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Free tools › Audio and video

FLV to MP4

Videos saved from the Flash years, into a file that still plays.

This one runs on your credits. Videos saved from the Flash years, into a file that still plays.

Sign in and get 500 free credits every month — enough for many files — then drop the file in the workbench and run flv to mp4 there.

Pick a file below to see exactly what it would cost.

Sign in and run it — free credits included

More free conversions, where you upload. The Fylane extension does the same work inside any upload form, on its own free share every day.About the extension

How to convert FLV to MP4

  1. Drop the video.
  2. Nothing to choose.
  3. Press Convert and download the MP4.

What happens to your file

The video is decoded and re-encoded as H.264 with AAC sound in a fast-start MP4 — the one file phones, TVs, Windows, Macs and every browser play — at a quality most people cannot tell from the original.

Questions

Nothing opens my FLV any more — why?

Flash Player was retired in 2020 and players dropped the container with it. The video inside is usually plain H.264 or VP6; the MP4 gives it a wrapper everything reads.

Do this in code

curl -X POST https://api.fylane.dev/v1/jobs \
  -H "Authorization: Bearer $FYLANE_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "file_id": "<file id>",
    "operation": "video.convert",
    "options": {}
  }'

The same operation, video.convert — Anything playable becomes H.264+AAC in a faststart MP4 — or, by `container`, MOV, MKV, or VP9+Opus WebM. Upload first with the quickstart; every option is on the operations page. 500 free credits a month, then $5 per thousand.