MP4 to AAC Converter

1. Upload your MP4 file (up to 500 MB).
2. Click 'Convert MP4 to AAC' — takes 5-30 seconds.
3. Download the AAC audio file.

MP4 videos usually contain AAC audio — extracting it can be done losslessly (no re-encoding). The output AAC file is byte-identical to the audio inside the video.

MP4 is a container — the audio inside is usually AAC. Extracting that audio gives you a standalone AAC file that plays on any device. Because the audio is already AAC, the extraction is lossless — no re-encoding, no quality loss, and no generational loss. This is the fastest and highest-quality way to save audio from a video.

The converter reads the MP4 container and extracts the AAC audio stream directly into an AAC file (or M4A container). No re-encoding happens — the audio is copied byte-for-byte. Output is a standard AAC audio file that plays on any device.

• Extracting audio from MP4 videos for music libraries.
• Saving audio from video podcasts.
• Ripping audio from YouTube MP4 downloads.
• Extracting audio for editing or re-mixing.
• Making audio-only versions of video content.
• Saving soundtracks from video files.
• Preparing audio for transcription services.

MP4 → AAC is lossless when the source MP4 has AAC audio — the extracted audio is byte-identical to the source. For MP4 files with MP3 or AC-3 audio, the output is re-encoded to AAC at high quality.

• Only the first audio track is extracted from multi-track MP4s.
• Video content is discarded.
• MP4 with AC-3 or DTS audio requires re-encoding (slower).
• DRM-protected MP4 files can't be converted.
• Output is AAC (M4A) — for MP3, use MP4 → MP3 instead.

• Output AAC (M4A) plays on every device and OS.
• Works with iTunes, Apple Music, VLC, phones, car stereos.
• Metadata and album art preserved.
• Standard AAC — no special software needed.
• Accepted by every audio platform.

• If the source MP4 has AAC audio, extraction is lossless.
• Only the first audio track is extracted.
• Output is M4A container with AAC codec — plays everywhere.
• For MP3 output, use MP4 → MP3 instead.
• Very large MP4 files may take 30+ seconds.

Only one audio track was extracted

Multi-track MP4s only extract the first audio track. Use a dedicated tool (e.g., ffmpeg) for multi-track extraction.

Audio quality is lower than expected

If the source MP4 has MP3 or AC-3 audio, extraction requires re-encoding. Quality is preserved at high bitrates.

Output is M4A not AAC

M4A is the container for AAC — same audio codec. Plays identically to a .aac file.

• Fraunhofer IIS — AAC
• MPEG — MP4 Specification