Audio file formats explained

Quick choice

• Use MP3 when you need a smaller file that works almost everywhere.
• Use WAV when you plan to edit, mix, or keep an uncompressed working copy.
• Use FLAC when you want lossless audio but a smaller archive than WAV.
• Use M4A or AAC when the file comes from phones, voice memos, or Apple-oriented workflows.
• Use OGG or OPUS when you are working with web audio, voice, or open media workflows.

What each format is good for

WAV

WAV is usually uncompressed PCM audio. It is large, but simple and predictable. Many editors, music tools, and practice-room workflows accept WAV without extra setup. If you are recording a lesson, preparing a backing track, or saving an original source, WAV is a comfortable working format.

MP3

MP3 removes audio information that is less noticeable to listeners, which makes the file much smaller. It is ideal for sharing, uploading, sending by email, and playing on older devices. The trade-off is that repeated MP3 exports can slowly reduce quality, so keep a higher-quality original when possible.

M4A and AAC

M4A is a container often used with AAC audio. It is common in phone recordings and voice memos. AAC can sound good at lower bitrates, but some older tools expect MP3 instead. Converting M4A to MP3 is useful when a platform rejects the original file.

FLAC

FLAC is lossless compression. It keeps the audio data while reducing file size compared with WAV. It is excellent for archiving music or important source material, but MP3 is still easier when you need broad compatibility.

OGG and OPUS

OGG is a container and OPUS is a modern codec that performs especially well for speech and streaming. They are useful on the web, but some apps and upload forms still prefer MP3. Converting OGG or OPUS to MP3 can make the file easier to reuse.

A practical workflow

A simple rule is to keep one high-quality source and create smaller delivery files from that source. For example, keep a WAV or FLAC copy for editing, then export MP3 for sharing. If you receive phone recordings as M4A, convert them to MP3 only when the destination requires it. For batch work, process a few files at a time and check the result before deleting originals.