Convert Free Lossless Audio Codec (.flac) to MPEG-4 Part 14 (.mp4) online for free. Fast, secure audio conversion with no watermarks or registration.
Upload your .flac file by dragging it into the upload area or clicking to browse.
Choose your output settings. The default settings work great for most files.
Click Convert and download your .mp4 file when it's ready.
MP4 (MPEG-4 Part 14) is the most universally supported multimedia container in the world. While typically associated with video, MP4 can store audio-only content using AAC or ALAC codecs. Converting FLAC to MP4 means encoding the lossless audio into AAC (or ALAC) inside an MP4 container, producing a file that plays on virtually every device, browser, and operating system manufactured in the last 15 years. The result is functionally identical to an M4A file (M4A is just MP4 with a different extension).
MP4 is the universal format. Every smartphone, tablet, computer, smart TV, game console, car infotainment system, and web browser supports MP4 playback. Converting FLAC to MP4/AAC produces files that work everywhere without exception. For web embedding, MP4 audio is the safest format for HTML5 audio elements across Chrome, Firefox, Safari, and Edge. Some content management systems and media platforms only accept MP4 containers.
FFmpeg decodes FLAC to PCM and encodes using AAC-LC at the specified bitrate (default 256 kbps VBR) into an MP4 container. The MP4 container (ISO 14496-14) stores metadata in 'moov' atoms, enabling fast seek and random access. The output file is functionally identical to M4A — Apple simply uses the .m4a extension for audio-only MP4 files. For streaming use, faststart (moov atom at the beginning) is enabled by default.
AAC at 256 kbps in MP4 provides near-transparent audio quality. At 128 kbps, quality remains very good for general listening. The MP4 container introduces no quality overhead — it is purely a wrapper. Since FLAC is lossless, this represents a single generation of lossy encoding.
| Device | FLAC | MP4 |
|---|---|---|
| Windows PC | Partial | Native |
| macOS | Partial | Native |
| iPhone/iPad | Partial | Native |
| Android | Native | Native |
| Linux | Partial | Native |
| Web Browser | No |
Resolution: N/A
Bitrate: 320 kbps
OGG Vorbis preferred
Resolution: N/A
Bitrate: 256 kbps
AAC format required
Resolution: N/A
Bitrate: 128 kbps
Lossless FLAC/WAV for best quality
Resolution: N/A
Bitrate: 128 kbps
MP3 mono for spoken word
FLAC to MP4 produces the most universally compatible audio file possible. It is functionally equivalent to FLAC to M4A, with the MP4 extension ensuring recognition by every media system in existence.
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| Native |
| Funktion | FLAC | MP4 |
|---|---|---|
| Fullstandigt namn | Free Lossless Audio Codec | MPEG-4 Part 14 |
| Filandelse | .flac | .mp4 |
| Bast for | Lossless compression | Universal compatibility |