivateRemix runs entirely on your Mac using its own processor. Your FLV files never leave the device — there is no server to upload to, and it works fully offline.
Yes. Drop in a batch of FLV files and PrivateRemix converts them all locally, saving each new MP4 next to its original.
Free to try. macOS 14 or later, Apple silicon.