MP4 to FLAC
Pull the audio track out of an MP4 and re-encode it as FLAC, a lossless compressed audio format. The video stream is discarded — this is the right tool when you want the cleanest possible audio extraction for archival or further editing. Heads-up: MP4 audio is almost always AAC, which is lossy, so the FLAC will faithfully preserve the decoded audio but it can't recover information the original AAC encode threw away — you don't get true lossless from a lossy source. The conversion runs entirely in your browser via ffmpeg.wasm; nothing is uploaded. FLAC files are noticeably larger than MP3 or AAC but smaller than WAV.
Drop .mp4 file here
or click to choose
Privacy
Runs entirely in your browser — nothing is sent to any server.
Cost
Free. No sign-up, no watermark.
Supports
.mp4 → .flac
Related tools
Tools that work with the same formats — most users open one of these next.
Video Trimmer
Cut a clip from a video file — MP4, WEBM, MKV, MOV, AVI — in your browser.
Compress Video
Shrink a video file by re-encoding to H.264 with a quality preset — free, in-browser.
MP4 to WebM
Convert MP4 video to WebM (VP9 + Opus) — free, runs entirely in your browser.
MP4 to MKV
Remux MP4 to Matroska (MKV) — fast, lossless, no re-encoding.
MP4 to MOV
Convert MP4 video to MOV (QuickTime) — free online, no upload.
MP4 to GIF
Convert MP4 video to an animated GIF — free online, with a tuned palette.
Frequently asked
Is MP4 to FLAC free to use?
Yes. MP4 to FLAC is completely free with no sign-up, no watermark, and no usage limits. Toolsly does not charge for any of its tools.
Do my files and data stay private?
Yes — MP4 to FLAC runs entirely in your browser using your device's CPU. Files and text are never uploaded to our servers, so your data stays private.
How does MP4 to FLAC work?
Open MP4 to FLAC, drop in your MP4 file, choose any options, and click Convert. Your browser does the work locally and produces a FLAC file you can save right away.
What's the maximum file size for MP4 to FLAC?
Because MP4 to FLAC runs in your browser, the maximum size depends on your device's available memory. Most modern phones and laptops handle files up to a few hundred MB without issues.