Will my AAC file play on iPhone, Android, and Windows?

Yes. AAC is the native format for all Apple devices, and Android phones have supported it for years. Windows Media Player (Windows 10+) and Groove Music also handle AAC. If you need the file in M4A format, just rename the extension or use a converter—M4A is AAC in a different wrapper.

How much smaller will my file be after conversion?

A 4-minute MP4 video (720p, stereo audio) is typically 40–80 MB. After extracting and encoding the audio as AAC at 192 kbps, you’ll get a file around 5.5–6 MB. The actual size depends on the bitrate you pick. Voice-only tracks can be even smaller if you use 128 kbps.

Does the tool keep or save my files?

No. Videozify runs entirely in your browser using WebAssembly. Your MP4 never leaves your device, and the AAC file is generated in memory and offered as a download. Nothing is uploaded or stored on any server.

Can I convert MP4 files with surround sound to AAC?

Yes, but the output will be stereo (2 channels). Most AAC players expect stereo audio. If your MP4 contains 5.1 or 7.1 surround, the converter will mix it down to stereo unless you use advanced settings. For most music and podcasts, this is fine.

Should I use AAC or MP3 for my audio?

AAC is more efficient than MP3, so you get the same quality at a lower bitrate. If you’re targeting Apple, video platforms, or streaming, AAC is the better choice. If you need maximum compatibility with ancient devices (pre-2010), MP3 might be safer.

Will subtitles or chapters be kept in the AAC file?

No. Subtitles, chapters, and video tracks are dropped during extraction. AAC files only store audio. If you want to keep subtitles, export them separately before converting.

Can I join several AAC files after conversion?

Yes, you can combine multiple AAC files using an audio joiner. Videozify offers a free audio joiner tool online. Just make sure all files use the same bitrate and sample rate for smooth joining.

Is AAC a lossless format?

No. AAC is a lossy audio format, like MP3, designed for efficient storage and streaming. If you want a lossless copy, use WAV, FLAC, or ALAC. For most listening, AAC at 192 kbps is transparent to the ear.

MP4 → AAC

MP4 to AAC Converter

Drop a file here

Click to browse, or paste a file from the clipboard.

Choose file

An MP4 to AAC converter extracts the audio track from an MP4 video and saves it as a standalone AAC file. Videozify runs this conversion in your browser, so your file is never uploaded. You can pick the bitrate (default is 192 kbps). The result is a pure audio file that plays on phones, car stereos, and most apps that support AAC.

How to convert MP4 to AAC

Drop your MP4 file above or click Browse to pick it from your device.
Choose the AAC bitrate you want. For most music or voice, 192 kbps is a safe default.
Click Convert and wait for the progress bar to finish.
Download your AAC audio file. The video is discarded, and nothing leaves your device.

Why convert MP4 to AAC?

MP4 files often come from phones, cameras, Zoom, or screen recordings. These files bundle video and audio, but sometimes you only need the audio—for podcast editing, ringtones, language study, or music playlists. AAC is a modern, efficient audio format built for the same kind of use as MP3 but with better quality at lower bitrates.

AAC is the default audio format for Apple devices, video platforms, and many streaming platforms. It plays natively on iPhone, iPad, Android, Windows 10+, Mac, and most smart speakers. If you want to take the audio from a video and use it in a music app, car stereo, or as a podcast episode, converting to AAC is usually the best choice.

Compared to MP3, AAC is more efficient. At 192 kbps, most listeners can’t hear a difference from the original. For a 4-minute stereo track, expect the AAC file to be about 5.5–6 MB. The original MP4 might be 40–80 MB for the same length, since that includes video. Extracting just the audio can shrink the file to under a tenth of its original size.

You should not convert to AAC if you need a lossless file for editing or archival, or if you plan to edit the audio repeatedly (each export can lose a bit more detail). For voice memos, music playback, or sharing, AAC is a solid, widely supported option.

Need to trim your audio after conversion? Use the audio trimmer. If you want to combine several AAC tracks, try the audio joiner.

MP4 vs AAC: what's the difference?

