AIFF to OPUS Converter

Convert AIFF to Opus Online

AIFF stores audio as uncompressed PCM, so a CD-quality track runs about 10 MB per minute — too large to embed on a web page or drop into a Discord chat. Opus is a modern, royalty-free codec (IETF RFC 6716) that reaches near-transparent quality at roughly half the bitrate of MP3, so the same minute of audio lands near 1 MB at 128 kbps. Encoding Opus straight from a lossless AIFF master is exactly how Opus is meant to be made: one clean generation from the original PCM, with no stacked re-compressions degrading the sound.

How to Convert AIFF to Opus

1. Upload Your AIFF File: Drag and drop your .aiff or .aif file onto the page, or click "+ Add Files" to browse. You can queue several files and convert them in one batch.
2. Pick a Quality Preset or Bitrate: Open Advanced Options. Leave Quality Preset on a high setting for the cleanest result, or switch to Custom Bitrate and type a value — 96–128 kbps is the range Xiph recommends for transparent music storage. You can also choose Variable Bitrate (efficient, recommended for music) or Constant Bitrate if a fixed rate is required.
3. Set Sample Rate, Channel, or Trim (Optional): Leave Audio Sample Rate and Audio Channel on "Original" to match the source, or change them to resample or downmix. Use Trim to export only part of the track, or Specific file size to target an exact output size.
4. Convert and Download: Click "Convert" and download your .opus file. No sign-up, no watermark.

AIFF vs Opus at a Glance

Frequently Asked Questions

Will I lose audio quality converting AIFF to Opus?

Some, but it is the right kind of loss. AIFF is lossless and Opus is lossy, so the encoder permanently discards data your ears are least likely to miss — that is what makes the file so much smaller. The key is that you are encoding directly from the lossless AIFF master, a single clean generation rather than a transcode of an already-compressed file, so Opus performs at its best. At 96–128 kbps it is near-transparent for most music. Keep the original AIFF as your archival master and use the Opus copy for distribution and casual listening.

What bitrate should I choose for Opus?

For general music, 96–128 kbps in Variable Bitrate mode is the sweet spot — Xiph, the codec's maintainer, considers 128 kbps VBR "pretty much transparent" for stereo music. Voice, podcasts, and audiobooks sound clean far lower, around 24–48 kbps. Go to 160 kbps or higher only if you are encoding dense, complex material (heavy applause, harpsichord, layered electronic music) where you can actually hear a difference. There is rarely a reason to exceed 192 kbps for stereo.

How much smaller will the Opus file be than the AIFF?

A large reduction. Uncompressed CD-quality AIFF is roughly 10 MB per minute, while Opus at 128 kbps is roughly 1 MB per minute — about a tenth of the size. In our testing, a 4-minute 16-bit/44.1 kHz stereo track that was about 42 MB as AIFF came down to roughly 3.9 MB as Opus at 128 kbps VBR. Lower bitrates shrink it further; the Specific file size option lets you target an exact size instead.

Can I play Opus files everywhere, including on Apple devices?

Opus plays natively in Chrome, Firefox, Edge, VLC, foobar2000, Android, and most modern browsers and media players. Apple support is the weak spot: older versions of iTunes and iOS do not handle .opus reliably, though support has improved on recent systems. If you need a file that opens anywhere with no fuss, convert to AIFF to MP3 instead. To keep a lossless copy for archiving, use AIFF to FLAC.

Are my uploaded files kept private?

Files are uploaded over an encrypted connection, processed on our servers, and deleted automatically a few hours after conversion — no sign-up, no watermark, never shared or made public.