Step 1: Supply your MP4 files using the button above or by haul and lay.
Step 2: Click the 'Convert' button to start the conversion.
Step 3: Get your converted AIFF files.
MP4 to AIFF Conversion FAQ
How do I extract the audio from a MP4 as AIFF?
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Upload the MP4 file and the converter demuxes the audio track, then re-encodes it as AIFF. No re-encoding of the video happens — only the audio stream is processed, which keeps it fast even on long videos.
Will the audio quality match the original MP4 track?
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Yes — the audio is extracted at the source bitrate where possible. If you pick a higher AIFF bitrate than the source, the file will not improve in quality, just grow in size.
Is the MP4 to AIFF conversion reversible?
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You can convert the AIFF back to MP4 on this site. If either format involved is lossy, the round-trip is not bit-perfect even though it is visually or audibly close.
Will the AIFF be larger than the MP4?
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Yes — lossless containers store every byte. Expect the AIFF to be 3-8x the size of the MP4. The benefit is no further quality loss on editing or re-encoding.
Does converting MP4 to AIFF improve the audio quality?
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No, and it is worth being blunt: nothing can. The MP4 already discarded detail during its original encode, and wrapping what remains in a lossless AIFF preserves exactly that — no more. The file gets several times larger and sounds identical. It is still the right move before editing, because AIFF will not add a second generation of artefacts when you export. AIFF is the studio interchange format on macOS, handles metadata better than plain WAV, and imports into Logic and Pro Tools instantly. MP4 only supports one widely-honoured subtitle format (mov_text), and multi-track audio is unreliable outside desktop players.
Can I tag the AIFF with artist and album information?
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Yes, and it is a genuine gain over MP4, which has nowhere dependable to store any of it. AIFF carries title, artist, album, year, track number and embedded cover art in the container itself, so a music library files it correctly without a manual pass.
Will the AIFF play in my car or on older hardware?
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Often not. MP4 is decoded by essentially everything, including car head units and elderly players; AIFF needs software that knows the codec, which standalone hardware frequently does not have. If the destination is a car stereo or a portable player, that is a strong argument for staying on MP4. AIFF is as large as WAV with worse support outside the Apple world, so it is a poor choice for distribution.
Is there a file-size limit when converting MP4 to AIFF?
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Anonymous uploads are capped at a generous default; signed-in free accounts get a higher cap, and Pro accounts have no per-file limit. Browser memory is usually the practical constraint long before our server-side limits kick in.
Can I batch-convert several MP4 files to AIFF at once?
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Yes. Drop or pick multiple MP4 files in one upload — the converter processes them in parallel and returns a ZIP of the AIFF results. There is no need to repeat the upload step per file.
What happens to my MP4 files after the conversion?
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Uploaded files and AIFF outputs are auto-deleted after a short retention window. We do not inspect, share, or train on user files. Direct download links are time-limited and tied to your session.
What apps can play a AIFF file?
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AIFF plays in most music players, browsers, and media libraries. iTunes / Apple Music, VLC, Foobar2000, and phone media apps handle it natively.
Do I need to install software to convert MP4 to AIFF?
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No. The converter runs entirely in your browser plus our cloud — no plugin, no install, no admin rights. It works on Windows, macOS, Linux, ChromeOS, iOS, and Android.
