FLV to MP4 Converter — Free Online, In Your Browser
FLV is the old Flash Video format — most modern phones and players won’t touch it. Convert your FLV files to MP4 (H.264 + AAC), the format that plays everywhere: phones, browsers, TVs, and social apps. The conversion runs entirely in your browser — no uploads, no watermarks, no sign-up.
FLV to MP4 Converter
Turn old Flash FLV videos into universal MP4 — free, private, in your browser.
100% Free Forever
No Sign-up
No Credit Card
Private — files never leave your browser
Unlimited Use
1 Add your FLV file
Drag & drop your FLV here
or click to browse — one video at a time
2 Quality settings
Lower CRF = better quality, bigger file. 23 is the sweet spot.
Uncheck to produce a silent video.
3 Convert & download
Working…
✅ Done — your MP4 video
How it works
- Step 1 — Drop in your FLV file. A video engine loads once in the background (~9 MB, then cached).
- Step 2 — Pick a quality preset or set CRF yourself; choose whether to keep the audio track.
- Step 3 — The video is re-encoded to H.264 + AAC MP4 locally with faststart (for web streaming) and downloads to your device.
Everyday uses
- Archivists — rescue old Flash-era downloads into a playable format.
- Creators — make legacy clips editable in modern video editors.
- Anyone — FLV won’t play on phones; MP4 plays everywhere.
Rule of thumb: CRF 23 gives transparent quality for most FLV sources — go to 18 only if the original is unusually sharp.
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