Free · No signup · Files deleted after 1h

FLV to MP4
Converter

Convert old Flash FLV video to MP4 online — free, no signup, no watermarks. Bring archived clips and downloads into a format that plays on every modern device.

Convert FLV to MP4 free →

No account needed · Up to 25 MB free · Files permanently deleted after 1 hour

Plays everywhere
Flash is dead and FLV files no longer play in browsers or on phones. MP4 (H.264) plays natively on every device, browser and platform made in the last decade.
Rescue old archives
FLV was the format of the Flash video era. Converting to MP4 makes downloaded lectures, screencasts and archived clips usable again in today's players and editors.
Private & secure
Your video files are uploaded over HTTPS, processed on EU servers, never shared with third parties, and permanently deleted one hour after conversion.

How it works

1
Upload your FLV
Drag and drop your .flv file, or click to browse. Free tier supports up to 25 MB per file.
2
Select MP4 output
MP4 is selected by default. You can also choose MOV or WEBM from the format picker.
3
Download instantly
Your MP4 is ready in moments. Click Download — the link is valid for 15 minutes.

Common questions

Why won't my FLV file play anymore?

FLV (Flash Video) was designed for the Adobe Flash Player, which browsers removed at the end of 2020. Modern browsers, phones and video apps have no built-in FLV support, so the file simply won't open. Converting to MP4 — supported natively everywhere — fixes that in one step.

Will converting reduce the quality?

FLV usually already contains an H.264 stream, in which case we can repackage it into MP4 with little to no quality change. If it uses an older codec, the video is re-encoded to H.264 at a high-quality setting that looks visually equivalent to the source.

Can I extract just the audio from an FLV?

Yes — choose MP3 (or another audio format) as the output to pull the soundtrack out of the FLV as an audio-only file.

Is there a file size limit?

Free users can convert FLV files up to 25 MB without an account, or up to 10 conversions per day with a free account. Pro users get 500 MB per file and 3,000 credits a month. Business users get up to 5 GB.

Related converters
WMV → MP4 AVI → MP4 MOV → MP4 MKV → MP4