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M4A to MP4 Converter — Free, Online, No Upload

Wrap your iPhone voice memo, GarageBand project, or Apple M4A audio in a proper video file for YouTube and social media.

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

Tap to select M4A files

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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
Need the reverse?MP4 → M4A

How to convert M4A to MP4 online

  1. 1

    Drop your M4A file

    Drag your MPEG-4 Audio 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 MP4

    Click Download to save the MPEG-4 Part 14 file.

M4A vs MP4: format overview

M4A

MPEG-4 Audio

Apple / MPEG Group · 2001

Compression
lossy
Transparency
No
  • ✓ Better quality than MP3 at same bitrate (AAC codec)
  • ✓ Native Apple ecosystem support
  • ✗ Not universally supported on all Windows/Linux players
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

M4A magic bytes: 00 00 00 xx 66 74 79 70 4D 34 41

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

Why convert M4A to MP4?

M4A is Apple's audio format — used for iPhone voice memos, GarageBand exports, Apple Podcast downloads, and iTunes music. The format is excellent for audio, but useless for video platforms that require a video file to exist.

YouTube, TikTok, Instagram, and Facebook all require video uploads. They don't accept raw audio files. If you have an M4A from any of these sources and want to post it as video content, you need to wrap it in an MP4 container with a video track.

Converting M4A to MP4 creates a 1280×720 video with a dark gradient background and your original audio. For YouTube specifically, this is the standard approach used by podcasters, musicians, and meditation teachers to publish long-form audio on the platform. YouTube processes and hosts the resulting MP4 normally, and viewers play it like any other video — the "video" is just a still background behind the audio.

M4A files are stored in the MPEG-4 container (same as MP4) with AAC audio. Our converter re-muxes the audio into a new MP4 container with an added video track. Processing is fast because the audio doesn't need to be re-encoded in many cases — only the video track (a single still frame) needs to be created.

Quality & file size: M4A to MP4

Typical sizes: M4A 3–6 MB (3-minute song); MP4 100–300 MB (1 minute 1080p).

Frequently asked questions

What are M4A files and where do they come from?
M4A is the file extension Apple uses for audio-only MPEG-4 files with AAC encoding. Common sources: iPhone Voice Memos app (voice recordings), GarageBand exports, Apple Podcasts downloads, screen recordings on Mac (audio track only), and music downloaded via Apple Music. M4A is functionally the same as AAC audio in an MP4 container — just saved with an audio-only extension.
Is M4A to MP4 conversion lossless for the audio?
In most cases, yes — M4A audio is already AAC, which is the same codec used in MP4. Our converter copies the audio stream directly without re-encoding in compatible cases, preserving perfect audio quality. The only addition is the video track (still background image). If re-encoding is required due to codec compatibility, we use AAC at 192 kbps — the same quality level.

Your M4A file never leaves this tab — FormatDrop has no endpoint that receives file data. How it works