Skip to main content
FormatDrop
Home›Audio›MP4 to AAC
MP4
→
AAC

MP4 to AAC Converter — Free, Online, No Upload

Extract the soundtrack from any MP4 in seconds — AAC is already inside, so no re-encoding needed.

Free · no signup2 free files a day100% in-browser · no upload

Tap to select MP4 files

or click to browse

2 free files per day (2 left today) · Up to 10 MB each · Upgrade for more

✓ Files never uploaded✓ 100% browser-based✓ No account required

How to convert MP4 to AAC online

  1. 1

    Drop your MP4 file

    Drag your MPEG-4 Part 14 file onto the box above, or click it to pick a file.

  2. 2

    Wait a few seconds

    Conversion starts on its own and runs on your device, not on a server.

  3. 3

    Download your AAC

    Click Download to save the Advanced Audio Coding file.

MP4 vs AAC: format overview

MP4

MPEG-4 Part 14

Moving Picture Experts Group · 2001

Compression
lossy
Transparency
No
  • ✓ Universal compatibility across all platforms
  • ✓ Excellent compression with H.264/H.265
  • ✗ H.264 has royalty implications
AAC

Advanced Audio Coding

Dolby, Fraunhofer, Sony, Nokia · 1997

Compression
lossy
Transparency
No
  • ✓ Successor to MP3 — better quality at same bitrate
  • ✓ Native support across Apple, Android, YouTube

MP4 magic bytes: 00 00 00 xx 66 74 79 70

AAC magic bytes: FF F1 (ADTS) / 00 00 00 xx 66 74 79 70

Why convert MP4 to AAC?

You recorded a lecture, podcast interview, or live stream as an MP4 video, but all you actually need is the audio. Watching a video just to listen wastes bandwidth, battery, and storage — and many podcast apps, streaming platforms, and audio players won't accept video files at all. The audio track has been sitting inside your MP4 the whole time; this converter pulls it out.

AAC is the right target for this workflow. It's the default audio codec inside every MP4 from iPhone, Android, GoPro, and most cameras — meaning extraction is usually direct and lossless: the existing AAC stream is simply unwrapped from the video container and saved as a standalone file. No re-encoding occurs, and audio quality is identical to what was inside the video. AAC plays natively on every Apple device, Android phone, and modern streaming platform.

The resulting file is typically 5–10× smaller than the MP4. A 1-hour MP4 lecture at 256 kbps AAC audio might be 500 MB total — the extracted AAC will be around 115 MB. It works immediately in iTunes, Apple Music, GarageBand, Audacity, Adobe Audition, and any podcast host that accepts AAC or M4A.

Quality & file size: MP4 to AAC

Typical sizes: MP4 100–300 MB (1 minute 1080p); AAC 2–5 MB (3-minute song).

AAC output is encoded at 192 kbps.

Re-encoding one lossy format into another adds a second round of compression.

Frequently asked questions

Does extracting AAC from MP4 cause any quality loss?
No — MP4 videos almost always contain an AAC audio track. Our converter extracts it directly without re-encoding, preserving the original audio quality exactly.
Can I use the extracted AAC in editing software?
Yes — raw AAC files work in Adobe Audition, DaVinci Resolve, and most professional audio and video editors. Rename to .m4a if your software prefers that extension.

Your MP4 file never leaves this tab — FormatDrop has no endpoint that receives file data. How it works