Step 1: Transfer your MP4 files using the button above or by slide and deposit.
Step 2: Click the 'Convert' button to start the conversion.
Step 3: Retrieve your converted AIFF files.
MP4 to AIFF Conversion FAQ
How do I extract the audio from my MP4 file as AIFF?
+
Upload the MP4 file and the converter demuxes the audio stream, then transcodes it to AIFF. There is no second video pass — the visual track is discarded immediately so extraction is much faster than a full re-encode. MP4 is ISO/IEC 14496-14, standardised in 2001 and derived from the same QuickTime box layout MOV uses. AIFF is Apple’s Audio Interchange File Format from 1988, built on the same IFF chunk design as AVI’s RIFF.
Does converting MP4 to AIFF improve the audio quality?
+
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?
+
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?
+
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.
What audio bitrate does the extracted AIFF use?
+
Default bitrate for lossy AIFF is 192 kbps, which is transparent for music. You can override to 320 kbps (audiophile) or 96-128 kbps (voice / podcast / smaller file). The bitrate dropdown is exposed in the advanced options before you click convert.
Will I lose audio quality going from MP4 to AIFF?
+
If AIFF is lossless (WAV, FLAC), every sample is preserved exactly. If AIFF is lossy (MP3, AAC, OGG, Opus), the AIFF codec recompresses the source audio — at 192 kbps the result is transparent for almost all content. Going lossy → lossless never recovers detail already discarded. AIFF stores uncompressed big-endian PCM — the Apple-side equivalent of WAV, with the same bit-for-bit fidelity.
Does the AIFF audio keep the original sample rate?
+
By default yes — 48 kHz audio in your MP4 stays 48 kHz in the AIFF output. For CD-burning or legacy player compatibility you can downsample to 44.1 kHz via the sample-rate dropdown; the resampler is high-quality SoX-grade.
Can I extract audio from multiple MP4 files to AIFF in one batch?
+
Yes — drop a folder of MP4 files and we extract audio in parallel. Premium users get more parallel workers; on a 50-file batch this is the difference between a couple of minutes and ten-plus minutes.
Will the AIFF be tagged with title / artist / album metadata?
+
If the MP4 carries chapter or stream metadata, we copy title / artist / album fields into the AIFF container. If not, the AIFF comes out untagged — use a tag editor (Mp3tag, Picard) post-export for richer tagging.
How long does extracting AIFF audio from a 1-hour MP4 take?
+
Audio demux + encode is fast — typically 5 to 15% of the source duration. A 1-hour MP4 → AIFF finishes in roughly 3 to 9 minutes on the standard pipeline; Premium parallelism cuts this further for batch jobs.
Can I extract just a section of the MP4 audio as AIFF?
+
Not in this tool directly — extract the full audio as AIFF, then use /audio-trim/ or /audio-cutter/ to clip the section. The two-step path is usually faster than a combined operation and gives you precise waveform-level control.
Is my MP4 file private during the audio extraction?
+
Yes — same privacy model as every conversion: isolated workers, no human review, automatic deletion within minutes of completion. The detailed retention window is on /privacy/.
