18 Best MP4 to AAC Converters in 2026 (Free and Paid)

MP4 to AAC is the conversion you do when you need just the audio from a video file in its native compressed form. MP4 typically contains AAC audio inside; extracting it as raw .aac (ADTS stream) means no re-encoding and bit-identical quality. The conversion is essentially a stream copy. Useful for: feeding audio into HLS streaming pipelines, archiving the audio track separately, building podcast feeds, or just pulling music tracks out of music video MP4s. This guide compares 18 MP4 to AAC converters in 2026.

How to Convert is listed first because it is made by the same indie developer who writes this blog. The cleanest MP4 → AAC tools simply copy the audio stream out without re-encoding — instant and lossless.

Stream Copy Is the Right Default

ffmpeg -i input.mp4 -vn -c:a copy output.aac

-vn drops video; -c:a copy copies the audio stream without re-encoding. The output AAC is byte-identical to what the MP4 carried.

If you need .m4a (AAC in MP4 container) instead of raw .aac:

ffmpeg -i input.mp4 -vn -c:a copy output.m4a

Quick Picks for MP4 → AAC

• Best CLI: FFmpeg with stream copy.
• Best GUI: fre:ac.
• Mac: afconvert or QuickTime export as Audio Only.
• One-shot: How to Convert.

One-shot: MP4 to AAC converter.

1. How to Convert

Drop MP4s in, pick AAC, hit convert. Stream copy by default — instant, lossless.

Pricing

• One-time license; free trial.

2. FFmpeg

See above. Batch:

for f in *.mp4; do ffmpeg -i "$f" -vn -c:a copy "${f%.mp4}.aac"; done

Pricing

• Free, open source.

3. macOS QuickTime + afconvert

QuickTime: File → Export As → Audio Only (M4A). For raw .aac, use afconvert.

Pricing

• Free with macOS.

4. fre:ac

Cross-platform batch tool.

Pricing

• Free, open source.

5. VLC

Media → Convert / Save → AAC.

Pricing

• Free, open source.

6. Shutter Encoder

FFmpeg GUI.

Pricing

• Free.

7. HandBrake

Audio-only mode supports AAC pass-through.

Pricing

• Free, open source.

8. XLD (Mac)

Mac batch converter.

Pricing

• Free.

9. Audacity

File → Export → AAC. Re-encodes; not stream copy. Useful for editing during the extraction.

Pricing

• Free, open source.

10. Permute (Mac)

Mac-native converter.

Pricing

• One-time purchase.

11. MediaHuman Audio Converter

Drag-and-drop batch tool.

Pricing

• Free.

12. Foobar2000 (Windows)

Audiophile Windows tool with audio extraction.

Pricing

• Free.

13. Switch Audio Converter (NCH)

Lightweight commercial converter.

Pricing

• Free home; paid commercial.

14. CloudConvert

Web MP4 → AAC.

Pricing

• Free tier; paid above.

15. Convertio

Web MP4 → AAC.

Pricing

• Free with caps; paid above.

16. Online Audio Converter (123apps)

Browser-based.

Pricing

• Free with limits; paid above.

17. FreeConvert

Web converter.

Pricing

• Free with caps; paid above.

18. Zamzar

Long-running web converter.

Pricing

• Free with daily limits; paid above.

How to Choose

• Bit-identical extraction: FFmpeg -c:a copy or How to Convert.
• For streaming pipelines: FFmpeg with explicit ADTS.
• Mac: QuickTime or afconvert.
• Batch: FFmpeg in a script.

Final Thoughts

MP4 → AAC is the cleanest audio extraction in this guide because the MP4 already contains AAC. Stream copy means no quality loss and instant conversion. FFmpeg is the cleanest tool; the GUI options all wrap the same underlying decode. Avoid web tools for large or sensitive video — local extraction takes seconds.