MP3 vs WAV vs FLAC vs M4A: Which Audio Format Should You Use?
6 min read · June 2026
You extract the audio from a video, or go to convert a song, and you are faced with a dropdown: MP3, M4A, WAV, FLAC, OGG, OPUS. They all play sound, so does it matter which you pick? It does — but not in the "which is best" way people expect. The right format depends entirely on what you are going to do with the file next.
Here is what each one is actually good at, in plain language.
The one concept that explains everything: lossy vs lossless
Lossy formats (MP3, M4A, OGG, OPUS) make files small by throwing away audio detail your ears are least likely to notice. The saving is enormous — a lossy file is roughly a tenth the size of the original — and at a decent quality setting most people cannot hear the difference. The catch is that the discarded detail is gone for good, and re-encoding a lossy file into another lossy format loses a little more each time.
Lossless formats (WAV, FLAC) keep every bit of the original audio. WAV stores it uncompressed; FLAC compresses it the way a ZIP file does — smaller, but with nothing thrown away. The files are much larger, but the audio is a perfect copy, which matters when you are going to edit it.
The formats, one by one
- MP3 — the universal default. Lossy, small, and plays on literally everything: phones, cars, browsers, old players. If you just want to listen or share and are not sure, choose MP3.
- M4A (AAC) — a more modern lossy format that sounds slightly better than MP3 at the same size. Native on Apple devices and widely supported elsewhere. A good pick for compact, good-quality audio.
- WAV — uncompressed and lossless. Big files, but perfect quality and accepted by every audio editor. Use it as a source for editing.
- FLAC — lossless like WAV but roughly half the size. Ideal for archiving music you want to keep at full quality without the bulk of WAV.
- OGG & OPUS — open, royalty-free lossy formats. OPUS in particular is outstanding at low bitrates, which makes it perfect for voice notes, podcasts, and web audio where small size matters.
So which should you pick?
- Listening on a phone, car, or sharing with anyone — MP3.
- You are an Apple user or want a smaller file than MP3 at the same quality — M4A.
- You will edit the audio in software — WAV (or FLAC) so you start from a clean source.
- Archiving music at full quality without huge files — FLAC.
- Voice notes, podcasts, or audio for a website — OPUS or OGG.
A word on bitrate
For lossy formats you also choose a bitrate, which controls how much detail is kept. For speech — lectures, interviews, meetings — 96 to 128 kbps is plenty and keeps files tiny. For music you want to enjoy, 256 to 320 kbps preserves the detail. Choosing a bitrate higher than the source can offer does not help: extracting audio that was recorded at low quality will not improve at 320 kbps, it just makes a bigger file. When unsure, 192 kbps is a sensible all-rounder. (WAV and FLAC ignore bitrate entirely — they keep everything.)
Converting between them
You can move between any of these with the Audio Converter, or pull audio out of a video with Video to Audio. One rule worth remembering: always convert from the highest-quality source you have. Going from FLAC to MP3 is fine; going from a low-bitrate MP3 to WAV just wraps the already-lost detail in a bigger file — it cannot bring quality back.
There is no single "best" audio format — only the best one for what you are doing. Match the format to the destination: MP3 to share, WAV or FLAC to edit and archive, OPUS for the web, and you will never have to think about it again.