MP3 vs WAV: what's the difference and which should you use?

You’re exporting a song, archiving recordings, sending a voice-over to a client or filling up a USB stick for the car: MP3 or WAV? The answer depends less on “quality” in the abstract than on what you’ll do with the file next. Here’s what really separates the two formats, how much space each takes, and a simple rule for choosing — plus where FLAC, AAC and the others fit.

The one-sentence difference

WAV stores audio uncompressed, exactly as recorded. MP3 compresses it by discarding sounds the human ear is unlikely to perceive, making files several times smaller.

How each format works

WAV: the raw recording

WAV (Waveform Audio File Format) usually holds PCM audio: a list of amplitude measurements taken thousands of times per second. “CD quality” means 44,100 samples per second, 16 bits each, in stereo — 1,411 kbps. Studio recordings often use 24-bit and 48 kHz or more.

Nothing is thrown away, so you can edit, process and re-save a WAV as many times as you like without degradation. The cost is size. WAV files also have a 4 GB limit in their standard form, and limited support for tags like artist and cover art.

MP3: perceptual compression

MP3 uses a psychoacoustic model: it removes frequencies masked by louder sounds and detail beyond what most ears can hear, then compresses what remains. The bitrate (128, 192, 256, 320 kbps…) sets how much data is kept per second. Higher bitrate, better fidelity, bigger file.

The loss is permanent, and it accumulates: decoding an MP3, editing it and encoding it again degrades it a little more each time.

File sizes compared

Per minute of stereo audio:

The WAV and MP3 figures follow directly from the bitrate (bitrate × 60 seconds ÷ 8). FLAC depends on the music: dense rock compresses less than solo piano.

Can you hear the difference?

At 128 kbps, attentive listeners on good headphones can often notice slightly “swishy” cymbals, smeared reverb tails or less precise stereo. At 256–320 kbps, the difference with a WAV is extremely hard to detect for most people in blind listening, especially on phone speakers, car stereos or Bluetooth earbuds (which compress audio themselves anyway).

So for listening, a high-bitrate MP3 is effectively transparent for most people. For working on audio, WAV is the right choice — not because you’d hear the difference in one playback, but because losses add up with every edit and export.

When to use WAV

• Recording voice, instruments, podcasts: record in WAV (24-bit if your interface allows).
• Editing and mixing in a DAW (Audacity, GarageBand, Logic, Reaper…).
• Masters you deliver to a mastering engineer, a label or a distributor — most ask for WAV.
• Broadcasting and video post-production, where WAV at 48 kHz is the norm.
• Software that requires it: some transcription, sampling or CD-burning tools.

When to use MP3

• Sharing with anyone, on any device — MP3 plays everywhere, from old car stereos to smart speakers.
• Email and messaging, where file size limits apply.
• Podcasts for distribution (128–192 kbps is standard for speech).
• Music libraries on phones and USB sticks where space matters.

To convert: WAV to MP3 (choose 128 to 320 kbps; AIFF is accepted too). Going the other way for an editor that needs WAV: MP3 to WAV. Both run in your browser without uploading your recordings.

What about FLAC, AAC, OGG and Opus?

Audio Converter converts between MP3, WAV, M4A (AAC), OGG, FLAC and OPUS. For specific cases: FLAC to MP3, M4A to MP3, OGG to MP3.

Smart workflow: keep a lossless master

The approach professionals use, and that works for anyone:

1. Record and edit in WAV (or keep your FLAC library).
2. Export MP3 copies for sharing, at a bitrate that fits the use.
3. Never convert MP3 → WAV → MP3 hoping to improve something: each lossy encode loses a bit more.
4. Back up the masters. Storage is cheap; a lost original isn’t recoverable from an MP3.

A note on sample rate and bit depth

When exporting a WAV, your software asks for a sample rate and a bit depth:

• 44.1 kHz is the music and CD standard; 48 kHz is the standard for video. Match what the destination expects, and avoid converting back and forth between them.
• 16-bit is enough for a finished track; 24-bit gives more headroom while recording and mixing, so quiet passages stay clean when you raise the volume.
• Higher values (96 kHz, 32-bit float) are useful in studios but make files much larger for little audible benefit in a final product.

Quick decision guide

Common questions about converting

Will WAV to MP3 make my music sound worse? At 256–320 kbps, almost certainly not audibly. At 128 kbps, possibly for music on good equipment — fine for speech.

Which bitrate for a voice memo? 128 kbps is plenty; voice doesn’t benefit from more.

My WAV is 2 GB — is that normal? A multi-hour 24-bit recording can be. Cut out the parts you need with Trim Audio or export an MP3 for listening.

Need the audio track from a video? See how to extract audio from a video.