Convert AIFF to SPX Online

Convert AIFF to SPX - Complete Guide

Converting AIFF to SPX stays in the audio file family but changes the traits that decide size, quality, transparency, editability, or device support. AIFF is a audio format. Apple lossless. SPX is a audio format. Speex audio. Below is what actually changes in a AIFF→SPX conversion, what is preserved, and when SPX is the better choice than keeping AIFF.

What changes when you convert AIFF to SPX

• SPX uses lossy compression, so the converter re-encodes the file and drops some fine detail to reduce size. At high quality the difference is hard to notice, but it cannot be undone.
• The audio is re-encoded into the SPX format. Because re-encoding is not free, start from the highest-quality source you have and keep quality settings high.
• Expect a smaller output file: SPX is typically more space-efficient than AIFF for the same content.

About the AIFF format

AIFF (Audio Interchange File Format) is Apple's uncompressed audio format, similar to WAV. It offers lossless audio quality for professional applications.

• Full name: Audio Interchange File Format
• Developer: Apple
• Compression: None (uncompressed)
• Opens with: Logic Pro, GarageBand, most players

Where AIFF is strong: uncompressed, studio-quality audio on Apple platforms; no generation loss.

Typical AIFF uses: Apple audio editing, high-quality source files.

About the SPX format

SPX is a audio format. Speex audio.

• Compression: lossy
• Opens with: VLC, Audacity, FFmpeg

Where SPX is strong: open, royalty-free codec tuned for speech; very small files for voice; low latency for real-time use.

Typical SPX uses: voice over IP and recordings, spoken-word archives, low-bandwidth speech.

What SPX keeps

• SPX adds: open, royalty-free codec tuned for speech.

Things to watch out for

• Keep your original AIFF if you may need to re-edit or re-export later — repeated lossy saves accumulate quality loss.
• One SPX limitation to keep in mind: poor quality for music.

When to convert AIFF to SPX

• Convert AIFF to SPX for voice over IP and recordings.
• Convert AIFF to SPX for spoken-word archives.
• Convert AIFF to SPX for low-bandwidth speech.

AIFF vs SPX — format comparison

A quick side-by-side of the structural differences between AIFF and SPX, so you can confirm this is the right conversion for your file:

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