Property	MP4	AAC
Extension	.mp4	.aac
Type	Audio+video container	Audio codec/file
Typical size (4 min)	40–80 MB (video+audio)	5–6 MB (192 kbps audio)
Compression	Depends on video/audio codecs inside	Lossy, efficient (MPEG-4 AAC LC)
Quality	Up to 4K video, 16–24-bit audio	Transparent at 128–256 kbps for most music
Device support	Phones, computers, TVs, web	iOS, Android, Windows, Mac, most car stereos

MP4 is a container file that holds video and audio together. AAC is a compressed audio format that plays on most modern devices and streaming platforms.

Does converting MP4 to AAC lose audio quality?

Yes, but the loss is usually minor if you pick a high enough bitrate. AAC is a lossy format like MP3, but more efficient. For voice or music, 128–256 kbps is the common range—192 kbps is a good default. If the audio in the MP4 is already AAC, the tool will re-encode to your chosen bitrate, which could cause a slight quality drop. If you want to keep every detail, save to a lossless format instead.

Lower bitrates (like 96 kbps) will make files even smaller but can sound muffled, especially for music. Higher bitrates (256 kbps or more) are overkill for most podcasts, voice memos, or phone recordings, but can be worth it for high-quality music. You can always try a short sample at different rates to hear the difference.

Are there built-in alternatives for MP4 to AAC conversion?

Yes, but with limits. VLC Media Player can extract audio and save as AAC, but the interface is clunky and you have to adjust output options manually. Audacity can import MP4 and export audio, but AAC export may require extra plugins or codecs, and the process is slower. On macOS, QuickTime Player lets you export audio only as M4A (which is AAC inside another wrapper)—not raw AAC. Windows Photos, Clipchamp, and most Android/iOS gallery apps do not export AAC audio directly. Videozify keeps it in the browser, with no plugins or uploads.

If your goal is a ringtone for iPhone, you’ll need to convert to M4R format after making AAC. For podcasts, most platforms accept both MP3 and AAC files. For music playback on old devices, check if AAC is supported—anything from the last 10 years usually is.

Frequently asked questions

Will my AAC file play on iPhone, Android, and Windows?: Yes. AAC is the native format for all Apple devices, and Android phones have supported it for years. Windows Media Player (Windows 10+) and Groove Music also handle AAC. If you need the file in M4A format, just rename the extension or use a converter—M4A is AAC in a different wrapper.
How much smaller will my file be after conversion?: A 4-minute MP4 video (720p, stereo audio) is typically 40–80 MB. After extracting and encoding the audio as AAC at 192 kbps, you’ll get a file around 5.5–6 MB. The actual size depends on the bitrate you pick. Voice-only tracks can be even smaller if you use 128 kbps.
Does the tool keep or save my files?: No. Videozify runs entirely in your browser using WebAssembly. Your MP4 never leaves your device, and the AAC file is generated in memory and offered as a download. Nothing is uploaded or stored on any server.
Can I convert MP4 files with surround sound to AAC?: Yes, but the output will be stereo (2 channels). Most AAC players expect stereo audio. If your MP4 contains 5.1 or 7.1 surround, the converter will mix it down to stereo unless you use advanced settings. For most music and podcasts, this is fine.
Should I use AAC or MP3 for my audio?: AAC is more efficient than MP3, so you get the same quality at a lower bitrate. If you’re targeting Apple, video platforms, or streaming, AAC is the better choice. If you need maximum compatibility with ancient devices (pre-2010), MP3 might be safer.
Will subtitles or chapters be kept in the AAC file?: No. Subtitles, chapters, and video tracks are dropped during extraction. AAC files only store audio. If you want to keep subtitles, export them separately before converting.
Can I join several AAC files after conversion?: Yes, you can combine multiple AAC files using an audio joiner. Videozify offers a free audio joiner tool online. Just make sure all files use the same bitrate and sample rate for smooth joining.
Is AAC a lossless format?: No. AAC is a lossy audio format, like MP3, designed for efficient storage and streaming. If you want a lossless copy, use WAV, FLAC, or ALAC. For most listening, AAC at 192 kbps is transparent to the ear.