Convert your .aac files to .aiff format online for free. No software to install. Fast, secure, and easy.
Pro account required for audio & video
Drag and drop your .aac file or click to browse.
Select AIFF as your output format.
Click Convert and download your .aiff file.
While converting AAC to AIFF will not recover audio data lost during the original compression, it creates a lossless container that prevents further degradation. This can be useful for archival or when your workflow requires lossless input files.
AAC (Advanced Audio Coding, introduced in 1997) uses Lossy (MDCT-based with TNS and PNS tools) compression. AIFF (Audio Interchange File Format, introduced in 1988) uses None (PCM); AIFF-C supports compressed variants compression. AAC browser support: Universal. AIFF browser support: Limited (Safari; partial support in Chrome and Firefox).
Converting from AAC (lossy) to AIFF (lossless) will not recover quality that was lost during the original AAC compression. The conversion preserves the current state of the file without further degradation. The resulting AIFF file will be larger than the AAC original.
Typical AAC file size: A 4-minute song at 256 kbps AAC-LC: ~7.3 MB. Typical AIFF file size: A 4-minute song at 44.1 kHz/16-bit stereo: ~40 MB. The AIFF output will be larger than the AAC input because lossless compression cannot match the compression ratios of lossy formats.
For the best conversion results, always start from the highest quality source file available. Converting from a previously compressed file compounds any existing compression artifacts. When in doubt, use higher quality settings — you can always re-convert at lower quality later, but you cannot recover quality that has been lost.
Convert AAC to AIFF with 3 free conversions per day. No hidden fees.
Create a free account in 10 seconds and start converting immediately. No credit card required.
Files are encrypted during transfer, processed on secure servers, and deleted immediately after conversion.
Convert files from any device — desktop, tablet, or phone. No software to install, works in any modern browser.
SquishConvert supports over 358 file conversion combinations across images, documents, audio, and video.
Your converted .aiff file maintains the best possible quality. No unnecessary compression or quality loss.
Audio conversion requires a Pro account. See pricing — starting at $4.99/month
You get 3 free conversions per day. Audio conversions require a Pro account.
Most files convert in under 10 seconds. Larger files may take a bit longer depending on size.
Yes. Files are encrypted during transfer, processed on secure servers, and deleted immediately after conversion. We never store your files.
Currently, SquishConvert converts one file at a time. Batch conversion is coming soon — stay tuned!
Free users can convert files up to 10 MB. Pro users can convert files up to 500 MB.