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FLAC to MP4

Turn a FLAC track into an MP4 video with a picture, ready to upload. Processing stays on your device.

Files stay on your device

Drop a FLAC

Then add a picture or a color, and bars that move with the sound if you like. Nothing is uploaded.

MP3, M4A, WAV, FLAC, and other audio, or a video with sound.

How to convert FLAC to MP4 online

Open a FLAC, add the album cover or pick a background color, and save an MP4 that plays the track over it. FLAC is decoded and encoded as AAC in your browser, so the file is never uploaded.

  1. Step 1

    Choose your FLAC
    Pick a file or drop it into the converter above.

  2. Step 2

    Add a picture
    Add an image or pick a background color.

  3. Step 3

    Download the MP4
    Save the video when it finishes.

What to expect

Supported inputs
FLAC files, and any other audio or video with sound this browser can read. Pictures can be PNG, JPEG, or WebP.
What happens
The sound plays over a still picture for its full length. FLAC audio is encoded as AAC (MP3 where the browser has no AAC encoder); AAC audio is copied as it is.
Limits
One sound file at a time. The picture stays the same for the whole video; use Add audio to video to put a song under moving footage.

Private by design

Your video stays on your device

Mastershot processes your file locally in this browser. It does not need to be uploaded to a server, and you do not need an account to use the tool.

  • No upload
  • No signup
  • No watermark

Questions

No. Sites like YouTube re-encode the audio anyway, so the MP4 uses AAC at 192 kb/s, which is close to transparent.

Save the cover as a PNG or JPEG and add it as the picture. It keeps its shape, or sits on your background color in the frame you pick.

A few FLAC files use settings this browser can't decode. The page says so when it opens the file.

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