Convert MP4 to FLAC
Convert MP4 to FLAC on your device. Extract audio without uploading the video.
Drop the mp4 video
Drag the MP4 file in. Your browser reads it locally - its contents stay on your device.
Pick FLAC
The audio track is extracted and encoded as FLAC right here.
Download the audio
Your FLAC saves to your device, ready for any player.
Why convert here, not there
No upload, ever
Cloud extractors copy your video to their servers. This one pulls the flac out locally.
Local conversion
Skip the upload-wait-download cycle. The flac is ready in seconds.
No account, no daily cap
Free for any number of videos, from a phone clip to a full recording.
The two formats, briefly
| MP4 | MP4 is a container. This converter writes H.264 video and AAC audio when an audio track is present; target-player support still needs checking. | |
|---|---|---|
| FLAC | FLAC uses lossless audio compression. Encoding decoded audio as FLAC does not restore detail already lost in a source recording. | |
When you need this
- Extract the soundtrack from a MP4 video for an audio-only workflow that accepts FLAC. This does not keep the picture. A video with no audio track cannot produce meaningful audio.
MP4 vs FLAC: what changes
| MP4 | FLAC | |
|---|---|---|
| Kind | Video | Audio |
| Compression | Depends on source encoding | Lossless audio compression |
| Typical size | Depends on the file and encoding settings. | Measure the exported file; it may be larger. |
| Opens on | Check the source in your app and browser. | Check the downloaded file in the receiving app. |
| Best for | Keep the original as your source. | FLAC workflows, subject to the limits below. |
Keep the original. Compare the exported file before sharing or replacing it.
Tested on this tool
On 3 November 2026 we ran a synthetic test file through this converter: an 8-second, 640x480 MP4 (850 KB) with H.264 video and an AAC audio track. The output was a 386 KB FLAC - audio only, 44.1 kHz, 8.01 seconds - and the downloaded file decoded cleanly when we checked it.
- The FLAC holds exactly what the MP4's audio track contained. The source audio was AAC, which is lossy, so this FLAC preserves that sound; it does not recover detail the AAC already lost.
- The picture is dropped. This is an audio extraction, not a video conversion.
One small synthetic file is not every MP4. A video with lossless source audio (some screen recorders) will produce a larger FLAC than this test did.
Good to know
- FLAC uses lossless compression of decoded audio. There is no bitrate choice, and lossy source detail cannot be recovered.
- First use downloads the audio/video engine (about 30 MB). The input cap is 2 GB, but available browser memory can run out below that.